Devin Fusion Scores 68 on the Coding Agent Index at 31% Lower Cost per Task

What happened

Devin Fusion with Claude Opus 5.5 (max) and a GPT-6 Luna (high) sidekick scores 68 on the Coding Agent Index, 2 points above Claude Code with Opus 5.5 (max) at 31% lower cost per task @cognition's Devin Fusion runs a frontier lead model alongside a lower-cost sidekick model. The

The story so far

Artificial Analysis reported that Cognition’s Devin Fusion, running Claude Opus 5.5 (max) with a GPT-6 Luna (high) sidekick, scored 68 on the Coding Agent Index—two points above Claude Code with Opus 5.5 (max), at 31% lower cost per task. Devin Fusion pairs a frontier lead model with a lower-cost sidekick model. The reported score and cost advantage apply to this specific configuration and benchmark comparison.

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