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

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.

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

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.

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?

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

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

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

This seems to be working now.

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

Is it officially supported now?

edit: it does supported now! i tried adding the config locally like above! so i think this could be implemented

@rekram1-node is there anything blocking this from being merged?

Both 5.3-codex and 5.4 are now available 🎉

I was on vacation, just got back. it looks like someone else added it, sorry didn't get to merge this one.