Devin Fusion brings paired coding agents to Desktop and CLI
Cognition made Fusion available in Devin Desktop and CLI. A frontier lead model plans and reviews while a lower-cost sidekick explores, implements and tests in a separate persistent context; users select both models, with Cognition recommending Fable 5.1 plus SWE-2.
Why it matters: The release moves a two-agent coding harness from Devin Cloud onto local developer surfaces. Delegation can reduce frontier-model spend, but it creates two contexts, two tool users and a review handoff that must be evaluated as one system.