Comment by jumploops

That’s what I used to think, before chatting with the OAI team.

The docs are a bit misleading/opaque, but essentially reasoning persists for multiple sequential assistant turns, but is discarded upon the next user turn[0].

The diagram on that page makes it pretty clear, as does the section on caching.

[0]https://cookbook.openai.com/examples/responses_api/reasoning...