diff --git a/ai-logic/firebase-ai/CHANGELOG.md b/ai-logic/firebase-ai/CHANGELOG.md
index ad7be4a8513..cb69d77093c 100644
--- a/ai-logic/firebase-ai/CHANGELOG.md
+++ b/ai-logic/firebase-ai/CHANGELOG.md
@@ -1,9 +1,11 @@
 # Unreleased
 
+- [deprecated] All Imagen models are deprecated and will shut down as early as June 2026.
+  As a replacement, you can [migrate your apps to use Gemini Image models (the "Nano Banana" models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration).
 - [feature] Added support for Chat interactions using server prompt templates (#7986)
 - [fixed] Fixed an issue causing network timeouts to throw the incorrect exception type, instead of
   `RequestTimeoutException` (#7966)
-- [fixed] Fixed missing `toString()` implemenation for `InferenceSource` (#7970)
+- [fixed] Fixed missing `toString()` implementation for `InferenceSource` (#7970)
 - [fixed] Fixed an issue causing the SDK to throw an exception if an unknown message was received
   from the LiveAPI model, instead of ignoring it (#7975)
 
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/ImagenModel.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/ImagenModel.kt
index c562ea0233b..d16a528fb49 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/ImagenModel.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/ImagenModel.kt
@@ -44,7 +44,12 @@ import com.google.firebase.auth.internal.InternalAuthProvider
  *
  * See the documentation for a list of
  * [supported models](https://firebase.google.com/docs/ai-logic/models).
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenModel
 internal constructor(
   private val modelName: String,
@@ -86,7 +91,12 @@ internal constructor(
    * Generates an image, returning the result directly to the caller.
    *
    * @param prompt The input(s) given to the model as a prompt.
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   public suspend fun generateImages(prompt: String): ImagenGenerationResponse<ImagenInlineImage> =
     try {
       controller
@@ -104,7 +114,12 @@ internal constructor(
    * @param referenceImages the image inputs given to the model as a prompt
    * @param prompt the text input given to the model as a prompt
    * @param config the editing configuration settings
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   @PublicPreviewAPI
   public suspend fun editImage(
     referenceImages: List<ImagenReferenceImage>,
@@ -129,7 +144,12 @@ internal constructor(
    * @param prompt the text input given to the model as a prompt
    * @param mask the mask which defines where in the image can be painted by Imagen.
    * @param config the editing configuration settings, it should include an [ImagenEditMode]
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   @PublicPreviewAPI
   public suspend fun inpaintImage(
     image: ImagenInlineImage,
@@ -154,7 +174,12 @@ internal constructor(
    * insufficient
    * @param config the editing configuration settings
    * @see [ImagenMaskReference.generateMaskAndPadForOutpainting]
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   @PublicPreviewAPI
   public suspend fun outpaintImage(
     image: ImagenInlineImage,
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/java/ImagenModelFutures.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/java/ImagenModelFutures.kt
index 2f0299da406..ccbc7b8d8f2 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/java/ImagenModelFutures.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/java/ImagenModelFutures.kt
@@ -33,14 +33,24 @@ import com.google.firebase.ai.type.PublicPreviewAPI
  * Wrapper class providing Java compatible methods for [ImagenModel].
  *
  * @see [ImagenModel]
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public abstract class ImagenModelFutures internal constructor() {
   /**
    * Generates an image, returning the result directly to the caller.
    *
    * @param prompt The main text prompt from which the image is generated.
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   public abstract fun generateImages(
     prompt: String,
   ): ListenableFuture<ImagenGenerationResponse<ImagenInlineImage>>
@@ -52,7 +62,12 @@ public abstract class ImagenModelFutures internal constructor() {
    * @param prompt the text input given to the model as a prompt
    * @param referenceImages the image inputs given to the model as a prompt
    * @param config the editing configuration settings
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   public abstract fun editImage(
     referenceImages: List<ImagenReferenceImage>,
     prompt: String,
@@ -65,7 +80,12 @@ public abstract class ImagenModelFutures internal constructor() {
    *
    * @param prompt the text input given to the model as a prompt
    * @param referenceImages the image inputs given to the model as a prompt
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   public abstract fun editImage(
     referenceImages: List<ImagenReferenceImage>,
     prompt: String,
@@ -78,7 +98,12 @@ public abstract class ImagenModelFutures internal constructor() {
    * @param prompt the text input given to the model as a prompt
    * @param mask the mask which defines where in the image can be painted by imagen.
    * @param config the editing configuration settings, it should include an [ImagenEditMode]
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   public abstract fun inpaintImage(
     image: ImagenInlineImage,
     prompt: String,
@@ -99,7 +124,12 @@ public abstract class ImagenModelFutures internal constructor() {
    * insufficient
    * @param config the editing configuration settings
    * @see [ImagenMaskReference.generateMaskAndPadForOutpainting]
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   public abstract fun outpaintImage(
     image: ImagenInlineImage,
     newDimensions: Dimensions,
@@ -108,8 +138,14 @@ public abstract class ImagenModelFutures internal constructor() {
     config: ImagenEditingConfig? = null,
   ): ListenableFuture<ImagenGenerationResponse<ImagenInlineImage>>
 
