The Sovereign Frontier Model
Lumen Sovereign is Cosine’s planned sovereign model. It is being developed for organisations that need frontier-capable AI while keeping control over where models run, how data is governed, and how systems are deployed.
Leading the UK sovereign AI story
Co-designed with major UK institutions
Coalition members will help define the use cases, security requirements, and governance standards Lumen Sovereign must meet.
Training on UK sovereign compute
Lumen Sovereign is being developed using compute awarded through the UK Government’s Sovereign AI programme, with training on Isambard-AI.
Frontier capability for sovereign AI
Lumen Sovereign is being developed for complex work in regulated environments, combining frontier-level ambition with UK-controlled training, governance, and deployment.
Built for the environments where AI cannot leave the perimeter
Lumen Sovereign is being designed for the world’s most secure industries, where sensitive code, data, and operational context must stay inside controlled infrastructure.
Runs inside controlled customer environments
Supports private and dedicated deployment models
Compatible with fully air-gapped systems
Keeps sensitive code and data inside approved infrastructure
Designed for governance, auditability, and security review
Gives regulated teams a path to frontier-capable AI without relying on foreign-hosted models
The final model in the Lumen family
Scout
Utility model for codebase mapping, retrieval, indexing, and high-volume support workflows. Use when you need low-cost intelligence at scale.
Outpost
Production coding model for enterprise AI-assisted software engineering across teams. Use when you need strong coding performance, maintainability, and practical cost efficiency.
Sovereign
Frontier sovereign model for architecture, deep reasoning, complex transformation, and controlled deployment environments. Use when performance and control matter above all else.