The Coding Model That Actually Gets It
Deploy models where your data lives, with security, visibility, and ownership built in.
Real benchmarks. Real results.
Lumen is optimised for the outcomes that matter: shipping better code, faster, with fewer headaches.
GPT-5.4
Gemini 3.1 Pro
GPT-5.5
Kimi K2.6
Lumen Outpost
Our thesis: specialists outperform generalists
Most AI models try to be everything to everyone. They write poetry, solve physics problems, and summarise novels.
Lumen does one thing: write exceptional software.
Our thesis is simple. A model trained exclusively on real production code, from real engineering teams will always beat a generalist at the task developers actually need.
That's why every training decision, every optimization, every evaluation metric is grounded in a single objective: better code.
One product, three surfaces
Start in the Cosine app
Cosine Desktop gives you a richer interface for active work, a cleaner path into remote and cloud execution, and a single place to manage multi-agent workflows.
Collaborate in the Cloud
Run multiple coding tasks in parallel, plan large changes in Research Mode and collaborating across engineers, PMs, and stakeholders in a shared project/task model.
Keep going in the terminal
Work within a terminal-native interface, with a local-to-remote execution model, external tool access via MCP, and multi-agent orchestration.
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
Fully managed Cosine for teams whose requirements fit our standard cloud controls.
Managed single-tenant cloud
A private Cosine environment operated for your organization with enterprise controls.
Fully air-gapped
For organisations that need Cosine to run entirely inside their own security perimeter.
Three models. One philosophy.
Lumen isn't a single model — it's a system designed for every layer of the development workflow.
Runs cheaply, operates on-device, and handles the heavy lifting around the coding loop.
Proven in the open
Our work has been independently validated across leading industry platforms and events.