Claude Fable 5.2 even managed to build a working operating system from scratch, coordinating over 1,000 AI agents. Anthropic
Anthropic has introduced two of its most powerful AI models yet, Claude Fable 5.2 and Mythos 5.2, just over two months after launching their 5.1 versions. According to the company, the new models are considerably better at coding, reasoning, and scientific research. They can also generate responses up to 30% faster than their predecessors, while costing less to run. Anthropic has also shared some pretty impressive examples of what the new models have managed to accomplish.
Fable 5.2 posts massive improvements across key benchmarks
Based on benchmark figures released by Anthropic, Fable 5.2 scored 49.1% on FrontierCode 2.0, a big jump from Fable 5.1’s 32.4%. It also raced ahead on scientific research tasks, scoring 74.6% against its predecessor’s 52.6%. The biggest improvement, however, came in robotics simulations, where its score jumped from 27.6% to 64.9%.
In early testing on FrontierCode 2.0, Fable 5.2 at High effort scored about level with Opus 5.5 at Max effort, for roughly half the cost per task. At Xhigh effort, it scored the highest of any released model tested.
