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Anthropic released the Claude Fable 5.1 and Claude Mythos 5.1 AI models with updated pricing and restricted availability for vetted organizations.

Model release ● Confirmed 86% confidence first seen

Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1 as new models for coding and knowledge work, with restricted availability for vetted organizations. The company cut cache-read pricing substantially, but coverage reports that output token usage increased, leading to roughly higher overall per-task costs in some scenarios despite performance improvements.

Anthropic Claude Fable 5.1 Claude Mythos 5.1 OpenAI Apple Artificial Analysis Astra

Source coverage

Fable 5.1: The New Best AI Model Is Once Again More Expensive Trending Topics independent [AINews] Claude Fable/Mythos 5.1: new SOTA model, 75% cache price cut but 70% more output tokens Latent Space newsletter 😺Anthropic launched Fable 5.1: and now, the agents cost less The Neuron newsletter Fortune Tech: Anthropic Fable and Mythos 5.1, OpenAI Astra limits, AI token tax Fortune independent

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