Most of the artificial intelligence now used in business has been trained to reproduce patterns found in vast stores of human-generated text, images and data. Ineffable Intelligence, a British company founded by the AI scientist David Silver, is taking a different path. Its systems are designed to learn through experience, testing ideas against their environment and improving over time until they arrive at solutions nobody has supplied.

The UK government is supporting the venture through Sovereign AI, its dedicated AI investment unit, co-investing with the British Business Bank to help the company build its technology, expand its team and scale its operations from Britain. The backing forms part of a $1.1bn seed round, described by the company as the largest in European history, which valued the business at $5.1bn.

The significance of the deal goes past its size. It signals a clear intention for Britain to build frontier AI companies of its own, keeping world-class talent, intellectual property and future growth within the UK economy.

A different route to intelligence

Large language models and similar systems learn chiefly by absorbing existing human knowledge, which ties their output closely to what people already know. Ineffable is developing a new generation of algorithms that learn in a way closer to human learning, by acting, observing the results and refining their approach. The company’s systems interact with their surroundings, test ideas and improve with each attempt.

The method draws on reinforcement learning, the field in which Silver has built his career. Josephine Kant, Head of Ventures at the Sovereign AI Unit, describes the goal as a superlearner, a system that discovers new knowledge from its own experience. The government expects the approach to open the door to breakthroughs in science, medicine and engineering.

A proven pioneer

Silver is widely regarded as one of the most influential figures in modern artificial intelligence. He is a Professor at University College London and previously served as Head of Reinforcement Learning at Google DeepMind, where his work helped power AlphaGo, the system that famously beat the world champion at Go. He founded Ineffable in 2025 to take the next step and build AI capable of generating genuinely new knowledge.

His reputation has shaped the response from government and investors alike. AI Minister Kanishka Narayan said: “David Silver is one of the world’s foremost AI leaders, now taking one of the world’s most innovative approaches to frontier AI. I am delighted that he is doing so right here in the UK, backed by the full support of the British state.” Silver has also reportedly pledged to donate his personal proceeds from the company to high-impact charities.

“From AlphaGo to AlphaZero to AlphaProof, he has spent nearly 2 decades turning reinforcement learning from a research idea into the results the rest of the field builds on.”

Josephine Kant, Head of Ventures, Sovereign AI Unit

Record backing from private capital

Private investors have matched the government’s confidence with substantial capital. Sequoia Capital and Lightspeed Venture Partners led the $1.1bn seed round, with participation from Nvidia and Google among others. The deal valued the London-based company at $5.1bn before it had released a product.

The final terms comfortably exceeded the targets reported in February 2026, when Silver was understood to be raising $1bn at a pre-money valuation of around $4bn. The scale of the round places Ineffable among a small group of research-led laboratories founded by leading scientists. It also gives the company the resources to compete globally for specialist talent and computing power.

State capital at venture speed

Sovereign AI is the UK’s £500 million initiative to back homegrown AI founders, drive growth and create jobs. Launched on 16 April 2026, it operates like a venture capital fund with the strength of the state behind it, investing directly in early-stage and growth-stage companies and cutting through the red tape that can hold good ideas back. Typical equity investments range from £1 million to £10 million, although the Unit does not disclose individual figures on grounds of commercial sensitivity.

Ineffable became the Unit’s second direct investment within weeks of launch, bringing the total number of companies it supports to eight. Science and Technology Secretary Liz Kendall described Sovereign AI as “our bet on Britain” and said the investment “will support a company at the very frontier of AI, with the potential to transform entire sectors”. Charlotte Lawrence, Managing Director of Direct Equity at the British Business Bank, called Silver “a generational talent who has consistently been on the cutting edge of AI development”.

Britain’s growing AI portfolio

Ineffable joins a growing portfolio of British AI companies supported by the state. The fund’s first equity investment went to a company building a new class of AI infrastructure, while six further startups are receiving access to the AI Research Resource supercomputer network. Sovereign AI holds a right of first refusal on future investment in a number of these businesses.

Computing access is one of the most significant hurdles facing young AI companies, since training advanced models, testing ideas and running complex simulations all depend on specialist hardware such as GPUs. The government regards homegrown AI capability as essential to the UK’s national security and economic power. Kant has said the Unit’s role is to ensure founders with this level of ambition never have to choose between it and their home.

What discovery-led AI could unlock

The commercial case for AI that generates its own knowledge stretches across several sectors. Medicine, engineering and scientific research all advance through answers that do not yet exist, and a system able to test and refine ideas independently could accelerate progress in each. Lawrence has said the company has the potential to bring fundamental change to the UK’s scientific and technology landscape.

The combination now in place is unusual by any measure. Leading private investors, a dedicated state fund and one of the field’s most accomplished researchers are aligned behind a single British venture. Ineffable is well placed to test how far discovery-led AI can go, and to do so from the UK.

Opportunity for UK business

The deal carries practical significance for British companies well outside the AI sector. Sovereign AI was established to back homegrown founders, drive growth and create jobs across the UK, and its model of fast, direct equity investment gives domestic companies a route to scale without relocating. The government’s stated aim is for the UK to become a maker of AI, keeping the value it generates within the domestic economy.

Wider access to computing power adds a further advantage for young British companies. Six startups are receiving time on the AI Research Resource supercomputer network, which eases one of the most costly barriers to building advanced models. For established firms in medicine, engineering and scientific research, a British-built system capable of producing new knowledge opens the prospect of working with frontier technology developed at home.