fix(ai-gateway): exclude Laguna from Vercel routing (#4918)

* fix(ai-gateway): exclude Laguna from Vercel routing

* fix(ai-gateway): broaden Laguna routing exclusion

Author: chrarnoldus

apps/web/src/lib/ai-gateway/providers/vercel/index.ts

@@ -95,6 +95,11 @@ export async function shouldRouteToVercel(
   request: GatewayRequest,
   randomSeed: string
 ) {
+  // BYOK in the Vercel AI Gateway was not working for Laguna models.
+  if (requestedModel.includes('laguna')) {
+    return false;
+  }
+
   if (isOpenRouterGpt56PromoModel(requestedModel)) {
     console.debug(
       `[shouldRouteToVercel] routing ${requestedModel} to OpenRouter for the GPT-5.6 promotion`