It's part of their transparency commitments? They've been doing this since 2023: https://www.anthropic.com/system-cards

And lots of folks read these. For example here's simonw's notes on the Claude 4 system card: https://simonwillison.net/2025/May/25/claude-4-system-card/

All of this seemed like utter sci-fi just a couple years ago. Do you think that frontier AI companies should be less transparent?