Where does the bug appear (feature/product)? Cursor IDE Describe the Bug in our project there arent any custom model id added, we use the ones in the builtin cursor model list. Rquest ID:c8b018d5-0901-4657-b260-1eaccc5d020d cursor version:Version: 3.3.30VSCode Version: 1.105.1Commit: 3dc559280a…

btw @deanrie , i was wondering if the new codex auth integration is somehow against cursor guidelines, i read em and there isnt anything explicit against it, but i can understand if it was in fact against that, if it is a proble, then i will delete the new codex integration from the repo and rewrit…

Hey, this is the same bug that’s discussed in GPT-5.5 BYOK not working . For the GPT-5 family, Cursor converts the request body to the Responses API format input instead of messages, but it only rewrites the URL to /v1/responses for the native OpenAI provider. With Override OpenAI Base URL, things ge…

5.5 custom base url model bug

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Topic		Replies	Views
Override OpenAI Base URL sends Responses API payload to /chat/completions but expects Chat Completions output Bug Reports byok , openai	1	221	April 29, 2026
It's a communication error between Cursor and the Openai compatible provider Bug Reports byok , openai	1	101	April 24, 2026
Non-Auto Models Not Working Bug Reports byok , openai , composer	1	131	April 25, 2026
GPT-5.5 Medium fails with Provider Error: tools[0] missing field `function` Bug Reports openai , linear-linked	1	52	June 18, 2026
Using Azure OpenAI API Key Bug Reports nightly , byok , openai , linear-linked	2	69	July 9, 2026

5.5 custom base url model bug

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