Cosine

The sovereign AI lab. Building frontier models and agents for critical infrastructure.

[Cosine @CosineAI]

Today, we published an Open Letter on sovereign AI for the United Kingdom, alongside a coalition of leaders across critical national infrastructure.

AI is a question of national capability. While Britain possesses world-class research and software talent, we risk becoming a customer in this technological shift rather than a serious builder. Countries with reliable access to compute and strategic models will have greater resilience. Those that lack these capabilities risk depending on infrastructure and decisions determined elsewhere.

Sovereign AI means the ability to govern, secure, evaluate, and sustain strategically important AI capabilities under UK jurisdiction. We must ensure high-consequence systems can be inspected and governed domestically to strengthen public confidence and national resilience, while remaining engaged internationally.

We are urging the Government to treat AI as strategic national infrastructure. We need a long-term plan that builds UK capability in critical domains, uses public procurement to create demand, and aligns investment with clear national priorities.

The coming year will shape Britain’s position for decades to come.

You can read the full letter attached and explore our recommendations in more detail on our open letter page here: https://t.co/MudWZzUfBJ

@andyburnham @KanishkaNarayan

[Cosine @CosineAI]

We’re pleased to welcome Whitespace to the Lumen Sovereign coalition.

Together, we’ll explore how UK-built AI could work within Collective, Whitespace’s sovereign AI operating system, with an initial focus on defence and keeping organisations in control.

[Cosine @CosineAI]

We’re excited to be partnering with Shift to advance sovereign AI for operational resilience.

By combining Cosine’s advanced reasoning with Shift’s platform, we’re helping financial institutions test disruptions and identify single points of failure.
https://t.co/fB0JT8ua78

[Cosine @CosineAI]

Cosine is heading to Defence Disrupted.

Join us 20 October in London to discuss national resilience and sovereign AI – driving UK growth, retaining economic benefits, and maintaining technological advantage.

Request your place: https://t.co/CxtqQuKnEq

[Yang Li @yangli_]

Last week at Apple’s London HQ, my co-founder @AlistairPullen was invited to present to some of the UK’s most security-conscious organisations on the work we’re doing at @CosineAI.

I can’t share who was in the room, or most of what we discussed, but it’s becoming clear the idea that serious AI must live in someone else’s data centre is starting to fall apart.

Apple Silicon is now powerful enough, secure enough and efficient enough to make local AI genuinely serious. And once that is true, there’s an obvious question to ask:

Why would defence, government, banks or critical infrastructure send their most sensitive intelligence outside their own perimeter if they no longer have to?

That is where Cosine fits in. Apple provides the hardware foundation. We provide the sovereign AI stack on top of it: models, agents, orchestration and applications that run fully on-premise, fully air-gapped, with no external dependency. Pull the cable, and it still works.

And yes, we were pretty pleased that Apple chose us to help explain that future to the room. More to share soon.

[Cosine @CosineAI]

@wincolladd @UKSovereignAI We're still building it. Once it's ready, we'll share the results. We're publishing regular progress updates in our newsletter: https://t.co/8V4sNPSPjN

[Cosine @CosineAI]

With support from @UKSovereignAI we’re training Lumen Sovereign on the Isambard-AI supercomputer, hosted by the Bristol Centre for Supercomputing (BriCS).

Powered entirely by UK-sourced renewable energy, Isambard-AI uses a closed-loop liquid cooling system that reuses water to reduce consumption, minimising the environmental impact of training.

This world-class infrastructure gives us the dedicated, secure compute needed to develop sovereign AI for the UK’s critical sectors.

[Cosine @CosineAI]

Sovereign AI for European defence: who controls it, and who is accountable?

A private breakfast roundtable with Simon Harwood (Leonardo UK) and Alistair Pullen (Cosine).

26 October – RAF Club, London.

Limited places. Register interest: https://t.co/R26CVASYnc

[Cosine @CosineAI]

We are pleased to welcome Baringa to the Lumen Sovereign coalition.

Baringa brings experience delivering transformation across some of the most complex, highly regulated industries.

By joining the coalition, Baringa adds sector-specific perspectives on energy networks, system transformation, and AI delivery to help guide the operational deployment of our upcoming model.

Our initial work will explore how sovereign AI can enhance Baringa’s public work running and hosting critical national infrastructure.

[Cosine @CosineAI]

What do UK critical sectors need from Sovereign AI?

We surveyed defence primes, banks, energy operators & research bodies on Lumen Sovereign.

→ Explicit provenance & transparency
→ Air-gapped deployment
→ Edge-ready models
→ SWE + domain reasoning

Full report: https://t.co/isyBcaj1yO

[Cosine @CosineAI]

We are pleased to welcome @edfenergy to the Lumen Sovereign coalition.

