Codex GPT-5.5 model not found: diagnose the 404
This story is from 2026-09-12. It is preserved in the archive; the latest stories are on the live feed.
If Codex reports that gpt-5.5 does not exist or you do not have access to it, check the combination of model ID, provider and authentication before changing your subscription . A valid ChatGPT login does not establish access through an API key, and a valid provider key does not establish that the p…
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- 2026-09-12 11:34 · DEV Community — AI
Codex GPT-5.5 model not found: diagnose the 404