Claude Fable 5.2 and Mythos 5.2 claim 30% faster output at lower prices

Anthropic released Claude Fable 5.2 and Mythos 5.2 on November 9. They share one underlying model: Fable adds stronger cyber and biology safeguards for general availability, while Mythos is limited to organizations approved through Cyber or Life Sciences verification. Anthropic says the releases generate up to 30% faster and now cost $8 per million input tokens and $40 per million output tokens. An optional fast mode raises speed by up to another 2.5 times at double the token price. The company also reports testing across roughly 1,900 behavioral scenarios and more than 1,800 adversarial sandbox scenarios, but its benchmarks and scientific examples remain vendor claims requiring independent replication.