Claude Fable 5.1 Tops Agent Arena With +15.8% Net Improvement, #1 in Praise Ratio
arena · x · 2026-09-06
The Agent Arena leaderboard now ranks Claude Fable 5.1 #1 overall, with a net improvement of +15.8%. Breakdown by signal:
- Praise vs. Complaint: #1 (+42.5%)
- Confirmed Success: #1 (+22.4%)
- Bash Recovery: #4 (+13.1%)
- Steerability: #28 (+0.6%) — its weakest area
- Tool Hallucination: no reported issues
The model clearly leads on user sentiment and task success, though steerability lags well behind.
Related event: Claude Fable 5.1 Tops Agent Arena Leaderboard(3 posts)→
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