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The new models optimize for complex, long-running tasks and scientific research. Fable 5.1 recorded a 52.6% score on Terminal-Bench-Science 0.1, more than double the performance of Fable 5, and 55.8% on Terminal-Bench 4.0 against 42.0% for its predecessor. These performance gains accompany a 75% reduction in cache read costs, which lowers the total price by 25% for typical usage and 45% for agentic workloads.
Enterprise Frontier Safeguards (EFS) introduce zero data retention for corporate clients to maintain privacy while blocking adversarial use. This security feature begins a phased rollout this fall. Anthropic positions the Fable and Mythos 5.1 models as the world's most advanced available tools for coding and knowledge work.
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Key sources
- SOURCE@claudeai“the world’s most advanced models for coding and knowledge work”x.com
- SUPPORT@claudeai“scores 55.8% on Terminal-Bench 4.0 against 42.0% for Fable 5”x.com
- SUPPORT@claudeai“up to 45% for highly agentic ones”x.com
- SUPPORT@claudeai“give enterprise customers complete privacy (the same as zero data retention)”x.com
- SUPPORT@claudeai“excels at complex, long-running tasks”x.com
- SOURCE@sarahzorah“the world’s most advanced models for coding and knowledge”x.com
- SUPPORT@btibor91“Mythos 5.1 produced protein binders with binding affinities 10 times higher than the best designs”x.com
- SUPPORT@wesroth“Detection requires Anthropic’s API”x.com