Anthropic Changes Training Data Policy from Opt-In to Opt-Out

From May 2025 version: "We WILL NOT USE your Inputs or Outputs to train our models, unless: (1) your conversations are flagged for Trust & Safety review... or (2) you've explicitly reported the materials to us... or (3) you've OTHERWISE EXPLICITLY OPTED IN to the use of your Inputs and Outputs for training purposes."

From September 2025 version (effective on Sep 28): "We MAY USE your Inputs and Outputs to train our models and improve our Services, UNLESS YOU OPT OUT through your account settings. EVEN IF you opt-out, we will use Inputs and Outputs for model improvement when: (1) your conversations are flagged for safety review to improve our ability to detect harmful content, enforce our policies, or advance AI safety research, or (2) you've explicitly reported the materials to us (for example via our feedback mechanisms)."

Discussion on official post: https://news.ycombinator.com/item?id=45053806