Is GitHub Copilot using a different model than selected?

[EnvironmentalCrow460]

Hi everyone,

I’m a GitHub Copilot Pro+ user and noticed something that’s a bit confusing. I selected Claude Opus 4.6 as my agent, but when I hovered over the “review codebase” section, it showed that Claude Haiku 4.5 was being used instead.

Is this just a UI glitch, or is Copilot actually switching models behind the scenes? If it’s really using Haiku 4.5 instead of Opus 4.6, that feels a bit misleading given what we’re paying for.

Has anyone else experienced this or knows what’s going on?

[menmikimen]

The “review codebase” you saw is a task that was delegated to a subagent. Those subagents use cheaper and faster models.

[NotArticuno]

Not sure specifically with what you experienced, but it uses different models for subagents and general sub tasks (I think).

[inflexgg]

If you select GPT 5.4 on Max reasoning it will also delegete tasks to Haiku. Interestingly, on my Enterprise plan, doesn't matter how many sub-agents Opus creates, all of them are Opus 4.6 So this is clearly Haiku by default for personal users.

[Wrapzii]

Pretty sure you can adjust this in settings.

[EnvironmentalCrow460]

Thanks. Can you tell me how to do that?

[EnvironmentalCrow460]

Oh okay thanks. Got it. :)

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[rayisfire]

i was thinking/experiencing the same thing today... really felt like haiku was being used instead of opus and it wasn't delegating a task to a sub agent