Pick what matters most and we’ll highlight the leader. Then flip Argon to its Dec. 1 price.
Test score and cost per task: Artificial Analysis Intelligence Index, mid-October 2026. Opus 5.5 at its maximum setting; at “high” it scores 54 for about $1.82 a task. List prices are per million tokens, in / out, from each company. Longest answer is each model’s maximum output through its developer API (Argon needs Google’s long-decode setting). Argon’s Dec. 1 cost per task is our estimate: same work, double the price.