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Anthropic releases Claude Fable 5.2 and Mythos 5.2, its top AI models, 20% cheaper

Anthropic launched Claude Fable 5.2 and Claude Mythos 5.2, new versions of its two flagship models. It says they are better at coding, reasoning and vision, and that they write answers up to 30% faster than the 5.1 versions. The New Stack reports that both cost $8 per million input tokens and $40 per million output tokens, 20% less than 5.1. A faster mode costs $16 and $80. Anthropic also says that in testing before release the models wrote a formal, machine-checked version of the proof of Fermat's Last Theorem and solved two open physics problems about black holes. GitHub says Fable 5.2 is now available in its Copilot coding assistant for paid plans. TechCrunch notes the release comes amid concerns about AI that can speed up its own development.

Hype check: The lower price is concrete. The maths and physics results are Anthropic's own claims from internal testing and have not been checked by others yet.
Company claimAnthropic