Unable to use gpt-5.6-sol with ChatGPT Plus
Resolved 💬 8 comments Opened Jul 9, 2026 by net-solution Closed Jul 9, 2026
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of Codex CLI is running?
0.144.0
What subscription do you have?
Plus
Which model were you using?
gpt-5.6-sol
What platform is your computer?
Linux 7.1.3-arch1-1 x86_64 unknown
What terminal emulator and version are you using (if applicable)?
st
Codex doctor report
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}What issue are you seeing?
When trying to use gpt-5.6-sol while authenticated with ChatGPT Plus, a 400 error response is received:
Model metadata for `gpt-5.6-sol` not found. Defaulting to fallback metadata; this can degrade performance and cause issues.
■ {"type":"error","status":400,"error":{"type":"invalid_request_error","message":"The 'gpt-5.6-sol' model is not supported when using Codex with a ChatGPT account."}}What steps can reproduce the bug?
- Sign in to Codex using ChatGPT
- Launch Codex with:
codex -m gpt-5.6-sol - Send any prompt
What is the expected behavior?
A successful response from the model is received
Additional information
This only affects sol, both gpt-5.6-luna and gpt-5.6-terra work fine.
Have tried logging out and back in, clearing models_cache.json, and trying a simplified config, but no luck. The model _does_ work when authenticated with an API key, however.
8 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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update: was unaware how recently 5.6 actually released! it was only a few hours ago, and the official page does say "[...] full availability over the next 24 hours"
so it's probably expected to not have it just yet. will re-open the issue if it still isn't available after 24 hrs
working now 🌞🌞🌞🌞🌞🌞
I can reproduce this with a ChatGPT Plus account on Windows.
Environment:
0.144.1gpt-5.6-lunagpt-5.6-solObserved behavior:
codex -m gpt-5.6-lunastarts correctly with Luna.codex -m gpt-5.6-soldoes not start Sol and falls back to the default/current model./modelpicker listsgpt-5.6-terra,gpt-5.6-luna,gpt-5.5,gpt-5.4, andgpt-5.4-mini, but does not showgpt-5.6-sol.gpt-5.6-lunaworks under the same ChatGPT Plus login.Expected behavior:
gpt-5.6-solin Codex CLI if it is documented as available for Plus, or Codex should clearly explain that the account/workspace does not currently have Sol entitlement.Additional context from the local UI:
v0.144.1.D:\Workspace.same here, when using gpt-5.6-sol, response: {"detail":"The 'gpt-5.6-sol' model is not supported when using Codex with a ChatGPT account."}
but gpt-5.6-luna and gpt-5.5 is fine
I see the same issue in codex CLI and codex app:
{"type":"error","status":400,"error":{"type":"invalid_request_error","message":"The 'gpt-5.6-sol' model is not
supported when using Codex with a ChatGPT account."}}
For me it happened right after I resubscribed to the monthly plan. Is this intended behaviour, so new plans get limited access to 5.6 Sol or unintended, as it might take some time until model access available to resubscribers / new subscribers again?
Same; then I did sign in / sign out; it got fixed now.
Yes for me I had to sign in again and wait some time. But also resolved.