Four of five Claude cells retain prompts by default

An independent tracker of AI data-retention policy shipped its first release, and for Anthropic’s commercial surfaces the answer is that prompts stay unless someone turns retention off. ProvenBrief verified five model-and-tier cells against dated provider documents; four retain by default.

Claude Fable 5.1, in GitHub Copilot since September 1, 2026, can’t run unless Anthropic retains prompts and outputs, though GitHub’s changelog says that data isn’t used to train Anthropic’s models. Zero data retention there is available only to enterprises approved under an exemption dated through December 31, 2026.

Anthropic’s terms also state that Covered Models under a Business Associate Agreement require 30-day retention and aren’t available with ZDR enabled.