Jules
Google's async autonomous coding agent powered by Gemini 2.5 Pro. Integrates with GitHub — assign it a task, it runs in a sandboxed VM, and returns a diff or PR. GA since August 2025. Competes directly with Devin and GitHub Copilot Workspace.
Devin
Cognition's autonomous AI engineer that plans, codes, tests, debugs, and opens PRs unattended. Now shipped alongside Windsurf (acquired July 2025) as the async half of Cognition's stack — Devin runs async tasks, Windsurf is the in-editor surface.