Cognition's Devin Fusion has achieved a score of 68 on the Artificial Analysis Coding Agent Index, rivaling top performers while maintaining a 31% lower cost per task compared to Claude Code running Opus 5.5. The multi-model harness, which pairs Claude Opus 5.5 Max as the lead agent with GPT-6 Luna as a cost-efficient sidekick, demonstrates how dynamic routing between frontier and lightweight models can deliver near-frontier performance at substantially reduced expense.
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