EDF brings essential insight from the highly regulated energy sector. Niels Roberts, Chief Information Officer at EDF (UK), shared the following:

“AI is already in use across the UK’s energy system. But for it to be widely used in highly regulated critical national infrastructure, we need to ensure that it is both reliable and resilient. Sovereignty will be crucial. EDF is therefore delighted to bring its unique perspective across nuclear, renewables and energy supply to the development of the UK’s own sovereign AI capability.”

Together, we are ensuring that Lumen Sovereign is shaped around the operational realities and assurance requirements of complex, high-stakes environments.

[Cosine @CosineAI]

Sovereign AI dominates global conversations, yet most discussions focus on policy rather than the engineering realities of building these systems.

Today, we’re publishing a practitioner’s guide to sovereign AI, written specifically for teams worldwide designing and implementing these architectures.

At its core is our AI Value Chain framework: a layer-by-layer technical breakdown of the dependencies at every stage:

→ Hardware
→ Infrastructure
→ Data
→ Models
→ Serving & Orchestration
→ Application

We also explore a UK case study, featuring our work engineering Lumen Sovereign, Britain’s first fully sovereign frontier model.

This was a significant collaborative effort. Thank you to our Cosine contributors (Niall Devlin, Robert Gibson) and our external collaborators (Harshali Ranjan, Kristoffer Bjärkefur, and Luis Eduardo San Martin) for sharing their expertise.

https://t.co/OA5N5WeLJF

[Cosine @CosineAI]

https://t.co/tIID5WRTrR

[Cosine @CosineAI]

https://t.co/tIID5WRlCj

[Cosine @CosineAI]

We’re pleased to welcome Sopra Steria to the Lumen Sovereign coalition.

They bring deep expertise in delivering critical national infrastructure. Craig Wilson, CEO of Sopra Steria UK, said:

“Sovereign AI is moving from policy debate to operational reality. For organisations delivering critical services, the opportunity is to bring people, technology and transformation together to improve productivity, while maintaining trust and control. This depends on how AI is built, deployed and governed. By joining Cosine’s coalition, we will bring our experience of delivering complex, regulated services at scale, to help turn sovereign AI into practical solutions that create value safely and securely.”

Together, we’re accelerating safe, sovereign AI adoption across highly regulated UK sectors.

[Cosine @CosineAI]

Register here: https://t.co/2D2pBBK8hZ

[Cosine @CosineAI]

Join Cosine and Telefónica Tech (EN) for an upcoming webinar on Lumen Sovereign & the strategic role of sovereign AI in the enterprise.

We'll discuss the strategic importance of sovereign AI for UK organisations and share learnings from Lumen Sovereign's ongoing development.

[Yang Li @yangli_]

If you’re as concerned about AI sovereignty as I am, I recently joined Ben Ansell on BBC Radio 4. We got into the realities of building sovereign technology in the UK and what we’re building at @CosineAI.

@benwansell
https://t.co/7TucWezHAu

[Cosine @CosineAI]

Independent assurance and safety are core to how we design and govern our model. We’re pleased to welcome Advai to the Lumen Sovereign coalition.

Advai shared the following:

“We are excited to be collaborating with Cosine on the Lumen Sovereign model build, bringing Advai’s extensive experience in testing, red teaming and monitoring AI models and systems to the coalition. If sovereign AI is going to be trusted in high-assurance and regulated environments, safety, security and accountability need to shape how those models are designed and built from the ground-up. Doing so creates a foundation for effective, reliable and trustworthy models that can be deployed at scale.”

Embedding independent testing throughout development strengthens the foundations Lumen Sovereign needs to operate safely where trust matters most.

[Cosine @CosineAI]

We’re excited to collaborate with Llywodraeth Cymru / Welsh Government. 🏴󠁧󠁢󠁷󠁬󠁳󠁿

We are bringing Welsh language data into the training pipeline for our Lumen Sovereign model, ensuring our sovereign AI reflects the diverse languages and culture of the UK. More details soon!

-

Rydym yn gyffrous i gydweithio â Llywodraeth Cymru. 🏴󠁧󠁢󠁷󠁬󠁳󠁿

Rydym yn cyflwyno data yn yr iaith Gymraeg i'r broses hyfforddi ar gyfer ein model Lumen Sovereign, gan sicrhau bod ein modelau AI sofran yn adlewyrchu ieithoedd a diwylliant amrywiol y DU. Edrychwn ymlaen at rannu mwy o fanylion yn fuan!

@WelshGovernment