Microsoft warns staff: Don't touch Claude Fable 5, lawyers are still reading fine print | TheBriefWire
Microsoft warns staff: Don't touch Claude Fable 5, lawyers are still reading fine print
Published 11 June 2026 ยท tech
Microsoft has blocked its own employees from using Anthropic's newly launched Claude Fable 5 inside GitHub Copilot, citing unresolved concerns over a 30-day data retention
Microsoft has blocked its own employees from using Anthropic's newly launched Claude Fable 5 inside GitHub Copilot, citing unresolved concerns over a 30-day data retention policy tied to the Mythos-class model.
The Verge reports Microsoft's legal team is still reviewing the changes, even as paying Copilot and Foundry customers already have access. Other Claude models remain
available internally under Zero Data Retention rules. Anthropic has not offered a workaround.
Published: June 11, 2026 โข 9:37 AM IST ยท Updated: June 11, 2026 โข 10:02 AM ISTBy TheBriefWire Editorial Team
Key points
Microsoft has blocked its own employees from using Anthropic's newly launched Claude Fable 5 inside GitHub Copilot, citing unresolved concerns over a 30-day data retention policy tied to the Mythos-class model.
The Verge reports Microsoft's legal team is still reviewing the changes, even as paying Copilot and Foundry customers already have access.
Other Claude models remain available internally under Zero Data Retention rules.