Reapply "feat: add github copilot gpt-5.3-codex model (#912)"

[mongrelion]

This reverts commit bac557c.

---

This feature had been previously reverted (#920) because the model was not yet generally available.

It seems like the model is now available for all users.

@rversteegen mentions on issue #885

A Github employee commented on Reddit 4 days ago that the rollout to all users is complete.

The Github employee says on Reddit:

All the users should have it now. Make sure you are on latest vscode version. If you still do not see it - let me know what GitHub plan are you on?

Closes

• GPT 5.3 Codex disappeared from model selection list (Github Copilot) #885
• Add GPT-5.3-Codex to GitHub Copilot provider #838

[rekram1-node]

It's not fully rolled out!

You can easily test this urself just do this:

{
  "provider": {
    "opencode": {
      "options": {},
    },
    "github-copilot": {
      "models": {
        "gpt-5.3-codex": {},
      },
    },
  },
}

And youll see:

It's not available outside of their clients

[mongrelion]

please fix this issue ASAP

@Khnx-ai You are probably new to the open source world so I will teach you this: the maintainers of this project and any other software that you don't pay for don't owe you anything, so even if you say "please" in this case is still considered rude.

I suggest you remove your comment altogether.

[mongrelion]

It's not fully rolled out!
[...]
It's not available outside of their clients

@rekram1-node you are right. I just tested it out and I get the same error :(

I guess I was too quick to draw my gun

[Khnx-ai]

please fix this issue ASAP

@Khnx-ai You are probably new to the open source world so I will teach you this: the maintainers of this project and any other software that you don't pay for don't owe you anything, so even if you say "please" in this case is still considered rude.

I suggest you remove your comment altogether.

Thank you for the feedback and for clarifying the expectations. I am still getting used to the open-source workflow and didn't mean any disrespect. I’ll keep that in mind for future contributions. I have deleted the original comment as suggested.

[ChrisSku]

Just a Question/Hint:
In Visual Studio Code it is working, but in Opencode I am getting the same error.

Are there some restrictions that it is only available in VSCode?

[antonio-ivanovski]

Are there some restrictions that it is only available in VSCode?

True.
You can use local deployment of anomalyco/opencode#13485

[rekram1-node]

please refer to my comment above, its not available outside of their clients yet.