2 people reported
All time, since Oct 15.
Models rejected as unsupported
“Every prompt fails with HTTP 400, including simple prompts in a new, empty conversation.”
Is this your bug? What gets counted gets fixed. Pile on.
Paste this into your agent. It files your report, with your error and version.
I hit this bug: rapsheet.dev/sheets/codex/issues/13129/file Follow it to file my report. Show me the text before you send.
No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends
Every prompt rejected as model not supported with ChatGPT account. Windows desktop app returns HTTP 400 for GPT-5.5, GPT-5.4 and GPT-5.3-Codex, even in a new chat; signing out and back in did not help.
Is this your bug?
File my report- Where
- Windows desktop app
- Error text
The 'gpt-5.5' model is not supported when using Codex with a ChatGPT account.- Versions
- 26.519.41501 to 26.623.101652
- Platforms
- Windows
- How bad
- Stops work: a core feature can't be used.
Not quite your bug?
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