Anthropic Launches Claude Fable 5.2 and Claude Mythos 5.2

What happened

Anthropic announced Claude Fable 5.2 and Claude Mythos 5.2, claiming improvements in coding, reasoning, and vision, with faster output than the 5.1 versions. The company says Fable 5.2 can handle challenging software engineering problems and long-running projects; it is launching today. Access to Mythos 5.2 will initially be limited to vetted organizations. Anthropic also cited prerelease examples including software migrations, electronic devices, and open physics problems.

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Reported by 6 sources

The story so far

Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, lowering API prices to $8 per million input tokens and $40 per million output tokens, from $10 and $50. Anthropic says both models improve coding, reasoning, and vision, and that Fable produces responses faster than version 5.1. Fable is available to paid users with safeguards for risky cybersecurity and biology tasks; Mythos is limited to organizations approved through Anthropic’s verification programs. The launch reports cite strong benchmark results, including Fable’s first-place score on Artificial Analysis’ Intelligence Index v5 at its highest compute tier. Those figures come from the named benchmark evaluations; Anthropic’s prerelease examples also include software migrations, electronic devices, and physics problems. TechCrunch reports that an optional faster serving mode costs twice as much, while the lower API prices apply to standard use.