Sovereign AI you control
We train AI models 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.
Training the UK’s first frontier LLM, Lumen Sovereign.
Cosine is building Lumen Sovereign, a new family of frontier AI models trained on Isambard-AI, the UK's largest supercomputer, with backing from the UK Government.
Designed for highly regulated industries, Lumen Sovereign will specialise in UK and EU regulatory frameworks, legacy programming languages, and mission-critical workflows.
Available in 1T and 200B parameter variants from Q1 2027, Lumen Sovereign will support fully air-gapped deployment, giving organisations full control over their AI, data, and infrastructure.
Build your own frontier AI
Generalist AI models aren't built for every environment. With Cosine, organisations can develop specialised AI models tailored to their own data, workflows, and operational requirements.
All while keeping sensitive data and intellectual property within your control.
Customise Lumen Sovereign
Adapt Cosine's sovereign foundation models to your organisation's specialist knowledge, industry, and workflows.
Post-train your chosen model
Take an existing open-weight model and optimise it for your specific tasks, data, and performance requirements.
Build a model from scratch
Work with Cosine to develop an entirely new foundation model for challenges that demand purpose-built intelligence.
Try Cosine today
Cosine CLI
Delegate complex engineering tasks to AI agents that can understand entire codebases, write and refactor software, run tests and work autonomously across your development environment.
Cosine Desktop
Bring autonomous AI into your everyday workflows. Research complex topics, analyse documents and spreadsheets, and coordinate tasks across local files and tools, all from a single desktop workspace.
Cosine Cloud
Delegate long-running work to secure, isolated environments. Run tasks in parallel and review results as a team, with built-in controls for usage, model access, and spend.
Built for your security perimeter
Deploy frontier AI on your terms. From fully managed cloud to completely air-gapped infrastructure, Cosine gives you control over where your models run, how your data is handled and who can access your AI.
Fully air-gapped
Run Cosine entirely within your own infrastructure, with no external connectivity required. Maximum security, sovereignty and control.
Managed single-tenant
A dedicated, privately managed AI environment with enterprise-grade security, governance and isolation.
Public Cloud
Access Cosine's models and agents through our fully managed cloud, with no infrastructure to manage.
Frontier intelligence for critical industries
Cosine brings frontier AI into the environments where capability, security, and control matter most.
Deploy advanced reasoning and agentic capabilities within secure, sovereign infrastructure, from operational networks to disconnected and air-gapped environments.
- Turn complex information into actionable intelligence
- Modernise mission-critical software
- Identify and remediate vulnerabilities
