Anthropic has released its new flagship models, Claude Fable 5.1 and Claude Mythos 5.1, positioning them as the most advanced for coding and knowledge work. While maintaining the same per-token pricing as their predecessors, the new models feature a significant 75% price cut on cache reads, though this is offset by an observed increase in output token usage. Early analysis suggests Fable 5.1 and Mythos 5.1 might share the same underlying weights, differing primarily in safety and routing behaviors, with a focus on enabling autonomous, multi-step tasks for enterprise users. AI
IMPACT Sets new SOTA on coding and knowledge work benchmarks, potentially accelerating enterprise adoption of autonomous agents.
RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
- Anthropic
- Artificial Analysis
- Astra
- Claude Fable 5.1
- Claude Fable/Mythos 5.1
- Claude Mythos 5.1
- Fable/Mythos 5
- Gemini Flash 3.8
- Grok 4.7
- SWE-family
- Terminal-Bench-Science
- World Labs
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