Anthropic unveiled Claude Fable 5, the first model in its Mythos‑class lineup, yesterday. The release sparked immediate scrutiny at Microsoft, which has begun limiting the model’s availability for its employees. Sources say the internal model picker used for GitHub Copilot’s internal versions no longer lists Claude Fable 5, even as the model is offered to external Copilot and Foundry customers.

Microsoft’s decision stems from Anthropic’s new data‑retention policy. To power its safety classifiers, Claude Fable 5 stores user prompts and generated outputs for 30 days. If a request is flagged as violating Anthropic’s usage policy, the data can be retained for as long as two years. The policy contrasts with the Zero Data Retention (ZDR) framework that governs other Claude models, which delete data immediately and thus pose fewer privacy risks.

Legal teams at Microsoft are reportedly evaluating whether the retention schedule complies with the company’s internal data‑protection standards. Concerns focus on the possibility that confidential customer information or internal trade secrets could be captured and stored beyond the short‑term window. The review’s outcome will determine whether Claude Fable 5 receives clearance for broader internal deployment.

Despite the restriction, Microsoft continues to make other Claude models available to its workforce. Those models operate under ZDR rules, meaning they do not retain any user data after processing. Employees can still access these versions for internal projects, preserving workflow continuity while the legal review proceeds.

Anthropic introduced the Mythos family with the claim that its models excel at cybersecurity tasks, a capability the company deemed “too dangerous” for unrestricted public release. To mitigate risk, Anthropic built prompt safeguards into Claude Fable 5, but the accompanying data‑retention changes have introduced a new set of legal complexities for partners like Microsoft.

When approached for comment, Microsoft declined to provide further details. The company’s silence leaves analysts watching closely for any indication of how the partnership might evolve once the legal assessment concludes.

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