Fusion
Multi-agent coding architecture pairing a frontier 'lead' model (planning/review) with a cost-efficient 'sidekick' (execution), up to 39% more efficient than other coding harnesses on major benchmarks; available now in Devin Desktop and Devin CLI.
Not separately priced: Fusion is a harness shipped inside Devin that changes Devin's own token cost (reported 36-39% savings vs. single-model use); no independent Fusion fee. Whether a recurring free tier exists is not stated either way.
What it does
- Agentic coding
Sources
- Description
- What it does
- Sold within
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Announcement: 'Fusion is now available in both Devin Desktop and Devin CLI' -- a named harness shipped inside the existing devin/devin-desktop products, not sold on its own.
- Name
- URL
- Interfaces
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Official documentation · 28 Sep 2026
Page gives the Devin CLI install command and is titled Introducing Fusion in Devin Desktop & CLI.
Also from Cognition
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Devin AI agent
Autonomous coding agent that plans, writes, tests and ships code from a task description.
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Devin Desktop Developer tool
Desktop coding environment running Devin's agents locally, including custom background agents that carry a team's context between sessions.
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Devin CLI AI agent
Local command-line coding agent that runs in the developer's terminal against local files, with Devin Cloud integration; bundled with Devin Desktop and presented by Cognition as a separate tool from the cloud-based Devin.
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