fix(opencode): use official ai-gateway-provider package for Cloudflare AI Gateway

packages/opencode/package.json

@@ -92,6 +92,7 @@
     "@standard-schema/spec": "1.0.0",
     "@zip.js/zip.js": "2.7.62",
     "ai": "catalog:",
+    "ai-gateway-provider": "2.3.1",
     "bonjour-service": "1.3.0",
     "bun-pty": "0.4.4",
     "chokidar": "4.0.3",

packages/opencode/src/provider/provider.ts

@@ -461,52 +461,36 @@ export namespace Provider {
 
       if (!accountId || !gateway) return { autoload: false }
 
-      // Get API token from env or auth prompt
+      // Get API token from env or auth - required for authenticated gateways
       const apiToken = await (async () => {
-        const envToken = Env.get("CLOUDFLARE_API_TOKEN")
+        const envToken = Env.get("CLOUDFLARE_API_TOKEN") || Env.get("CF_AIG_TOKEN")
         if (envToken) return envToken
         const auth = await Auth.get(input.id)
         if (auth?.type === "api") return auth.key
         return undefined
       })()
 
+      if (!apiToken) {
+        throw new Error(
+          "CLOUDFLARE_API_TOKEN (or CF_AIG_TOKEN) is required for Cloudflare AI Gateway. " +
+            "Set it via environment variable or run `opencode auth cloudflare-ai-gateway`.",
+        )
+      }
+
+      // Use official ai-gateway-provider package (v2.x for AI SDK v5 compatibility)
+      const { createAiGateway } = await import("ai-gateway-provider")
+      const { createUnified } = await import("ai-gateway-provider/providers/unified")
+
+      const aigateway = createAiGateway({ accountId, gateway, apiKey: apiToken })
+      const unified = createUnified()
+
       return {
         autoload: true,
-        async getModel(sdk: any, modelID: string, _options?: Record<string, any>) {
-          return sdk.languageModel(modelID)
-        },
-        options: {
-          baseURL: `https://gateway.ai.cloudflare.com/v1/${accountId}/${gateway}/compat`,
-          headers: {
-            // Cloudflare AI Gateway uses cf-aig-authorization for authenticated gateways
-            // This enables Unified Billing where Cloudflare handles upstream provider auth
-            ...(apiToken ? { "cf-aig-authorization": `Bearer ${apiToken}` } : {}),
-            "HTTP-Referer": "https://opencode.ai/",
-            "X-Title": "opencode",
-          },
-          // Custom fetch to handle parameter transformation and auth
-          fetch: async (input: RequestInfo | URL, init?: RequestInit) => {
-            const headers = new Headers(init?.headers)
-            // Strip Authorization header - AI Gateway uses cf-aig-authorization instead
-            headers.delete("Authorization")
-
-            // Transform max_tokens to max_completion_tokens for newer models
-            if (init?.body && init.method === "POST") {
-              try {
-                const body = JSON.parse(init.body as string)
-                if (body.max_tokens !== undefined && !body.max_completion_tokens) {
-                  body.max_completion_tokens = body.max_tokens
-                  delete body.max_tokens
-                  init = { ...init, body: JSON.stringify(body) }
-                }
-              } catch (e) {
-                // If body parsing fails, continue with original request
-              }
-            }
-
-            return fetch(input, { ...init, headers })
-          },
+        async getModel(_sdk: any, modelID: string, _options?: Record<string, any>) {
+          // Model IDs use Unified API format: provider/model (e.g., "anthropic/claude-sonnet-4-5")
+          return aigateway(unified(modelID))
         },
+        options: {},
       }
     },
     cerebras: async () => {