Claude Fable 5.1 Tops Agent Arena Leaderboard

Anthropic's Claude Fable 5.1 (Max) tops the Agent Arena leaderboard with a +15.8% net gain, though its $4.14 per-task cost is the highest; Arena has since published full subcategory breakdowns.

2026-09-06 ~ 2026-09-06 · 3 related posts

• Claude Fable 5.1 Tops Agent Arena With +15.8% Net Improvement, #1 in Praise Ratio — arena · 2026-09-06
• Agent Arena Publishes Full Leaderboard Details for Claude Fable 5.1 Rankings — arena · 2026-09-06
• Claude Fable 5.1 tops Agent Arena at $4.14/task median cost with +15.8% net gain — arena · 2026-09-06