-  /** Returns the [ImagenModel] object wrapped by this object. */
-  public abstract fun getImageModel(): ImagenModel
+  /**
+   * Returns the [ImagenModel] object wrapped by this object.
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+   */
+  @Deprecated("All Imagen models are deprecated.") public abstract fun getImageModel(): ImagenModel
 
   private class FuturesImpl(private val model: ImagenModel) : ImagenModelFutures() {
     override fun generateImages(
@@ -154,7 +190,15 @@ public abstract class ImagenModelFutures internal constructor() {
 
   public companion object {
 
-    /** @return a [ImagenModelFutures] created around the provided [ImagenModel] */
-    @JvmStatic public fun from(model: ImagenModel): ImagenModelFutures = FuturesImpl(model)
+    /**
+     * @return a [ImagenModelFutures] created around the provided [ImagenModel]
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+     */
+    @Deprecated("All Imagen models are deprecated.")
+    @JvmStatic
+    public fun from(model: ImagenModel): ImagenModelFutures = FuturesImpl(model)
   }
 }
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenAspectRatio.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenAspectRatio.kt
index a5d5e22fca3..f67896a11c8 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenAspectRatio.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenAspectRatio.kt
@@ -16,7 +16,14 @@
 
 package com.google.firebase.ai.type
 
-/** Represents the aspect ratio that the generated image should conform to. */
+/**
+ * Represents the aspect ratio that the generated image should conform to.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+ */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenAspectRatio private constructor(internal val internalVal: String) {
   public companion object {
     /** A square image, useful for icons, profile pictures, etc. */
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenControlType.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenControlType.kt
index 6d0bf1a98ab..a770e6e84ff 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenControlType.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenControlType.kt
@@ -15,7 +15,14 @@
  */
 package com.google.firebase.ai.type
 
-/** Represents a control type for controlled Imagen generation/editing */
+/**
+ * Represents a control type for controlled Imagen generation/editing
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+ */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenControlType internal constructor(internal val value: String) {
   public companion object {
 
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenEditMode.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenEditMode.kt
index 6be2b44baab..b80ab24565d 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenEditMode.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenEditMode.kt
@@ -15,7 +15,14 @@
  */
 package com.google.firebase.ai.type
 
