Add gpt-5.4-pro to ChatGPT Plus/Pro OAuth allowlist

[sosise]

Question

Hi! Thanks for OpenCode — the ChatGPT Plus/Pro OAuth flow works great.

I noticed that in packages/opencode/src/plugin/codex.ts, the OAuth allowlist includes:

• gpt-5.4
• gpt-5.4-mini

but does not include:

• gpt-5.4-pro

At the moment, this means gpt-5.4-pro does not show up when using the ChatGPT Plus/Pro auth method, even though regular gpt-5.4 does.

Would it be possible to add gpt-5.4-pro to the allowlist, or clarify whether this omission is intentional?

Relevant code section:

const allowedModels = new Set([
  "gpt-5.1-codex",
  "gpt-5.1-codex-max",
  "gpt-5.1-codex-mini",
  "gpt-5.2",
  "gpt-5.2-codex",
  "gpt-5.3-codex",
  "gpt-5.4",
  "gpt-5.4-mini",
])

Questions:

1. Is gpt-5.4-pro intentionally unsupported for ChatGPT Plus/Pro OAuth in OpenCode?
2. If not, could it be added to the allowlist?
3. If support depends on upstream OpenAI/Codex restrictions, could that be documented so users understand why gpt-5.4 is available but gpt-5.4-pro is not?

This would help clarify whether the limitation is:

• an OpenCode-side filtering decision,
• an upstream auth/backend restriction,
• or simply something that has not been added yet.

Thanks!

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Codex plugin improvement to remove release lag of available models #18566: Feature request to remove the hardcoded Codex model allowlist and avoid release lag for new models (directly related — requests the same underlying fix)
• OAuth filtering blocks user-configured OpenAI model aliases #13401: OAuth filtering blocks user-configured OpenAI model aliases (related — same hardcoded allowlist limitation)

[abaskalov]

I tested this locally with a ChatGPT Personal Pro OAuth login.

After patching the OpenCode OAuth/Codex allowlist, gpt-5.4-pro does appear in opencode models openai, so the model is indeed being hidden on the OpenCode side right now.

However, the actual request still fails on the OpenAI backend with:

The 'gpt-5.4-pro' model is not supported when using Codex with a ChatGPT account.

So this looks like two separate constraints:

1. OpenCode currently hides the model via the local allowlist
2. OpenAI currently blocks gpt-5.4-pro for the ChatGPT-account Codex flow anyway

I wrote up the reproduction and result here:
https://gist.github.com/abaskalov/e25fceccc0826c4679a9900f6ca70055

[sosise]

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