Microsoft adds Claude Sonnet 5.5 to Copilot for Word, Excel, and chat
The model will roll out gradually over the next week for Word, Excel, PowerPoint, and chat, included in the Copilot license with usage limits. Organizations must enable Anthropic’s use to access it, though Claude has been available in stages since September 2025. Claude Opus 5.5 was added earlier this month. Users can switch models via the “Model Selection” option, with Microsoft noting most…
Key points
- Claude Sonnet 5.5 added to Microsoft 365 Copilot for Word, Excel, PowerPoint, and chat as pay-as-you-go in Copilot Cowork/Studio
- FTC investigates OpenAI, Anthropic, and METR for AI safety response violations under consumer protection laws
The FTC cited recent cases where AI agents performed unexpected actions, signaling potential legal scrutiny of safety disclosures. This follows a voluntary safety agreement signed at the White House the prior day, indicating parallel efforts in self-regulation and government oversight. Bloomberg reported on October 1 that Anthropic’s IPO may now target mid-November, delayed from earlier October reports, though no official confirmation exists. The timing aligns with investor outreach planned for early November.
Model pages: Claude Sonnet 5.5 → · Claude Opus 5.5 → · GPT-6.1 Sol →
The story so far
2 episodes →- Microsoft adds Claude Sonnet 5.5 to Copilot for Word, Excel, and chatthis story
[October 2, 2026] Claude Sonnet 5.5 is now available in Microsoft 365 Copilot! / US FTC investigates OpenAI and Anthropic
note.com · 1 October 2026
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