Anthropic requires 30 day data retention for Fable and Mythos (support.claude.com) AI

Anthropic says it will require a 30-day retention period for prompts and outputs from its “Mythos-class” (including Claude Mythos 5 and similar future covered models) for trust and safety review, with the change taking effect June 9, 2026. The policy applies only to organizations using zero data retention (ZDR) via Claude Console/Claude Enterprise, Claude Code, or through Bedrock/Google Cloud Agent Platform/Microsoft Foundry with ZDR, while other consumer plans and non-ZDR organizations remain unaffected. Anthropic states the retained data is restricted from employees and is deleted after 30 days unless needed for a safety investigation or legal requirement.