-/** Represents the edit mode for Imagen */
+/**
+ * Represents the edit mode for Imagen
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+ */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenEditMode private constructor(internal val value: String) {
 
   public companion object {
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenEditingConfig.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenEditingConfig.kt
index 60e54261c1e..eeb35ea4c54 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenEditingConfig.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenEditingConfig.kt
@@ -21,7 +21,12 @@ import kotlinx.serialization.Serializable
  * Contains the editing settings which are not specific to a reference image
  * @param editMode holds the editing mode if the request is for inpainting or outpainting
  * @param editSteps the number of intermediate steps to include in the editing process
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public class ImagenEditingConfig(
   internal val editMode: ImagenEditMode? = null,
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenGenerationConfig.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenGenerationConfig.kt
index 1b4407a12a6..db00a0ed383 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenGenerationConfig.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenGenerationConfig.kt
@@ -25,9 +25,14 @@ package com.google.firebase.ai.type
  * @param aspectRatio The aspect ratio of the generated images.
  * @param imageFormat The file format/compression of the generated images.
  * @param addWatermark Adds an invisible watermark to mark the image as AI generated.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
 import kotlin.jvm.JvmField
 
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenGenerationConfig(
   public val negativePrompt: String? = null,
   public val numberOfImages: Int? = 1,
@@ -40,7 +45,12 @@ public class ImagenGenerationConfig(
    *
    * This is mainly intended for Java interop. For Kotlin, use [imagenGenerationConfig] for a more
    * idiomatic experience.
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   public class Builder {
     @JvmField public var negativePrompt: String? = null
     @JvmField public var numberOfImages: Int? = 1
@@ -48,27 +58,62 @@ public class ImagenGenerationConfig(
     @JvmField public var imageFormat: ImagenImageFormat? = null
     @JvmField public var addWatermark: Boolean? = null
 
-    /** See [ImagenGenerationConfig.negativePrompt]. */
+    /**
+     * See [ImagenGenerationConfig.negativePrompt].
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+     */
+    @Deprecated("All Imagen models are deprecated.")
     public fun setNegativePrompt(negativePrompt: String): Builder = apply {
       this.negativePrompt = negativePrompt
     }
 
-    /** See [ImagenGenerationConfig.numberOfImages]. */
+    /**
+     * See [ImagenGenerationConfig.numberOfImages].
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+     */
+    @Deprecated("All Imagen models are deprecated.")
     public fun setNumberOfImages(numberOfImages: Int): Builder = apply {
       this.numberOfImages = numberOfImages
     }
 
-    /** See [ImagenGenerationConfig.aspectRatio]. */
+    /**
+     * See [ImagenGenerationConfig.aspectRatio].
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+     */
+    @Deprecated("All Imagen models are deprecated.")
     public fun setAspectRatio(aspectRatio: ImagenAspectRatio): Builder = apply {
       this.aspectRatio = aspectRatio
     }
 
-    /** See [ImagenGenerationConfig.imageFormat]. */
+    /**
+     * See [ImagenGenerationConfig.imageFormat].
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+     */
+    @Deprecated("All Imagen models are deprecated.")
     public fun setImageFormat(imageFormat: ImagenImageFormat): Builder = apply {
       this.imageFormat = imageFormat
     }
 
