Claude Sonnet 5 and GPT-5.5 Chat in Copilot Studio (Generally Available)

You can pick Claude Sonnet 5 or GPT-5.5 Chat as the main model driving a Copilot Studio agent.

Both are generally available as an agent's primary model, chosen in the agent's model setting
Microsoft credits the change to improved response quality and reasoning
Using a model from outside Microsoft needs an administrator to turn on access to external models for the environment
Some models require data processing and storage outside your organization's own geography

Tuning an agent's answer quality by swapping the model behind it

The default model gives weak or inconsistent answers on your agent's particular task

Makers who want model choice rather than whatever Microsoft defaults to

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Microsoft Copilotmodel

June 1, 2026·Source

You can pick Claude Sonnet 5 or GPT-5.5 Chat as the main model driving a Copilot Studio agent.

Both are generally available as an agent's primary model, chosen in the agent's model setting
Microsoft credits the change to improved response quality and reasoning
Using a model from outside Microsoft needs an administrator to turn on access to external models for the environment
Some models require data processing and storage outside your organization's own geography

Tuning an agent's answer quality by swapping the model behind it

The default model gives weak or inconsistent answers on your agent's particular task

Makers who want model choice rather than whatever Microsoft defaults to

Pick a topic and leave with something you created.

Get new module drops and weekly AI strategy.