Cosine

Cosine

Cosine is the company behind Genie, an autonomous AI software engineer that takes a ticket, writes and tests code, and opens a pull request. Cosine connects to GitHub plus issue trackers like Jira and Linear, then plans a change, edits code, runs tests, and raises a PR — autonomously or alongside a developer. Genie was trained on data modeling how real engineers reason, not only on finished code, and in 2024 it posted a then-leading score on the SWE-bench benchmark. Cosine has since added its own Lumen coding models, including on-device and air-gapped variants.

Production credibility: Y Combinator-backed (founded 2022, San Francisco and London) with reported seed funding from investors including Soma Capital. Genie drew wide attention in August 2024 for posting roughly 30% on SWE-bench, the highest by any company at the time. Cosine was later named in the UK government's Sovereign AI initiative, with design-partner agreements reported from firms including HSBC, NatWest, and BAE Systems.

Key Features

• Resolves issues end-to-end: plan, write code, run tests, open a pull request
• First-class GitHub, Jira, Linear, and Slack integrations for ticket intake
• Trained on data capturing human engineering reasoning, not just final diffs
• Works autonomously or collaboratively with a developer in the loop
• Lumen coding models with on-device (Scout) and air-gapped deployment options
• Terminal and CLI access with MCP tool support

Ideal Use Case

Engineering teams that want to offload well-scoped tickets — bug fixes, small features, test coverage — to an autonomous agent that delivers a reviewed pull request, and regulated organizations that need on-device or air-gapped coding models.

How Cosine differentiates

Devin is the best-known autonomous software engineer; Cosine's Genie competes directly and made its name by topping SWE-bench in 2024. Genie leans on training data that captures engineering reasoning and integrates tightly with Jira, Linear, and Slack for ticket intake. Its Lumen models add a path most rivals lack — on-device and sovereign, air-gapped deployment — which is why UK banks and defense firms engaged it as design partners. Genie and Lumen are proprietary, not open source.

FAQ

Q: What is Cosine's Genie? A: Genie is an autonomous AI software engineer from Cosine that takes a ticket from GitHub, Jira, or Linear and delivers working, tested code as a pull request, working solo or with a developer in the loop.

Q: Cosine Genie vs Devin? A: Both are autonomous software engineers. Genie emphasizes training on human engineering-reasoning data, made headlines for topping SWE-bench in 2024, and offers on-device and air-gapped model deployment via its Lumen line.

Q: Is Cosine open source? A: No — Cosine is a Y Combinator-backed company and its Genie agent and Lumen models are proprietary. The models are not open source.

Q: What is Lumen? A: Lumen is Cosine's family of coding models that power Genie, including on-device (Scout) and sovereign, air-gapped variants for regulated industries.

tl;dr

Cosine's Genie is an autonomous AI software engineer that takes a ticket from GitHub, Jira, or Linear and ships tested pull requests. It made headlines topping SWE-bench in 2024 and now runs on Cosine's own Lumen models, including on-device and air-gapped variants. YC-backed; named in the UK Sovereign AI initiative. A direct alternative to Devin.