Claude 4

Link post

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 Opus 4 may have dangerous bio capabilities, so it’s implementing its ASL-3 standard for misuse-prevention and security for that model. (It says it has ruled out dangerous capabilities for Sonnet 4.) 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).