AWS Bedrock to require sharing data with Anthropic for Mythos and future models

AWS Bedrock will require 30-day data retention for Mythos and future models to detect misuse patterns. This data will leave AWS's security boundary. Users can opt-in, but data is deleted after 30 days unless part of a safety investigation or required by law. This change affects Fable 5, Mythos 5, and future models with similar capability levels. Engineers should review their data retention policies.