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[TECHNOLOGY] · United States, Japan, EU · 85 sources

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Anthropic launches Claude Fable 5. 1 and Mythos 5. 1 models

Anthropic has released Claude Fable 5. 1 and Claude Mythos 5. 1, two versions of the same underlying model with different safety protocols. Fable 5. 1 is generally available for commercial use, while Mythos 5. 1 is restricted to vetted organizations in cybersecurity and life sciences.

The update focuses heavily on economic efficiency. While base token prices remain at $10 per million input and $50 per million output, Anthropic has reduced cache read costs by 75% to $0.25 per million tokens. This reduction is expected to lower typical workload costs by 25% and agentic task costs by up to 45%.

Performance improvements include higher scores in technical benchmarks, such as achieving 55.8% in Terminal-Bench 4. 0. The new models also feature more precise safety guardrails, reducing false positives in cybersecurity by approximately 60% and in biology by 85%. Additionally, Anthropic has introduced invisible watermarking for text and digital signatures for images to comply with regulations like the EU AI Act.

Entities

AWS · Amazon Bedrock · Amazon Web Services · Anthropic · Claude · Claude Fable 5. 1 · Claude Fable 5. 1 · Claude Fable 5.1 · Claude Mythos 5. 1 · Claude Mythos 5. 1 · Claude Mythos 5.1 · Google Cloud

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