Anthropic launches Claude Fable 5.2 and Mythos 5.2 models with improved performance and lower cost

Anthropic announced the release of two new AI models, Claude Fable 5.2 and Claude Mythos 5.2, designed to address complex technical challenges, according to The Verge.

The company claims these models show improvements in coding, reasoning, and vision, and can generate outputs faster than previous versions, with Fable 5.2 being 30% faster and priced 20% below OpenAI's GPT-6 Astra, Fortune reported.

During prerelease testing, the models helped engineers complete difficult software migrations, design electronic devices, solve open physics problems, and formalize a mathematical proof, The Verge noted.

Anthropic also emphasized that Fable 5.2 supports zero data retention policies, appealing to enterprise clients, and that Mythos 5.2 will initially be available only to vetted organizations, according to TechCrunch.

The release follows a third-quarter revenue slowdown for Anthropic and comes amid discussions about AI capabilities such as recursive self-improvement, with the company maintaining that Mythos 5.2 does not act covertly against users, TechCrunch added.