Agent Arena: Claude Opus 5.5 tops agent leaderboard; first 14 spots all proprietary
arena · x · 2026-10-14
Agent Arena updated its leaderboard with a new Bash Reliability signal. Top 5: Claude Opus 5.5 (Max), GPT-6.1 Sol (Max), Claude Fable 5.1 (Max), GPT-6 Astra (Max), Gemini 4 Argon (High) — Anthropic and OpenAI sweep the top four. All top 14 models are proprietary; the best open-weights entries are GLM 5.2 at #15 and MiMo V2.6 Pro at #18. Opus 5.5 leads with +16.8% net improvement.
Related event: Agent Arena Update: Claude Opus 5.5 Tops Ranking as Bash Reliability Debuts(6 posts)→
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