-    /** See [ImagenGenerationConfig.addWatermark]. */
+    /**
+     * See [ImagenGenerationConfig.addWatermark].
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+     */
+    @Deprecated("All Imagen models are deprecated.")
     public fun setAddWatermark(addWatermark: Boolean): Builder = apply {
       this.addWatermark = addWatermark
     }
@@ -78,7 +123,12 @@ public class ImagenGenerationConfig(
      * ```
      * val config = GenerationConfig.builder()
      * ```
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
      */
+    @Deprecated("All Imagen models are deprecated.")
     public fun build(): ImagenGenerationConfig =
       ImagenGenerationConfig(
         negativePrompt = negativePrompt,
@@ -107,7 +157,12 @@ public class ImagenGenerationConfig(
  *   addWatermark = false
  * }
  * ```
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 public fun imagenGenerationConfig(
   init: ImagenGenerationConfig.Builder.() -> Unit
 ): ImagenGenerationConfig {
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenGenerationResponse.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenGenerationResponse.kt
index f8956eafab2..4dbd9c19972 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenGenerationResponse.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenGenerationResponse.kt
@@ -26,7 +26,12 @@ import kotlinx.serialization.Serializable
  * @param images contains the generated images
  * @param filteredReason if fewer images were generated than were requested, this field will contain
  * the reason they were filtered out.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenGenerationResponse<T>
 internal constructor(public val images: List<T>, public val filteredReason: String?) {
 
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenImageFormat.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenImageFormat.kt
index f9bfc40575c..250c4b56b3b 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenImageFormat.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenImageFormat.kt
@@ -25,7 +25,12 @@ import kotlinx.serialization.Serializable
  * @param compressionQuality an int (1-100) representing the quality of the image; a lower number
  * means the image is permitted to be lower quality to reduce size. This parameter is not relevant
  * for every MIME type.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenImageFormat
 private constructor(public val mimeType: String, public val compressionQuality: Int?) {
 
@@ -39,13 +44,25 @@ private constructor(public val mimeType: String, public val compressionQuality:
      *
      * @param compressionQuality an int (1-100) representing the quality of the image; a lower
      * number means the image is permitted to be lower quality to reduce size.
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
      */
+    @Deprecated("All Imagen models are deprecated.")
     @JvmStatic
     public fun jpeg(compressionQuality: Int? = null): ImagenImageFormat {
       return ImagenImageFormat("image/jpeg", compressionQuality)
     }
 
-    /** An [ImagenImageFormat] representing a PNG image */
+    /**
+     * An [ImagenImageFormat] representing a PNG image
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+     */
+    @Deprecated("All Imagen models are deprecated.")
     @JvmStatic
     public fun png(): ImagenImageFormat {
       return ImagenImageFormat("image/png", null)
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenImagePlacement.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenImagePlacement.kt
index db003a15344..65d373743b3 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenImagePlacement.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenImagePlacement.kt
@@ -18,7 +18,12 @@ package com.google.firebase.ai.type
 /**
  * Represents where the placement of an image is within a new, larger image, usually in the context
  * of an outpainting request.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenImagePlacement
 private constructor(public val x: Int? = null, public val y: Int? = null) {
 
@@ -72,7 +77,12 @@ private constructor(public val x: Int? = null, public val y: Int? = null) {
      * coordinates represent the location of the top left corner of the original image.
      * @param x the x coordinate of the top left corner of the original image
      * @param y the y coordinate of the top left corner of the original image
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
      */
+    @Deprecated("All Imagen models are deprecated.")
     @JvmStatic
     public fun fromCoordinate(x: Int, y: Int): ImagenImagePlacement {
       return ImagenImagePlacement(x, y)
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenInlineImage.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenInlineImage.kt
index ccf084d6aa7..bc751c83474 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenInlineImage.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenInlineImage.kt
@@ -28,7 +28,12 @@ import kotlinx.serialization.Serializable
  * @property data The raw image bytes in JPEG or PNG format, as specified by [mimeType].
  * @property mimeType The IANA standard MIME type of the image data; either `"image/png"` or
