Claude Opus 5.5 Leads Agent Ranking as Gemini Tops Text List

Claude Opus 5.5 led an agent-task ranking dated Oct. 16, while Gemini 4 Argon topped a separate text-preference list the day before, showing how model standings vary with the work being measured. Opus 5.5 (Max) scored an estimated 18.88 percentage points above a randomized average-model baseline, based on 10,551 sessions. The snapshot covered 2,534,501 sessions across 52 models. The score measures estimated improvement against that baseline; it is not an 18.88% task-completion rate or the share of users who preferred Opus. Its 95% confidence interval ran from 16.14 to 21.62 points. The overall agent score gave equal weight to five signals: confirmed task success, praise versus complaints, steerability, Bash reliability and tool hallucinations. Opus 5.5’s estimated gains were 20.31 points for confirmed success and 39.93 points for praise versus complaints.

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