Anthropic Requires Fable and Mythos Models to Retain Data for 30 Days
Original: Anthropic requires 30 day data retention for Fable and Mythos
Anthropic will retain prompts and outputs for Mythos-class models for 30 days for safety analysis.
Anthropic says Mythos-class models require limited prompt and output retention for trust and safety work across platforms where they are offered. The policy took effect on June 9, 2026 and mainly affects organizations using Zero Data Retention through Claude Console, Claude Code Enterprise, AWS Bedrock, Google Cloud Agent Platform, or Microsoft Foundry. Consumer Claude Free, Pro, and Max plans are unchanged, while Anthropic describes restricted human review and automatic deletion after 30 days.
Anthropic explained in the Claude Help Center that it is introducing a new limited data retention and review requirement for Mythos-class models: prompts submitted to these models, as well as the outputs generated by the models, will be retained for 30 days for trust and safety purposes. This policy took effect on June 9, 2026, and applies to Claude Mythos 5, Claude Fable 5, and future models with similar capabilities that Anthropic designates as covered models; other models remain subject to the existing terms.
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