  * `"image/jpeg"`; to request a different format, see [ImagenGenerationConfig.imageFormat].
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenInlineImage
 internal constructor(
   public val data: ByteArray,
@@ -37,7 +42,12 @@ internal constructor(
 
   /**
    * Returns the image as an Android OS native [Bitmap] so that it can be saved or sent to the UI.
+   *
+   * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+   * early as June 2026. As a replacement, you can
+   * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
    */
+  @Deprecated("All Imagen models are deprecated.")
   public fun asBitmap(): Bitmap {
     return BitmapFactory.decodeByteArray(data, 0, data.size)
   }
@@ -50,6 +60,14 @@ internal constructor(
   }
 }
 
+/**
+ * Helper method to convert an Android bitmap to an Imagen inline data image.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+ */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public fun Bitmap.toImagenInlineImage(): ImagenInlineImage {
   val byteArrayOutputStream = ByteArrayOutputStream()
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenPersonFilterLevel.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenPersonFilterLevel.kt
index baecec0cfb4..122dbd247e5 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenPersonFilterLevel.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenPersonFilterLevel.kt
@@ -16,7 +16,14 @@
 
 package com.google.firebase.ai.type
 
-/** A filter used to prevent images from containing depictions of children or people. */
+/**
+ * A filter used to prevent images from containing depictions of children or people.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+ */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenPersonFilterLevel private constructor(internal val internalVal: String) {
   public companion object {
     /**
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenReferenceImage.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenReferenceImage.kt
index 59eb927e687..1bbd64c47e6 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenReferenceImage.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenReferenceImage.kt
@@ -23,7 +23,14 @@ import android.graphics.Rect
 import com.google.firebase.ai.common.GenerateImageRequest
 import kotlinx.serialization.Serializable
 
-/** Represents an reference image for an Imagen editing request */
+/**
+ * Represents an reference image for an Imagen editing request
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+ */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public abstract class ImagenReferenceImage
 internal constructor(
@@ -85,7 +92,12 @@ internal constructor(
  * the generated referenced image
  * @param superpixelRuler if type is [ImagenControlType.COLOR_SUPERPIXEL] and [enableComputation] is
  * true, this will control the superpixel smoothness factor for the generated referenced image
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public class ImagenControlReference(
   type: ImagenControlType,
@@ -105,7 +117,12 @@ public class ImagenControlReference(
 /**
  * Represents a mask for Imagen editing. This image (generated or provided) should contain only
  * black and white pixels, with black representing parts of the image which should not change.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public abstract class ImagenMaskReference
 internal constructor(maskConfig: ImagenMaskConfig, image: ImagenInlineImage? = null) :
@@ -124,7 +141,12 @@ internal constructor(maskConfig: ImagenMaskConfig, image: ImagenInlineImage? = n
      * @param newDimensions the new dimensions for outpainting. These new dimensions *must* be more
      * than the original image.
      * @param newPosition the placement of the original image within the new outpainted image.
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
      */
+    @Deprecated("All Imagen models are deprecated.")
     @JvmOverloads
     @JvmStatic
     public fun generateMaskAndPadForOutpainting(
@@ -147,7 +169,12 @@ internal constructor(maskConfig: ImagenMaskConfig, image: ImagenInlineImage? = n
      * than the original image.
      * @param newPosition the placement of the original image within the new outpainted image.
      * @param dilation the dilation for the outpainting mask. See: [ImagenRawMask].
+     *
+     * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as
+     * early as June 2026. As a replacement, you can
+     * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
      */
+    @Deprecated("All Imagen models are deprecated.")
     @JvmStatic
     public fun generateMaskAndPadForOutpainting(
       image: ImagenInlineImage,
@@ -214,7 +241,12 @@ internal constructor(maskConfig: ImagenMaskConfig, image: ImagenInlineImage? = n
  * white, and the foreground black
  * @param dilation the amount to dilate the mask. This can help smooth the borders of an edit and
  * make it seem more convincing. For example, `0.05` will dilate the mask 5%.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public class ImagenBackgroundMask(dilation: Double? = null) :
   ImagenMaskReference(maskConfig = ImagenMaskConfig(ImagenMaskMode.BACKGROUND, dilation)) {}
@@ -224,7 +256,12 @@ public class ImagenBackgroundMask(dilation: Double? = null) :
