Feature request for product/service
Cursor IDE
Describe the request
It seems like Codex-high is not available in Cursor, only medium
Can we use it somehow?
Screenshot / Screen Recording
Operating System (if it applies)
Windows 10/11
@deanrie Could you take a look when you have time?
Hey, thanks for the feature request. GPT-5-Codex doesn’t have configurable “thinking” levels like “high” or “medium.”
According to OpenAI’s documentation, GPT-5-Codex uses adaptive reasoning, it automatically adjusts its reasoning time based on task complexity. It’s designed to be fast in interactive sessions while still handling complex tasks on its own.
So you’re already getting the model’s full capabilities without choosing a “thinking” level. The model decides the right depth for each request.
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I think there’s some misunderstanding. Codex’s official CLI lets users choose between low/med/high reasoning and I believe these tune the adaptive reasoning, so high will generally prefer more reasoning but it may still finish quickly in trivial cases. I was also surprised Cursor does not provide low/medium/high variants for Codex.
GPT-5-Codex is only available in the Responses API and supports low, medium, and high
reasoning_efforts
https://platform.openai.com/docs/guides/latest-model#faq
https://www.perplexity.ai/search/gpt-5-codex-in-api-does-it-sup-xEOhgpfxQ.GIhc6l9wFItw#0
PS. Possible duplicate thread: Why is there no gpt-5-codex-(high|medium|low)
API does not offer reasoning levels, read again.
Effectively it’s gpt5-codex-medium, which almost made me ignore Codex CLI back when (it’s not that good).