Anthropic's Fable 5.2 and Mythos 5.2 are out, Fermat's proof checked
Anthropic's Fable 5.2 and Mythos 5.2, Fable's Fermat proof, Anthropic's pulled IPO pricing and gas generators, Meta's Muse Ember, a Fireworks AI hack and Apple's AI usage packs.
Anthropic’s Fable 5.2 and Mythos 5.2 are out Fable now costs $8 per million tokens in and $40 out, down a fifth, and beats Opus 5.5 on most of Anthropic’s own tests. Artificial Analysis put it first in all six of its work areas, from finance to engineering. Both came out on Monday, and Mythos 5.2 is still only for vetted cyber and life-science groups. Source
Fable 5.2 machine-checked Fermat’s Last Theorem in 30 hours A team of 1,000 Fable 5.2 agents wrote out the whole proof in Lean, a language a computer uses to check every step, with little human help. Opus 5.5 got about a quarter of the way in the same setup. Anthropic’s first go at it, with an unreleased model, took 11 days, and it put this one out on Monday. Source
Anthropic pulled the $70 to $80 IPO price it emailed bankers Reuters says Monday’s email put 867 million shares on offer, enough to raise up to $69.3bn, before Anthropic retracted it and said the correct pricing would follow soon. The Wall Street Journal says Anthropic still wants to start trading late next week, though it could yet delay. Source
Meta’s new Muse Ember costs 10 cents per million tokens in It’s built for the repetitive work agents do all day, like tool calls and coding subtasks, and it went live on Meta’s API on Monday at 50 cents per million out. Meta’s own figures put it level with Claude Haiku 5.5 on Artificial Analysis’s overall score at about a third of the cost per task. Source
Anthropic is spending $3.4bn on 1.7 gigawatts of gas generators The Financial Times reported on Sunday that it’s taking over a Caterpillar order that equipment supplier OnePWR placed a couple of years ago but couldn’t get the money together for. Anthropic has mostly rented its computing power rather than buying the kit itself. Source
Fireworks AI got hacked again, and some model weights leaked The AI hosting company told customers on Monday that intruders got in through a cloud provider on 24 October and reached billing data. For a limited set of accounts they also got stored secrets, datasets and incomplete model weights. Bloomberg says it’s Fireworks’ second breach in a few weeks. Source
Apple is now selling $49.99 packs of extra AI usage It’s the first time Apple has charged for Apple Intelligence, and so far the packs are only in Logic Pro, kicking in once you hit the monthly limit. 9to5Mac spotted them on Monday. They roll over month to month and expire after a year. Source
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