  * black, and the foreground white
  * @param dilation the amount to dilate the mask. This can help smooth the borders of an edit and
  * make it seem more convincing. For example, `0.05` will dilate the mask 5%.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public class ImagenForegroundMask(dilation: Double? = null) :
   ImagenMaskReference(maskConfig = ImagenMaskConfig(ImagenMaskMode.FOREGROUND, dilation)) {}
@@ -236,7 +273,12 @@ public class ImagenForegroundMask(dilation: Double? = null) :
  * @param mask the mask image
  * @param dilation the amount to dilate the mask. This can help smooth the borders of an edit and
  * make it seem more convincing. For example, `0.05` will dilate the mask 5%.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public class ImagenRawMask(mask: ImagenInlineImage, dilation: Double? = null) :
   ImagenMaskReference(
@@ -252,7 +294,12 @@ public class ImagenRawMask(mask: ImagenInlineImage, dilation: Double? = null) :
  * in the Vertex AI documentation.
  * @param dilation the amount to dilate the mask. This can help smooth the borders of an edit and
  * make it seem more convincing. For example, `0.05` will dilate the mask 5%.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public class ImagenSemanticMask(classes: List<Int>, dilation: Double? = null) :
   ImagenMaskReference(maskConfig = ImagenMaskConfig(ImagenMaskMode.SEMANTIC, dilation, classes)) {}
@@ -260,7 +307,12 @@ public class ImagenSemanticMask(classes: List<Int>, dilation: Double? = null) :
 /**
  * Represents a base image for Imagen editing
  * @param image the image
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public class ImagenRawImage(image: ImagenInlineImage) : ImagenReferenceImage(image = image) {}
 
@@ -269,7 +321,12 @@ public class ImagenRawImage(image: ImagenInlineImage) : ImagenReferenceImage(ima
  * @param image the image representing the style you want to transfer to your original images
  * @param referenceId the reference ID you can use to reference this style in your prompt
  * @param description the description you can use to reference this style in your prompt
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public class ImagenStyleReference(
   image: ImagenInlineImage,
@@ -288,7 +345,12 @@ public class ImagenStyleReference(
  * @param referenceId the reference ID you can use to reference this subject in your prompt
  * @param description the description you can use to reference this subject in your prompt
  * @param subjectType the type of the subject
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
+@Deprecated("All Imagen models are deprecated.")
 @PublicPreviewAPI
 public class ImagenSubjectReference(
   image: ImagenInlineImage,
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSafetyFilterLevel.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSafetyFilterLevel.kt
index 6ac34e96fd3..39ee932c3dd 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSafetyFilterLevel.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSafetyFilterLevel.kt
@@ -16,7 +16,14 @@
 
 package com.google.firebase.ai.type
 
-/** Used for safety filtering. */
+/**
+ * Used for safety filtering.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+ */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenSafetyFilterLevel private constructor(internal val internalVal: String) {
   public companion object {
     /** Strongest filtering level, most strict blocking. */
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSafetySettings.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSafetySettings.kt
index fe13234321f..89e0eea3bd0 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSafetySettings.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSafetySettings.kt
@@ -21,6 +21,10 @@ package com.google.firebase.ai.type
  *
  * @param safetyFilterLevel Used to filter unsafe content.
  * @param personFilterLevel Used to filter images containing people.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
  */
 public class ImagenSafetySettings(
   internal val safetyFilterLevel: ImagenSafetyFilterLevel,
diff --git a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSubjectReferenceType.kt b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSubjectReferenceType.kt
index dfe77f9adf5..b8b54f03f73 100644
--- a/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSubjectReferenceType.kt
+++ b/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/ImagenSubjectReferenceType.kt
@@ -15,7 +15,14 @@
  */
 package com.google.firebase.ai.type
 
-/** Represents a type for a subject reference, specifying how it should be interpreted. */
+/**
+ * Represents a type for a subject reference, specifying how it should be interpreted.
+ *
+ * @deprecated **Deprecation Notice:** All Imagen models are deprecated and will shut down as early
+ * as June 2026. As a replacement, you can
+ * [migrate your apps to use Gemini Image models (the 'Nano Banana' models)](https://firebase.google.com/docs/ai-logic/imagen-models-migration)
+ */
+@Deprecated("All Imagen models are deprecated.")
 public class ImagenSubjectReferenceType private constructor(internal val value: String) {
 
   public companion object {