Cosine

Paid

Cosine is a coding assistant for teams that cannot ship their code to US clouds. It runs in air-gapped rooms, single-tenant setups, or public cloud. You get autonomous agents that take a task from Jira, Slack, or the UI and return a pull request. It speaks COBOL, Fortran, Verilog, ABAP, and complex SQL—not just Python and JavaScript.

The tool grew from Buildt, then became Genie, and is now the Lumen model family. Three models cover different jobs: Scout for fast local work, Outpost as the daily workhorse, and Sovereign (still in training) for UK government-backed deployment. Pricing is flat per team, not per seat.

It is a Coding Assistants tool. You pick it when data residency rules block the usual suspects.

Open it if you need autonomous coding under strict data rules. Skip it if you want real-time help inside your IDE.

These are the jobs where Cosine changes what you can do.

• Teams with a backlog of discrete engineering tickets: You assign tasks async. Hours later you get a tested PR. Your day frees up for harder work.
• Developers wanting to offload routine maintenance tasks: Small refactors and bug fixes run without your hand on the keyboard. You review instead of write.
• Projects requiring multi-file changes across codebase: The agent traces dependencies you would miss. You catch what matters in review.
• Engineers ready to shift from coder to task orchestrator: You write the prompt, check the plan, and merge. Your job becomes quality gate, not line writer.
• Teams needing shared code context across platforms: One agent spans CLI, VS Code, desktop, and cloud. You stop losing context when you switch tools.
• Users frustrated by context loss in other agents: The agent keeps state across long tasks. You do not rebuild mental models mid-stream.
• Defence and national security organizations requiring air-gapped AI: Zero data egress. You run on your own metal without vendor lock-in.
• Teams maintaining COBOL, Fortran, ABAP or mainframe systems: Models tuned for legacy syntax. You modernize without hiring rare specialists.
• Organizations with data residency rules blocking US cloud processing: UK-built, UK-hosted options. You stay inside your legal boundary.
• Teams wanting flat pricing rather than per-seat licenses: $199 per month covers the team. You predict costs as you grow headcount.

These are what you notice after you use it.

• Fully autonomous end-to-end task completion: You write a ticket. It returns a PR. You spend your time on review, not implementation.
• Verified benchmark leadership: 30.08% on SWE-Bench, 72% on SWE-Lancer. You get specific claims you can check against public leaderboards.
• Native workflow integrations: Slack, Jira, GitHub connect out of the box. You assign work where you already talk.
• Task-based pricing: You buy credits, not seats. Heavy users get rewarded; casual users do not subsidize them.
• Model-agnostic credit system: You can plug in third-party models with multipliers. You pick the tool for the job without switching platforms.
• Parallel agent execution: Multiple agents work in isolated sandboxes. You run several tickets at once without collision.

The flow is assignment, not pair programming.

1. Connect your repo and pick your deployment: air-gapped, single-tenant, or cloud.
2. Assign a task via Slack, Jira, or the Cosine UI with a plain description.
3. The agent analyzes your codebase, plans the change, writes code, and runs tests.
4. Review the pull request it opens. Merge or send it back with notes.

The fit is narrow. Skip it when these apply.

• Not for real-time, small-scale IDE edits: You wait hours for results. It is the wrong tool for quick line-by-line help.
• Credit-based billing is hard to forecast: Frontier models burn 20x credits. Your first bill may surprise you.
• Thin independent review base: Six Product Hunt reviews, zero G2. You buy on promise more than social proof.
• Documentation lags the product: You will find dead links to Buildt and Genie. Expect to hunt for current facts.
• Lumen Sovereign not yet shipped: Promised late 2026. You cannot plan around it today.