Breaking

Microsoft Adds Anthropic's Claude Fable 5 to Microsoft 365 Copilot

June 11, 2026 at 12:00 EDT

Foundation Models
Sales & Business
AI Agents

On June 10–11, Microsoft brought Anthropic's frontier model Claude Fable 5 into Microsoft 365 Copilot in preview, positioning it for longer and more complex work spanning knowledge tasks, coding and visual reasoning. The move was announced on the Microsoft Tech Community blog, emphasizing expanded model choice—matching the model to the work—combined with Work IQ, which grounds the model in a user's work context.

June 10, 2026 · Microsoft 365 Copilot

Anthropic's Claude Fable 5 arrives in Microsoft 365 Copilot

Microsoft brings Anthropic's first "Mythos class" model to Copilot as a default-off preview — built for long, complex work across knowledge tasks, coding and visual reasoning, grounded in work context through Work IQ.

80.3%

SWE-Bench Pro — resolving real GitHub issues

Token context window for large docs & codebases

90%

Max input discount with prompt caching

Token pricing — output costs 5× the input

Per million tokens

$10

Input

$50

Output

Native across the Microsoft ecosystem

Microsoft 365 Copilot

Preview in Copilot Cowork (Frontier); private preview in Excel & PowerPoint

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Microsoft Foundry

Azure AI — powering autonomous agents

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GitHub Copilot

Generally available; fewer tool calls in internal tests

The strength

Top-tier for long, complex work — research, analysis, large-scale code generation and visual tasks — with long-horizon autonomy that can plan, track dependencies and self-correct across multi-day tasks.

The caution

Processing runs externally on Anthropic's side — prompts and outputs may be stored up to two years, outside Microsoft's standard data protection. Admins must enable "AI models in preview" and validate data protection before enterprise use.

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