[Linkpost] “Claude 4” by Zach Stein-Perlman

Claude Sonnet 4 and Claude Opus 4 are out. Anthropic says they're both state-of-the-art for coding. Blogpost, system card.

Anthropic says they may have dangerous bio capabilities, so it's implementing its ASL-3 standard for misuse-prevention and security. Blogpost, safety case report. (RSP.)

Tweets: Anthropic, Sam Bowman, Jan Leike.

Claude 3.7 Sonnet has been retconned to Claude Sonnet 3.7 (and similarly for other models).

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First published:

May 22nd, 2025

Source:

https://www.lesswrong.com/posts/k9wrDrvEwuReSHCKv/claude-4

Linkpost URL:
https://www.anthropic.com/news/claude-4

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Narrated by TYPE III AUDIO.