no forced redirect

src/proxy/google-ai.ts

@@ -208,8 +208,8 @@ function setStreamFlag(req: Request) {
 }
 
 /**
- * Replaces requests for non-Google AI models with gemini-1.5-pro-latest.
- * Also strips models/ from the beginning of the model IDs.
+ * Strips 'models/' prefix from the beginning of model IDs if present.
+ * No longer forces redirection to gemini-1.5-pro-latest for non-Gemini models.
  **/
 function maybeReassignModel(req: Request) {
   // Ensure model is on body as a lot of middleware will expect it.
@@ -219,17 +219,15 @@ function maybeReassignModel(req: Request) {
   }
   req.body.model = model;
 
-  const requested = model;
-  if (requested.startsWith("models/")) {
-    req.body.model = requested.slice("models/".length);
+  // Only strip the 'models/' prefix if present
+  if (model.startsWith("models/")) {
+    req.body.model = model.slice("models/".length);
+    req.log.info({ originalModel: model, updatedModel: req.body.model }, "Stripped 'models/' prefix from model ID");
   }
-
-  if (requested.includes("gemini")) {
-    return;
-  }
-
-  req.log.info({ requested }, "Reassigning model to gemini-1.5-pro-latest");
-  req.body.model = "gemini-1.5-pro-latest";
+  
+  // No longer redirecting non-Gemini models to gemini-1.5-pro-latest
+  // This allows the original model to be passed through to the API
+  // If it's an invalid model, the Google AI API will return the appropriate error
 }
 
 // Native Google AI chat completion endpoint