Anthropic's Claude Opus 5.5 beat Gemini 4 Carbon on Artificial Analysis' Coding Agent Index in October 2026, 62 to 59

Google DeepMind's frontier AI model, released on October 28, 2026, two weeks after Gemini 4 Argon's wide rollout, first only to selected cybersecurity defenders through Google's Fairwind Program; it ranked first on the Artificial Analysis Intelligence Index v5 with a score of 59.