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Windows Central
Windows Central
Technology
Kevin Okemwa

Anthropic's new data retention policies cause Microsoft to temporarily ban its employees from using Claude Fable 5 AI

The Anthropic AI logo is displayed on a mobile phone with a visual digital reflected background in this photo illustration in Brussels, Belgium, on December 7, 2025. (Photo by Jonathan Raa/NurPhoto via Getty Images).

In a not-so-surprising turn of events, Microsoft is reportedly limiting the use of Claude Fable 5 because of Anthropic's new data retention requirements. It's part of Anthropic's Mythos class of models and ships with powerful capabilities across software engineering and analytics.

Following the new data retention requirements, Anthropic can now retain prompts and outputs generated for up to 30 days. It's also worth noting that content flagged by its safety systems can be retained for up to 2 years to facilitate ample time for investigation or enforcement.

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