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Anthropic
2026-09-15 07:34:12

Anthropic’s data retention policy triggers enterprise pushback against Fable

Anthropic is facing resistance from major enterprise customers after changing the data-handling rules for its flagship Fable model. On June 9, the company updated its support policy so that prompts and outputs for Mythos-tier models, including Fable and Mythos, would be retained for 30 days under its trust and safety framework, with some flagged conversations reportedly stored for as long as two years. The policy also overrode existing Zero Data Retention, or ZDR, arrangements for those top-end models. That move set off objections from large customers and platform partners. The report says Microsoft quickly restricted internal employee access and kept Fable out of its internal Copilot model list pending legal review. Palantir publicly challenged the shift, arguing that Anthropic had undermined an earlier irrevocable ZDR commitment, and has reportedly refused to list Fable on its platform unless that language returns. Nvidia, Booz Allen, and Northrop Grumman are also described as limiting or replacing Fable in sensitive use cases. Anthropic later introduced an Enterprise Frontier Safeguards program alongside Fable 5.1 on Sept. 1, but questions remain over its invitation-only rollout, limited model coverage, and the company’s ability to withdraw the option. The dispute has grown beyond simple storage periods and now centers on how much visibility model providers have into enterprise data and workflows.

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Anthropic’s data retention policy triggers enterprise pushback against Fable