Anthropic requires 30 day data retention for Fable and Mythos https:// support.claude.com/en/articles /15425996-data-retention-practices-for-mythos-class-models
Anthropic is implementing a mandatory 30-day data retention policy for its advanced Mythos and Fable models, starting June 9, 2026. This policy applies to organizations using these models via specific enterprise platforms and cloud services, excluding consumer plans which already have similar retention practices. The company states this measure is crucial for safety, enabling the detection of sophisticated misuse patterns that require analyzing multiple requests over time. AI
IMPACT Requires organizations using advanced Anthropic models to adapt data handling practices for safety and compliance.