diff --git a/packages/opencode/src/provider/transform.ts b/packages/opencode/src/provider/transform.ts
index c402238685..c1617da40b 100644
--- a/packages/opencode/src/provider/transform.ts
+++ b/packages/opencode/src/provider/transform.ts
@@ -936,6 +936,12 @@ export namespace ProviderTransform {
     }
 
     const key = sdkKey(model.api.npm) ?? model.providerID
+    // @ai-sdk/azure delegates to OpenAIChatLanguageModel which reads from
+    // providerOptions["openai"], but OpenAIResponsesLanguageModel checks
+    // "azure" first. Pass both so model options work on either code path.
+    if (model.api.npm === "@ai-sdk/azure") {
+      return { openai: options, azure: options }
+    }
     return { [key]: options }
   }