Watch Devin Fusion work:
The sidekick model handles fetching information and skimming sources.
The frontier model makes a plan for implementation, then delegates well-scoped sub-tasks to the sidekick with its own cached context.
Conventional model routing sucks. It passes benchmarks but fails to write code you'd actually merge.
Introducing Devin Fusion, a new hybrid-model harness for agentic coding.
In testing, it reduces the cost of Fable-level intelligence by 35% and still feels good to use.