diff --git a/src/utils/ai.ts b/src/utils/ai.ts
index ca7dbbe..a7221e3 100644
--- a/src/utils/ai.ts
+++ b/src/utils/ai.ts
@@ -1,11 +1,8 @@
 import { createOpenAI } from '@ai-sdk/openai'
 
 const provider = createOpenAI({
-  baseURL: 'https://opencode.ai/zen/go/v1',
-  apiKey: process.env.OPENCODE_API_KEY,
-  // opencode go rejects requests without a session id (used for routing)
-  headers: { 'x-opencode-session': crypto.randomUUID() }
+  baseURL: 'https://openrouter.ai/api/v1',
+  apiKey: process.env.OPENROUTER_API_KEY
 })
 
-// zen's /responses endpoint is unreliable; .chat() forces /chat/completions
-export const chatModel = provider.chat('glm-5.3-flash')
+export const chatModel = provider.chat('z-ai/glm-5.3-flash')