diff --git a/packages/core/src/generation.ts b/packages/core/src/generation.ts
index b48c98817d0..ba879ce1a23 100644
--- a/packages/core/src/generation.ts
+++ b/packages/core/src/generation.ts
@@ -1035,7 +1035,8 @@ async function handleOpenAI({
     mode,
     modelOptions,
 }: ProviderOptions): Promise<GenerateObjectResult<unknown>> {
-    const openai = createOpenAI({ apiKey });
+    const baseURL = models.openai.endpoint || undefined
+    const openai = createOpenAI({ apiKey, baseURL });
     return await aiGenerateObject({
         model: openai.languageModel(model),
         schema,