Devin is an autonomous AI software engineer developed by Cognition AI. It operates as a fully capable coding agent that can independently plan, write, debug, and deploy code within its own cloud-based IDE environment. Devin 2.0 introduced interactive planning, allowing developers to collaborate on task scoping before execution. It features Devin Search for agentic codebase exploration with cited answers, and Devin Wiki that automatically indexes repositories to create detailed documentation with architecture diagrams. Users can spin up multiple Devin instances in parallel, each working autonomously while allowing human intervention at any point. The platform integrates with Slack, Microsoft Teams, and GitHub for seamless workflow integration. Devin uses Agent Compute Units (ACUs) as its billing metric, where 1 ACU equals approximately 15 minutes of active work. Devin 2.0 completes over 83% more junior-level development tasks per ACU compared to its predecessor, making it significantly more cost-effective.