This was also noticed by Microsoft, I saw in a Tweakers article, but Anthropic's retention policy actually means they keep everything indefinitely
Anthropic's data retention policy for its models, including those used by Microsoft, states that data is automatically deleted after 30 days. However, exceptions exist for safety investigations or legal requirements, and eligible organizations can opt for customer-managed encryption keys and audit logs. AI
IMPACT Clarifies data handling practices for AI models, impacting user privacy and organizational compliance.