Anthropic Launches Claude Fable 5.2 and Claude Mythos 5.2
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.
Context
A frontier Claude release changes what builders can ship today on coding, reasoning, and vision tasks.
Claude posted the official launch of Fable 5.2 and Mythos 5.2 as models aimed at hard technical work, with gains cited in coding, reasoning, and vision. Anthropic also posted that both models are available now. Artificial Analysis later said Fable 5.2 took the top spot on its Intelligence Index v5 at a max effort score of 65.
Deep dive
Anthropic's Claude account introduced Claude Fable 5.2 and Claude Mythos 5.2 as models built for difficult technical work, saying they improve coding, reasoning, and vision. The launch post is the official lead for this deck.
Anthropic's company account followed with a short availability notice that both models are available now. Later Claude posts in the same thread said Fable and Mythos are the same underlying model, with Fable carrying stronger safeguards, while Mythos access for cybersecurity or biomedical work goes through Anthropic's Life Sciences and Cyber Verification Programs.
Claude also said Fable 5.2 is on paid plans and major clouds at $8 per million input tokens and $40 per million output tokens, down from $10 and $50. Artificial Analysis reported Fable 5.2 at number 1 on its Intelligence Index v5 with a max effort score of 65, ahead of Gemini 4 Carbon high at 60 and Claude Opus 5.5 max at 59.
Follow up Claude posts claimed demo results such as designing working electronics from a short prompt and solving selected theoretical physics calculations. Those claims come from Anthropic's own launch posts and were not independently rechecked in this scan.
What to expect next
Watch independent evals beyond Artificial Analysis, Mythos access decisions, and whether Opus remains the daily driver Anthropic recommends for most coding work.