Cosine
Agentic AI software engineer producing reviewable, controlled code
Last reviewed 2026-06-18
Cosine builds an agentic AI software-engineering system for professional teams that need maintainable, reviewable code. The agent runs a multi-stage loop, research, plan, implement, verify, and handoff: it maps a repository, scopes work into steps, makes targeted changes, runs tests, and hands off a diff with evidence for human review. It runs across a CLI, a desktop workbench, and a cloud mode for async parallel work, powered by Cosine's proprietary model. Cosine drew attention in 2024 when its model, originally branded Genie, posted a company-reported SWE-bench result. Since then the model family was rebranded (to Lumen) and the company expanded toward a UK sovereign-AI initiative; the Genie name is best treated as legacy. The coding product remains available. Benchmark figures it cites are company-reported and did not appear on the official SWE-bench leaderboard.
What it can do
Map and research a codebase
SupervisedAnalyzes a repository to understand structure and context before scoping work, with no human input required for this step.
sourcePlan and implement changes
SupervisedScopes a task into steps and makes targeted code changes, executing autonomously against a human-approved scope.
sourceVerify via tests and hand off a reviewable diff
SupervisedRuns tests and ends with a handoff stage delivering a diff plus evidence for a human to review and merge.
sourceRun work async in parallel (Cloud)
SupervisedExecutes multiple tickets in parallel in a cloud mode, with humans reviewing the resulting diffs.
source
Strengths
- +Built for review and control: a diff-plus-evidence handoff fits real merge workflows
- +Proprietary, purpose-trained model rather than a thin wrapper
- +Multi-surface (CLI, desktop, cloud) with async parallel execution
Limitations
- −"Fully agentic" branding oversells reality; output needs human review and merge
- −Headline SWE-bench scores are company-reported and never appeared on the official leaderboard
- −Company focus has visibly shifted toward a sovereign-AI initiative, creating ambiguity about the standalone coding product, with thin public docs
Overview
Cosine builds an agentic AI software engineer for teams that need reviewable, controlled code. Its agent runs a research, plan, implement, verify, and handoff loop, powered by a proprietary model (originally Genie, since rebranded).
What it does
The agent maps a repo, scopes work, makes targeted changes, runs tests, and hands off a diff with evidence for human review and merge. It runs across CLI, a desktop workbench, and a cloud mode for async parallel work across tickets.
Integrations & setup
Historically integrated with GitHub, Jira, Linear, Slack, and VS Code. A REST API likely exists but was not clearly documented at this review, and MCP support was not confirmed.
Pricing
Subscription with usage credits: a Starter tier around $19/mo, a Team tier, and Enterprise.
Best for / not for
Best for professional teams that want a controlled, review-first coding agent. Buyers should note the company's shifting focus and thin public documentation.
Alternatives
Cognition's Devin and Factory are the closest delegated-agent competitors; Sweep and Cursor are adjacent.
What people are saying
We aggregate real LinkedIn discussion into sentiment for the agents people search most. Cosine isn't tracked yet, want it added? Request tracking.
FAQ
Is Cosine fully autonomous?+
Despite "fully agentic" marketing, the product is built around human review: it ends in a handoff stage delivering a diff and evidence for a human to approve and merge, so it operates as a supervised agent.
What happened to Genie?+
Genie was Cosine's original model brand. The model family was rebranded (to Lumen) and the company expanded toward a UK sovereign-AI initiative; the coding product persists, but the Genie name is best treated as legacy.
Sources
- Cosine product · accessed 2026-06-18
- Cosine pricing · accessed 2026-06-18
- Cosine (Y Combinator profile) · accessed 2026-06-18
- Cosine raises $2.5M for AI coding assistant Genie (SiliconANGLE) · accessed 2026-06-18
Last reviewed 2026-06-18