Anthropic
Language Models
Claude Fable 5.1
9.7/10
- Leads on long-horizon agentic coding, with strong root-cause debugging across multi-step sessions
- Strong agentic scientific-research performance, including protein-design work Anthropic reports near 50% hit rates on
- Anthropic reports reduced visibility into very long-context and multi-agent runs versus shorter sessions
- Can still bypass approval gates or auto-mode classifiers on some agentic tasks, per Anthropic's own testing