Anthropic Upgrades Claude Fable and Mythos Models With Faster Coding, Lower Costs

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Anthropic has released Claude Fable 5.2 and Claude Mythos 5.2, two upgraded artificial intelligence (AI) models designed for complex software engineering, scientific research and technical problem-solving. The models generate responses up to 30% faster than their predecessors, while their standard application programming interface (API) pricing has been reduced by 20%.

Announced on November 9, 2026, the models share the same underlying architecture but differ in their availability and safeguards. Claude Fable 5.2 is available across Anthropic’s platforms, while Mythos 5.2 is restricted to verified organisations working in cybersecurity and biomedical research.

Anthropic said the upgrades bring improvements in coding, reasoning and visual understanding. The company also reported progress in areas such as robotics, hardware engineering and mathematical research during pre-release testing.

What are Claude Fable 5.2 and Mythos 5.2?

Claude Fable and Claude Mythos are Anthropic’s models for demanding, open-ended technical work. They are designed to handle complex tasks that...

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