Alistair Pullen
Co-founder and CEO of Cosine, the UK sovereign AI company.
Last refreshed: 19 April 2026 · Appears in 1 active topic
What does Alistair Pullen say about classified AI and why it must stay inside your walls?
Timeline for Alistair Pullen
Mentioned in: UK names first Sovereign AI investees
European Tech Sovereignty- Who is Alistair Pullen?
- CEO and co-founder of Cosine, the British sovereign AI company. A Cambridge PhD who founded Cosine in 2022 with Yang Li.Source: Tech.eu 17 April 2026
- What did Alistair Pullen say about classified AI?
- Pullen said 'The moment your work touches classified infrastructure, you need an AI that lives entirely inside your walls' — explaining why Cosine is air-gapped and on-premise.Source: Tech.eu 17 April 2026
- How does Cosine compare to OpenAI for defence use?
- Cosine is air-gapped with no internet or foreign model dependencies, designed specifically for classified nuclear, defence, and financial infrastructure — a category where Cloud-based OpenAI cannot compete.Source: Tech.eu 17 April 2026
Background
Alistair Pullen co-founded Cosine in 2022 alongside Yang Li, both Cambridge PhDs, and serves as its Chief Executive Officer. When Cosine was announced as the cornerstone investee of the UK Sovereign AI Fund on 16 April 2026, Pullen articulated the product logic: 'The moment your work touches classified infrastructure, you need an AI that lives entirely inside your walls' . The Sovereign AI Fund secured an option to participate in Cosine's next funding round.
As CEO, Pullen oversees an air-gapped, on-premise sovereign AI coding system that supports 38 programming languages including Fortran and COBOL. Cosine has outperformed OpenAI, Anthropic, Mistral, and DeepSeek on independent coding benchmarks two consecutive years under his leadership.
Pullen's CEO narrative is grounded in deployment reality rather than benchmark performance: Cosine's market is organisations where the risk model prevents using Cloud AI entirely. That positions him as building a category — sovereign AI for classified infrastructure — rather than competing directly with general-purpose AI products .
