Unknown model: gpt-5.6-sol on Codex CLI 0.145.0 and ChatGPT desktop

[colossusmaoyuid-art]

What version of Codex CLI is running?

codex app

What subscription do you have?

plus

Which model were you using?

gpt-5.6

What platform is your computer?

macOS

What terminal emulator and version are you using (if applicable)?

No response

Codex doctor report

What issue are you seeing?

• macOS
• Codex CLI 0.145.0
• Logged in using ChatGPT
• GPT-5.5 works normally
• GPT-5.6 Sol is displayed in the model picker, but requests fail with:
  Unknown model: gpt-5.6-sol
• The same problem occurs in the ChatGPT desktop app and Codex CLI.

What steps can reproduce the bug?

Uploaded thread: 019f9391-5fea-7e41-b783-855512f7ecdd

What is the expected behavior?

No response

Additional information

No response

[github-actions]

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

• The 'gpt-5.6-sol' model is not supported when using Codex with a ChatGPT account. #34027

Powered by Codex Action

[colossusmaoyuid-art]

This appears related to #34027, but the issue is still reproducible on Codex CLI 0.145.0. GPT-5.6 Sol works in ChatGPT Work on the web for the same account, while both the ChatGPT desktop app and Codex CLI return: Unknown model: gpt-5.6-sol GPT-5.5 works normally in both local clients. github-actions[bot] ***@***.***>于2026年7月24日 周五18:06写道：

…

*github-actions[bot]* left a comment (openai/codex#35148) <#35148 (comment)> Potential duplicates detected. Please review them and close your issue if it is a duplicate. - #34027 <#34027> *Powered by Codex Action <https://github.com/openai/codex-action>* — Reply to this email directly, view it on GitHub <#35148?email_source=notifications&email_token=CFVVNZRCDSZCZ4T6XTSDMIT5GMYLJA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMBWHA3DAOBRGEY2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-5068608111>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/CFVVNZT22QKNJHGSHVMNZKL5GMYLJAVCNFSNUABFKJSXA33TNF2G64TZHM4TMNJUGE2TMNBZHNEXG43VMU5TIOJWG4ZTSNRXGEZ2C5QC> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/CFVVNZSFTYGHJD4GQYCZTN35GMYLJA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMBWHA3DAOBRGEY2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/CFVVNZRY5H2XXR4VRNRQWJL5GMYLJA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMBWHA3DAOBRGEY2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[colossusmaoyuid-art]

Additional reproduction results: Environment: - macOS - Codex CLI 0.145.0 - ChatGPT authentication All three GPT-5.6 variants fail locally: - gpt-5.6-sol: 400 model_not_found - gpt-5.6-terra: 400 model_not_found - gpt-5.6-luna: 400 model_not_found GPT-5.5 works normally in the same CLI and desktop app. GPT-5.6 Sol also works normally for the same account in ChatGPT Work on the web. Therefore, this affects the entire GPT-5.6 family on the local Codex backend and is not an exact duplicate of #31905, where Terra and Luna reportedly worked. 毛宇 ***@***.***>于2026年7月24日 周五18:10写道：

…

This appears related to #34027, but the issue is still reproducible on Codex CLI 0.145.0. GPT-5.6 Sol works in ChatGPT Work on the web for the same account, while both the ChatGPT desktop app and Codex CLI return: Unknown model: gpt-5.6-sol GPT-5.5 works normally in both local clients. github-actions[bot] ***@***.***>于2026年7月24日 周五18:06写道： > *github-actions[bot]* left a comment (openai/codex#35148) > <#35148 (comment)> > > Potential duplicates detected. Please review them and close your issue if > it is a duplicate. > > - #34027 <#34027> > > *Powered by Codex Action <https://github.com/openai/codex-action>* > > — > Reply to this email directly, view it on GitHub > <#35148?email_source=notifications&email_token=CFVVNZRCDSZCZ4T6XTSDMIT5GMYLJA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMBWHA3DAOBRGEY2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-5068608111>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/CFVVNZT22QKNJHGSHVMNZKL5GMYLJAVCNFSNUABFKJSXA33TNF2G64TZHM4TMNJUGE2TMNBZHNEXG43VMU5TIOJWG4ZTSNRXGEZ2C5QC> > . > Triage notifications, keep track of coding agent tasks and review pull > requests on the go with GitHub Mobile for iOS > <https://github.com/notifications/mobile/ios/CFVVNZSFTYGHJD4GQYCZTN35GMYLJA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMBWHA3DAOBRGEY2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> > and Android > <https://github.com/notifications/mobile/android/CFVVNZRY5H2XXR4VRNRQWJL5GMYLJA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMBWHA3DAOBRGEY2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. > Download it today! > You are receiving this because you authored the thread.Message ID: > ***@***.***> >