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Mike Krieger Announces Claude Fable 5.2 and Mythos 5.2

Mike Krieger · XRelayed· @mikeyk·· 3 days ago

3.6K views · 56 likes · 4 reposts (at collection)

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Who
Anthropic
What
released Claude Fable 5.2 and Claude Mythos 5.2
When
Quote
Claude Fable 5.2 and Mythos 5.2 are out today!

What happened

Mike Krieger says Claude Fable 5.2 and Mythos 5.2 are out today. He describes Fable 5.2 as sharp on complex problems and says researchers working with it solved two theoretical physics problems. Krieger also says he pairs Fable with Opus 5.5 for strategy work.

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See the full storyAnthropic Releases Claude Fable 5.2 and Mythos 5.2 with Lower API Prices

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    Article

    Claude Fable 5.2 and Mythos 5.2 are out today!

    They’re super sharp to work with. On complex problems you can really feel the extra intelligence; researchers working with Fable 5.2 solved two problems from theoretical physics.

    Fable is also a great thought partner on strategy, paired with Opus 5.5 for a lot of my work.

    Can't wait to see how you use Fable 5.2 to bring your big ideas to life!

    Quoted postClaude@claudeai

    Introducing Claude Fable 5.2 and Claude Mythos 5.2, designed to tackle the most daunting technical challenges.

    They’re capable collaborators on ambitious projects in many fields, and show improvements in areas like coding, reasoning, and vision.

    View the quoted post on X

    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.

    Anthropic / ClaudeReasoningModel releases