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Anthropic released updated Claude Fable 5.1 and Mythos 5.1 models with revised pricing, access limits, and additional safety and watermark-detection features

Model release Provisional 78% confidence first seen

Anthropic released Fable 5.1 and Mythos 5.1 as updated versions of its flagship Claude models. Coverage says Fable 5.1 is cheaper and broader available while Mythos 5.1 remains limited to trusted access, alongside updated safety behavior and a private-preview watermark detection API.

Anthropic Claude Fable 5.1 Claude Mythos 5.1 Fable 5.1 Mythos 5.1 Ben Enterprise Frontier Safeguards The New Stack watermarks detection API

Source coverage

Anthropic’s Fable 5.1 is a bit cheaper, a bit smarter, and refuses a lot less The New Stack Anthropic’s new Fable release is cheaper, less restrictive TechCrunch independent Fable 5.1 Ben's Bites

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