Eliminating Slop
Trained to avoid duplication, dead code, and unnecessary complexity. Optimized for minimal diffs that match your codebase's style and stay maintainable.
Lumen
Introducing Lumen
Lumen is Cosine’s family of production-first coding models, built for real engineering work: maintainable software, long-lived systems, and the complex codebases most models struggle to handle.
Beyond Mainstream Languages
Post-trained for enterprise and niche languages including C, R, Matlab, Fortran, Verilog, and Rust. Our 8-step data pipeline turns real production code into verifiable training trajectories.
Perfecting Vibe
Behavioral RL on scope discipline, honesty, evidence, and plan calibration. Less filler, more clarity, the judgment of a competent colleague.
Trusted by Engineers at
Real benchmarks. Real results.
Lumen is optimized for the outcomes that matter: shipping better code, faster, with fewer headaches.
42.4%
GPT-5.4
44.9%
Gemini 3.1 Pro
47.4%
GPT-5.5
48.3%
Kimi K2.6
53.9%
Lumen Outpost
Work where you already are
The same autonomous engineer across desktop, cloud, and terminal.
cosine — session
Type, paste or import your task…
Desktop
Start in the Cosine app
A richer workspace for active engineering: multi-window workflows, visible agent state, reviewable changes, and a clean bridge into cloud execution.
/desktopcosine.sh/platform
Auth Refactor
OPEN
Cloud
Collaborate in the cloud
Run work in parallel, keep long-running tasks moving, and give engineers, PMs, and stakeholders one shared place to plan, review, and ship.
/cloudtmux — ~/w/cosine
What was removed:
Ready · 3 files +34 −339204.6k↑ · 32.9k↓
Terminal
Keep going in the terminal
Stay in a terminal-native workflow with local-to-remote execution, MCP tool access, project context, and multi-agent orchestration from the command line.
/cli
Enterprise deployment
Built to fit your security environment.
Start quickly in Cosine Cloud, or move into a dedicated tenant or fully air-gapped deployment
when your infrastructure, data, and compliance requirements demand it.
Public cloud
Managed single-tenant
Air-gapped
*
Onboard today
Public cloud
Fully managed Cosine for teams whose requirements fit our standard cloud controls.
The fastest way to adopt Cosine with a fully managed product experience and no infrastructure to maintain.
Instant access to the latest Cosine models, product updates, collaboration features, and cloud execution.
Ideal for rapid evaluation, team rollout, and customers whose requirements fit our standard cloud controls.
Managed single-tenant cloud
A private Cosine environment operated for your organisation with enterprise controls.
Dedicated Cosine environment for your organisation, designed for enterprise isolation and predictable controls.
Connect to your network, identity, repositories, and policy requirements while Cosine manages the platform.
Best for teams that need private data boundaries without operating every part of the stack themselves.
Fully air-gapped
For organisations that need Cosine to run entirely inside their own security perimeter.
Run Cosine entirely inside your own infrastructure with no external dependencies and no data egress.
Deploy against strict isolation, regulatory, and classified-network requirements without compromising workflow quality.
Option to post-train or fine-tune models for internal codebases, frameworks, and legacy languages.
Recent highlights
View newsroom →
April 17, 2026 · Tech.eu
Cosine goes from benchmark leader to cornerstone of UK sovereign AI strategy
April 17, 2026 · Wired
The UK Launches Its $675 Million Sovereign AI Fund
April 17, 2026 · NextTechToday
Britain Bets on Cosine to Lead Sovereign AI Push
April 16, 2026 · UK Government
UK Government backs AI firms pioneering drug discovery and more
Start building
Ready to build? Get started with Cosine.
On your Desktop, in your CLI, with seamless handoff to the Cloud.
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