Devin

Devin is an autonomous AI software engineer built by Cognition AI, introduced in 2024 as the first AI agent capable of completing end-to-end software engineering tasks — including writing code, running tests, debugging, and deploying changes — without human guidance on each step.

Devin 2.0, launched in late 2025 and widely adopted through 2026, represents a major capability leap. On Cognition's internal ACU (Agent Compute Unit) benchmark, Devin 2.0 completes 83% more junior developer tasks per unit of compute compared to Devin 1.0. This translates to meaningfully more work completed per dollar spent, not just raw capability improvement.

The pricing restructure is the most dramatic change in Devin's history. The original plan cost $500 per month, limiting adoption to well-funded engineering teams. Devin 2.0 introduced a Core plan at $20 per month — a 96% price reduction — making autonomous AI engineering accessible to individual developers and small teams for the first time. The Team plan at $500 per month includes 250 ACUs with additional ACUs billed at $2 each. Enterprise pricing is custom for large organizations with compliance and SLA requirements.

Devin integrates with Windsurf's Kanban dashboard, allowing teams to manage AI agent tasks alongside human developer tasks in a unified project view. This positions Devin as a collaborative team member in project management tools rather than a standalone CLI-only tool.

Devin works best on well-defined tasks with clear acceptance criteria — bug fixes from GitHub issues, adding tests to existing code, implementing a specified API endpoint, or updating dependencies. It struggles with open-ended architectural decisions and tasks that require deep product context not captured in the codebase.

Best for engineering teams that want to offload routine junior-level tasks to an AI agent, and for individual developers who want an autonomous assistant at a consumer price point.