Devin Fusion with an Opus 5.5 lead and GPT-6 Luna sidekick edges Muse Code for #1 on the AA Coding Agent Index
The pairing scores 68.1 on Artificial Analysis's Coding Agent Index v1.5 (DeepSWE 72.6, Terminal-Bench 4 62.1, SWE-Atlas-QnA 69.6) at $9.01 and about 55 minutes per task, effectively tied with Muse Code on Muse Wonder Full at 68.0. Cognition says that's 31% cheaper per task than Claude Code with Opus 5.5, a vendor claim, and you can try it now in Devin CLI and Desktop (Cognition).