Claude models in Microsoft 365 Copilot

Microsoft · 24 September 2025

Researcher agent can run on Claude Opus 4.1, and Copilot Studio adds Claude Sonnet 4 and Opus 4.1 beside OpenAI models.

First time Microsoft's flagship Copilot offered a non-OpenAI frontier model, via an opt-in Frontier Program; the Anthropic models are hosted outside Microsoft's environment under Anthropic's terms.

Date

Wednesday, 24 September 2025

Lab

Microsoft

Kind

feature

Access

closed API

Part of Microsoft's multi-model hedge alongside MAI models.

Sources

1. www.microsoft.com/en-us/microsoft-365/blog/2025/09/24/expanding-model-choice-in-microsoft-

This record was checked against its sources on 6 October 2026. How we check

Related

• Microsoft 365 Copilot