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We’re excited to announce that Claude Sonnet 4.5 – Anthropic’s latest and most capable model – is rolling out today in Microsoft Copilot Studio. This builds on last week’s announcement and our commitment to bring the best AI innovation from across the industry to Microsoft 365 Copilot, tuned for work and tailored to your business needs.

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Claude Sonnet 4.5 will replace Claude Sonnet 4 in Copilot Studio and can be chosen for orchestration. Availability from prompt builder will arrive later in October. If you have already opted into using Anthropic models in your tenant, there’s no action required. Otherwise, you can get started by enabling access in the Microsoft Admin Center (MAC).

A screenshot with zoomed inset showing a user choosing Claude Sonnet 4.5 as their agent's model

You can learn more about Claude Sonnet 4.5 from Anthropic’s launch announcement: Introducing Claude Sonnet 4.5 Anthropic. Read more about model choice in Copilot Studio here.

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Ami Shastri

Principal Product Manager, Copilot Studio

Ami Shastri leads model strategy and agility for Microsoft Copilot Studio, the platform for discovering, customizing, and building enterprise-ready AI agents and agentic workflows. Copilot Studio enhances employee productivity by handling long-form tasks as an employee would or operating autonomously. The platform offers a comprehensive studio for building, orchestrating, and overseeing AI agents, and is utilized by thousands of companies.

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