diff --git a/packages/core/src/session/runner/to-llm-message.ts b/packages/core/src/session/runner/to-llm-message.ts
index b2b1af5d30f1..27fefd14bb07 100644
--- a/packages/core/src/session/runner/to-llm-message.ts
+++ b/packages/core/src/session/runner/to-llm-message.ts
@@ -79,7 +79,7 @@ const assistant = (message: SessionMessage.Assistant, model: Model) => {
             {
               type: "reasoning",
               text: item.text,
-              providerMetadata: reuseProviderMetadata ? item.providerMetadata : undefined,
+              providerMetadata: item.providerMetadata,
             },
           ]
         : item.text.length > 0
diff --git a/packages/core/test/session-runner-message.test.ts b/packages/core/test/session-runner-message.test.ts
index 5798b665a86a..912ad135e610 100644
--- a/packages/core/test/session-runner-message.test.ts
+++ b/packages/core/test/session-runner-message.test.ts
@@ -327,7 +327,7 @@ Recent work
     ])
   })
 
-  test("drops provider-native continuation metadata from failed assistant turns", () => {
+  test("drops provider-native continuation metadata from failed assistant turn tools, but preserves reasoning", () => {
     const messages = toLLMMessages(
       [
         SessionMessage.Assistant.make({
@@ -370,7 +370,11 @@ Recent work
     )
 
     expect(messages[0]?.content).toEqual([
-      { type: "reasoning", text: "Partial thought", providerMetadata: undefined },
+      {
+        type: "reasoning",
+        text: "Partial thought",
+        providerMetadata: { openai: { itemId: "rs_failed", reasoningEncryptedContent: null } },
+      },
       {
         type: "tool-call",
         id: "hosted-failed",