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Anthropic's Claude Fable 5.1 and Mythos 5.1 arrive with a 75% cost reduction for Fable cache reads
Anthropic launched Claude Fable 5.1 and Mythos 5.1, cutting cache read costs by 75% for enterprises to boost model efficiency.
What: Claude Fable 5.1 is now generally available, while Mythos 5.1 is restricted to cybersecurity and life-sciences partners. Fable 5.1 input tokens cost $10 per million, with output tokens at $50 per million.
Why it matters: This shift emphasizes cost-optimization as a critical feature for enterprise adoption of long-context models, focusing on minimizing redundant processing via caching.
Decoder
- Cached context: Storing parts of a prompt or document so the model does not need to re-process static information, significantly lowering latency and cost.
Original article
Claude Fable 5.1 is now generally available, and Mythos 5.1 is available through restricted-access programs for vetted cybersecurity and life-sciences organizations. Anthropic has reduced the cost of cached context by 75% and introduced a new security architecture designed to let organizations retain monitoring data inside infrastructure they control. Fable 5.1 costs $10 per 1 million input tokens and $50 per million output tokens, but the cached price reduction will make a big difference for price-conscious enterprises.
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