{"version":1,"type":"story","url":"https://digestai.news/story/microsoft-adds-claude-sonnet-5-5-to-copilot-for-word-excel-and-chat","json":"https://digestai.news/story/microsoft-adds-claude-sonnet-5-5-to-copilot-for-word-excel-and-chat.json","markdown":"https://digestai.news/story/microsoft-adds-claude-sonnet-5-5-to-copilot-for-word-excel-and-chat.md","slug":"microsoft-adds-claude-sonnet-5-5-to-copilot-for-word-excel-and-chat","headline":"Microsoft adds Claude Sonnet 5.5 to Copilot for Word, Excel, and chat","summary":"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 will not hit limits. The move reflects growing competition between OpenAI’s GPT-6.1 Sol and Anthropic’s Claude models in enterprise tools, per Microsoft’s blog post and the Message Center update MC1483844.**\n\nThe 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.","keyPoints":["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"],"whyItMatters":"The integration of Claude Sonnet 5.5 into Copilot expands enterprise AI choice, while FTC scrutiny signals stricter oversight of AI safety disclosures.","category":{"slug":"enterprise","name":"Enterprise & Industry","url":"https://digestai.news/category/enterprise"},"entities":{"companies":["Microsoft","OpenAI","Anthropic","METR","US Federal Trade Commission"],"models":["Claude Sonnet 5.5","Claude Opus 5.5","GPT-6.1 Sol"],"people":[]},"firstPublishedAt":"2026-10-01T21:19:00Z","updatedAt":"2026-10-01T21:19:00Z","sourceCount":1,"hasPrimarySource":false,"sources":[{"outlet":"note.com","title":"[October 2, 2026] Claude Sonnet 5.5 is now available in Microsoft 365 Copilot! / US FTC investigates OpenAI and Anthropic","url":"https://note.com/teru0358/n/ne1f2d0a33ca0?hl=en","publishedAt":"2026-10-01T21:19:00Z","type":"press","primary":false,"lead":true}],"sourceNotes":null,"discussions":[],"thread":{"title":"Anthropic Claude Expands Across Microsoft Productivity Tools","url":"https://digestai.news/thread/opinion-claude-adds-docs-and-slides-sparking-debate-over-office-integration","storyCount":2},"cite":{"text":"Digest AI, \"Microsoft adds Claude Sonnet 5.5 to Copilot for Word, Excel, and chat\", 1 October 2026, https://digestai.news/story/microsoft-adds-claude-sonnet-5-5-to-copilot-for-word-excel-and-chat","publisher":"Digest AI","title":"Microsoft adds Claude Sonnet 5.5 to Copilot for Word, Excel, and chat","datePublished":"2026-10-01T21:19:00Z","url":"https://digestai.news/story/microsoft-adds-claude-sonnet-5-5-to-copilot-for-word-excel-and-chat"},"generatedBy":"Written by Digest AI's editorial model from the linked sources; the sources are the record.","license":"Headlines, digests and key points are written by Digest AI and may be quoted with a link to the story page. Linked articles belong to their publishers. Terms: https://digestai.news/terms#reuse"}