Anthropic now requires 30-day data retention on all traffic, ending zero-retention enterprise deals.

With the Fable 5 / Mythos 5 launch, Anthropic mandates 30-day retention on all API traffic, including for enterprises that previously held zero-retention agreements (CNBC). If you run privacy-sensitive or regulated workloads, a key compliance guarantee just disappeared. Re-review your data-handling assumptions before you send production traffic, and if you signed contracts on the zero-retention promise, that's a conversation with legal, not a "deal with it later." This is the kind of change that quietly invalidates a compliance posture you thought was settled.