gpt5 codex somewhat

src/proxy/middleware/request/preprocessors/validate-context-size.ts

@@ -75,6 +75,8 @@ export const validateContextSize: RequestPreprocessor = async (req) => {
     modelMax = 400000;
   } else if (model.match(/^gpt-5-chat-latest$/)) {
     modelMax = 400000;
+  } else if (model.match(/^gpt-5-codex(-latest|-\d{4}-\d{2}-\d{2})?$/)) {
+    modelMax = 400000;
   } else if (model.match(/^chatgpt-4o/)) {
     modelMax = 128000;
   } else if (model.match(/gpt-4-turbo(-\d{4}-\d{2}-\d{2})?$/)) {

src/proxy/openai.ts

@@ -336,6 +336,18 @@ const setupChunkedTransfer: RequestHandler = (req, res, next) => {
     });
   }
   
+  // Check if user is trying to use streaming with gpt-5-codex models
+  if (req.body.model?.startsWith("gpt-5-codex") && req.body.stream === true) {
+    return res.status(400).json({
+      error: {
+        message: "The gpt-5-codex models do not support streaming. Please set 'stream: false' in your request.",
+        type: "invalid_request_error",
+        param: "stream",
+        code: "streaming_not_supported"
+      }
+    });
+  }
+  
   // Only o1 doesn't support streaming
   if (req.body.model === "o1" || req.body.model === "o1-2024-12-17") {
     req.isChunkedTransfer = true;
@@ -358,8 +370,9 @@ const setupChunkedTransfer: RequestHandler = (req, res, next) => {
 // Functions to handle model-specific API routing
 function shouldUseResponsesApi(model: string): boolean {
   return model === "o1-pro" || model.startsWith("o1-pro-") ||
-         model === "o3-pro" || model.startsWith("o3-pro-") || 
-         model === "codex-mini-latest" || model.startsWith("codex-mini-");
+         model === "o3-pro" || model.startsWith("o3-pro-") ||
+         model === "codex-mini-latest" || model.startsWith("codex-mini") ||
+         model === "gpt-5-codex-latest" || model.startsWith("gpt-5-codex");
 }
 
 // Preprocessor to redirect requests to the responses API

src/shared/models.ts

@@ -282,6 +282,7 @@ export const OPENAI_MODEL_FAMILY_MAP: { [regex: string]: OpenAIModelFamily } = {
   "^o3(-\\d{4}-\\d{2}-\\d{2})?$": "o3",
   "^o4-mini(-\\d{4}-\\d{2}-\\d{2})?$": "o4-mini",
   "^codex-mini(-latest|-\d{4}-\d{2}-\d{2})?$": "codex-mini",
+  "^gpt-5-codex(-latest|-\\d{4}-\\d{2}-\\d{2})?$": "gpt5",
 };
 
 export function getOpenAIModelFamily(