Engineering teams with heavy agent bills might try it to cut model costs, but it's still a preview and the cost claims are Cognition's own.
Kenning's take
What it does
Devin Fusion is a multi-model setup from Cognition that runs two agents side by side, a frontier model that plans and reviews and a cheaper sidekick model that does much of the work. It can also switch models partway through a session. Cognition says it keeps near-frontier scores on its FrontierCode benchmark at up to 60% lower cost, and it is in preview in Devin.
- Main agent plus a cheaper sidekick agent
- Dynamic routing between models mid-session
- Up to 60% lower cost on FrontierCode, per Cognition
- Available in preview through Devin
Who it suits. Engineering teams who use AI coding agents heavily and want to lower model costs.
Key facts
- Category
- Developer tools
- Made by
- Cognition
- Released
- 29 June 2026
- How to get it
- preview, by signing up at app.devin.ai
- Works on
- Web
FAQ
What is Devin Fusion?
A Cognition harness that pairs a frontier model with a cheaper sidekick model so coding agents cost less while keeping quality close to the top models.
When was Devin Fusion announced?
Cognition announced it on 29 June 2026.
How do I try Devin Fusion?
Cognition says it is in preview for people who sign up at app.devin.ai.
Facts from the maker's own pages and the sources listed. Checked 2026-10-11.
Similar tools
Claude Keychain
A free Mac menu bar app that keeps API keys in the macOS Keychain so Claude Code can use them without seeing them.
OpenAI Agent Builder
OpenAI's visual canvas for building multi-agent workflows, being withdrawn on 30 November 2026.
ElevenLabs Agent Workflows
Visual editor in ElevenLabs' agent platform for designing branching conversation flows for voice and chat agents.
AgentOps
Monitoring and debugging platform that records what AI agents do, what they cost and where they fail.