Devin
Cognition AI's "autonomous AI software engineer" — receives a task, plans, runs shell commands in a sandbox VM, debugs and delivers a PR.
Launched March 2024 with a viral demo. The first to ship "agentic coding" as a launchable product rather than a demo. Its SWE-bench results (13.86 % unassisted) kicked off the entire "AI software engineer" wave. Cognition acquired Windsurf in 2025 in a turbulent deal.
Criticised for marketing overselling the reality. Competitors: OpenHands (open source), SWE-agent, Cody, Codeium Windsurf Agent. The industry is still unsure whether "autonomous" agents beat assistance-focused tools like Cursor/Aider.