Microsoft adds Claude Fable 5 to Microsoft 365 Copilot for long multi-step work
Microsoft released Claude Fable 5 as a preview model in Microsoft 365 Copilot for longer multi-step workflows grounded in organizational files, meetings, chats and business data. Administrators control access, and Microsoft explicitly warned organizations to review Anthropic's data-retention requirement before enabling it.
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Why it moved the index
Magnitude 40 reflects deployment of a frontier long-horizon model into organization-grounded knowledge work, tempered by preview status, administrator choice and enterprise controls. Confidence 93 reflects a dated first-party Microsoft announcement with exact model, workflow, grounding and retention details.
Assessment history
- R1Toward 40 · confidence 93
New distinct enterprise deployment: Microsoft integrated Fable 5 into organization-grounded Microsoft 365 Copilot workflows one day after the model's general launch.
12 Aug 2026