Originally published on AI Tech Connect.
What Cosine actually announced On 8 June 2026, at London Tech Week, British startup Cosine unveiled Lumen Sovereign — what it calls Britain's first fully sovereign frontier AI model, trained from scratch on domestic infrastructure and designed to run entirely inside a customer's own environment with no external data transfer. Cosine is a three-year-old, Y Combinator-backed team founded in 2022 by Alistair Pullen, Yang Li and Sam Stenner, previously best known for Genie, its autonomous coding agent. The company was named a flagship partner in the UK Government's £500 million Sovereign AI programme in April 2026, and says it has since secured memoranda of understanding (MoUs) from 13 large UK institutions to help shape the model's use cases, governance and security requirements before…
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