Anthropic releases Fable 5.1 and Mythos 5.1 with reduced token costs and fewer safety false positives

According to TechCrunch, Anthropic released Fable 5.1 with 25% lower token costs and up to 45% reduction for agentic tasks, and Mythos 5.1 with stronger performance and fewer false-positive safety restrictions. The releases address customer complaints about pricing and overzealous safeguards in prior versions.

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• Press

[Read article](https://techcrunch.com/2026/09/01/anthropics-new-fable-release-is-cheaper-less-restrictive/) - Press
[Read article](https://www.theverge.com/ai-artificial-intelligence/987830/anthropic-claude-fable-mythos-5-1)

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