Anthropic releases Claude Fable 5.1 and Mythos 5.1, cutting cache read prices by 75%
Anthropic has released Claude Fable 5.1 and Mythos 5.1, the same model with different safeguards, cutting cache read prices by 75% and reporting 52.6% on a scientific research benchmark against 24.7% for its predecessor. Its outputs carry a watermark required by the EU AI Act, and the detection API is in private preview for eligible organisations.
Anthropic has released two new Claude models. Fable 5.1 and Mythos 5.1 are the same model with different safeguards, the company said.
Only one of them is generally available. Mythos goes to vetted users through two access programmes covering cybersecurity and the life sciences. Anthropic says the biology programme was built with the US government.
The developer headline is price. Cache reads fall 75% to $0.25 per million tokens, cutting typical workload costs by about 25% and agentic ones by up to 45%.
The benchmark jump is large on Anthropic’s own numbers. Fable...
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