Overview

• Anthropic’s Claude Sonnet 4 and Claude Opus 4.1 are now selectable in the Researcher agent and Copilot Studio, expanding options beyond OpenAI.
• Copilot remains powered by OpenAI by default, with admins required to opt in via the Frontier program and enable Anthropic models in the Microsoft 365 Admin Center.
• Agents built with Anthropic will automatically fall back to OpenAI GPT-4o if Claude access is disabled, preserving continuity without extra setup.
• Claude is accessed over Anthropic’s API and runs on AWS and Google Cloud infrastructure, with usage governed by Anthropic’s terms.
• Microsoft says Anthropic models are available in early release today, will reach preview in all environments within two weeks, and target production readiness by year-end, supporting a broader supplier diversification strategy.