Cosine combines static analysis, semantic search, and multi-agent reasoning to understand a codebase well enough to answer natural-language questions about it, suggest code, and modify it with a meaningful degree of autonomy. It integrates with GitHub, VS Code, Jira, Linear, and Slack, aiming to fit into an existing team workflow rather than requiring a separate standalone interface.
Its core feature is Genie, an autonomous agent built on GPT-5 that can plan, implement, test, and commit pull requests for bug fixes and new features based on written instructions, closer in spirit to Devin or OpenHands than to a completion-style assistant. Rather than a flat subscription, Cosine prices on a task-based model, aiming to align cost directly with what actually gets delivered instead of charging for API calls regardless of outcome.
That outcome-based pricing is a meaningful bet: it only works well if Genie reliably completes tasks it's assigned, since a task-based price only looks attractive if the task actually gets done.