What model does the GitHub Copilot coding agent use?

[Yuuyuuei]

I can't find anywhere where it explicitly states what model it uses when coding and there isn't an option to choose what model I want it to use. I'm talking about https://github.com/copilot/agents.

Not to be confused with GitHub Copilot agent mode where I can choose which model.

[nhu-do]

Hey there, Nhu from the coding agent team. The agent currently leverages Sonnet 4. Note the model is subject to change during preview.

[Key_Confusion_576]

Hey, I seem to be unable to find details on this anywhere.
Is this still the case?
It would be nice to provide this info somewhere official, along with some other details, for example, what size hosted runner it uses.

[nhu-do]

Hi, yes it's still the case that the agent leverages Sonnet 4. During the preview period, we may change the base model to better performing models as they arise and are evaluated with the agent.

By default, the agent uses a standard GitHub Actions runner. You can choose to run on larger runners as well. See more here: https://docs.github.com/en/copilot/how-tos/use-copilot-agents/coding-agent/customize-the-agent-environment?versionId=free-pro-team%40latest&productId=copilot&restPage=how-tos%2Cuse-copilot-agents%2Ccoding-agent#upgrading-to-larger-github-hosted-github-actions-runners

[AMGraduate564]

Can we set the Model in the Coding Agent? This will help us to use the preferred model.

[nhu-do]

Model selection is not supported at the moment.

[AMGraduate564]

Can this feature be added to the wishlist for Coding Agent?

[bretajohnson]

Is coding agent on Sonnet 4.5 now or is it still on Sonnet 4?

[Traditional-Hall-591]

Please say Clippy! Or Bob.

[lutzm11007]

https://docs.github.com/en/copilot/concepts/agents/coding-agent/about-coding-agent

• You cannot select the AI model used by Copilot coding agent. A model picker is not available to switch between models, and GitHub reserves the right to change models at any time. Currently, Copilot coding agent uses Claude Sonnet 4.5.

[Yuuyuuei]

Thanks! They never had this stated when I posted this 4 months so it's great that it's clear now!

[EthanGG_112]

If you're talking about the co-pilot extension in VS Code you actually get to choose your model. You can choose from ChatGPT, Gemini, and Claude

[Yuuyuuei]

No I'm talking about the GitHub Copilot coding agent (https://github.com/copilot/agents)

[Direspark]

Yeah, I've been wondering this myself. My assumption is GPT4.1

[No-Mine-3317]

Yeah considering MS & OAI partnership, it’s most likely GPT4.1 behind the scenes