# The UK's Sovereign AI Lab > Source: > Published: 2026-10-03 15:45:39+00:00 # The Sovereign AI Lab We train AI models and specialised coding agents for organisations that need frontier capability inside secure environments. In coalition with ## Open Letter on Sovereign AI for the United Kingdom We have published an open letter, supported by a coalition of executives from critical national infrastructure. [View Open Letter](https://cosine.sh/sovereign-ai-open-letter) ## 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 [Read more about Niche-Bench](https://cosine.sh/blog/training-for-niche-languages-legacy-systems) # 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 optimisation, every evaluation metric is grounded in a single objective: better code. ### Less AI Slop Optimised for maintainability, readability, and production-quality outputs, not bloated code generation. ### Built for Real Systems Designed to reason across complex architectures, legacy infrastructure, and long-lived codebases. ### Beyond Mainstream Languages Post-trained for enterprise and niche languages including COBOL, Fortran, Verilog, Rust, and complex SQL. ## Use Cosine wherever you work ### Start in your terminal Work within a terminal-native interface, with a local-to-remote execution model, external tool access via MCP, and multi-agent orchestration. ### Collaborate in the Cloud Run multiple coding tasks in parallel, plan large changes and collaborate across engineers, PMs, and stakeholders in a shared project. ## 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 organisation 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.