Delete unsupported parameter for Grok Code Fast 1 (#980)

https://kilo-code.slack.com/archives/C0A509PREAU/p1773143363588879

https://kilo-code.slack.com/archives/C08TXA9QAGP/p1773141976913499

Author: chrarnoldus

src/lib/providers/index.ts

@@ -266,7 +266,7 @@ export function applyProviderSpecificLogic(
   applyPreferredProvider(requestedModel, requestToMutate);
 
   if (isXaiModel(requestedModel)) {
-    applyXaiModelSettings(requestToMutate, extraHeaders);
+    applyXaiModelSettings(requestedModel, requestToMutate, extraHeaders);
   }
 
   if (isGeminiModel(requestedModel)) {

src/lib/providers/xai.ts

@@ -44,9 +44,14 @@ export function convertReasoningDetailsToReasoningContent(
 }
 
 export function applyXaiModelSettings(
+  requestedModel: string,
   requestToMutate: OpenRouterChatCompletionRequest,
   extraHeaders: Record<string, string>
 ) {
+  if (requestedModel === grok_code_fast_1_optimized_free_model.public_id) {
+    delete requestToMutate.reasoning;
+  }
+
   // https://kilo-code.slack.com/archives/C09922UFQHF/p1767968746782459
   extraHeaders['x-grok-conv-id'] = requestToMutate.prompt_cache_key || crypto.randomUUID();
   extraHeaders['x-grok-req-id'] = crypto.randomUUID();