Anthropic Will Keep Agent Arena No.1 Title

Anthropic will have the best AI agent at the end of November 2026 when the Agent Arena Leaderboard is checked on November 30, 2026. Anthropic’s Claude Opus 5.5 (Max) held the #1 rank on October 28 with a Net Improvement of 20.09%±2.53% across 7,707 sessions, and those are the concrete numbers chall…