This is a neat idea around doing model routing and sub-agent delegation while ensuring cache hits on accumulated context for all agents. It …

This is a neat idea around doing model routing and sub-agent delegation while ensuring cache hits on accumulated context for all agents. It makes a lot of sense: you want to ensure that all subagents can also make use of accumulated context in their cache Devin Fusion uses a hybrid-model harness built around two ideas: First, a “sidekick” agent: a smaller agent runs in parallel with the frontier agent. The frontier agent delegates work, monitors progress, and keeps ownership of planning, ambiguity, and final review. This lets Fusi…

Source: Jerry Liu (X) | 2026-06-29