SITUATION EXPLAINED: Fable 5.1 and Mythos 5.1 are out, with the strongest cyber capabilities Anthropic has ever released. • Mythos 5.1 developed full working exploits in 98% of trials, up from 88%. Anthropic says these are the strongest cyber capabilities of any model it has released • 52.6% on Terminal Bench Science, more than double Fable 5, and evaluated with production safeguards on, so it understates the real capability • Pricing is unchanged at $10 and $50 per million tokens, but a…

Claude@claudeaiSep 1

We’re introducing Claude Fable 5.1 and Claude Mythos 5.1. They're the world’s most advanced models for coding and knowledge work.