Cannot use GPT-5.3-Codex in Cursor

Support Bug Reports
1

Provider returned error: {“error”:{“code”:“invalid_parameter_error”,“message”:“model gpt-5.3-codex is not supported.”,“param”:null,“type”:“invalid_request_error”}}

image
image490×267 6.57 KB

GPT-5.3-Codex is unavailable but can be enabled in the settings, why? (my Cursor has been updated to the latest version)

6

Hi @Hao_Sun

A couple of things could be causing this:

  1. Custom OpenAI API key: This error most commonly occurs when you have an OpenAI API key configured in Cursor Settings. Codex 5.3 is available through Cursor’s built-in model routing (included in your Team plan), but it’s not available through personal OpenAI API keys. Go to Cursor Settings > Models and check if you have a key entered in the OpenAI API Key field. If so, try removing it and restarting Cursor.

  2. Regional restrictions: Certain models are restricted in some regions due to policies set by the model providers (OpenAI, Anthropic, Google). This is not something Cursor controls. If you’re in a region where OpenAI models are restricted, try using Auto mode, which automatically selects the best available model for your region.

Let me know if either of those resolves it!

1 Like
7

Today all Anthropic models have been removed from the list of the available models

Is it because of the geo restrictions?

p.s. i’m on Cursor 2.4

8

The problem was caused by the first reason, and I’ve fixed it now. Thank you for your reply.