Cosine Genie

Paid

Autonomous AI software engineer (Genie) trained to retrieve from large codebases, plan, edit, and iteratively test changes.

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Our take

A specialist autonomous coding model that posted category-leading SWE-bench results, built to work through bugs and features with iterative self-testing.

Best for

Developers wanting an autonomous agent that reasons over large codebases and tests its own changes before handing back.

Pros

Genie model posted strong SWE-bench scores, ahead of several rivals
Retrieves context from large codebases and plans solutions
Iteratively tests changes before returning to the user
Works autonomously or alongside a developer

Cons

Access oriented to a managed product rather than open-source
Best on mainstream languages (JS, Python, TypeScript)
Autonomous edits require review on complex work

How it compares

Versus Devin, Cosine's Genie reported markedly higher SWE-bench resolution; versus Cursor, it is an autonomous engineer rather than an assisted editor.

Full review

Cosine builds Genie, an autonomous software-engineering model trained specifically on how expert engineers work: retrieving relevant code from large repositories, planning a solution, making changes, and iteratively testing them.

The company, a Y Combinator startup, drew attention when Genie outscored agents like Devin and others on the SWE-bench benchmark, positioning it as a specialist rather than a general chatbot.

Genie can run fully autonomously or collaborate with a developer on bug fixes, feature builds, and refactors, with the strongest results on widely used languages.