AlphaGo creator raises $1.1 billion for London AI startup

Tuesday 28 April 2026 - 11:20

By: Dakir Madiha

AlphaGo creator raises $1.1 billion for London AI startup

David Silver, the British artificial intelligence researcher behind AlphaGo, has secured $1.1 billion in seed funding for his London based startup Ineffable Intelligence. The deal values the five month old company at $5.1 billion, marking the largest seed round ever recorded in Europe and underscoring strong investor demand for advanced AI ventures led by top researchers.

The funding round was co led by Sequoia Capital and Lightspeed Venture Partners, with participation from major technology and investment firms including Nvidia, Google, and Index Ventures. The scale of the investment reflects confidence in Silver’s track record and in the potential of alternative approaches to artificial intelligence beyond current dominant models.

Silver left DeepMind at the end of 2025 after more than a decade, during which he played a central role in developing systems such as AlphaGo, AlphaZero, and MuZero. These programs demonstrated the power of reinforcement learning by achieving superhuman performance in complex environments including board games and video games. Ineffable Intelligence was incorporated in November 2025, with Silver formally appointed as director in January.

The company’s vision is based on a shift away from reliance on human generated data. Silver argues that systems trained on static datasets are approaching performance limits. Instead, he proposes AI models that learn continuously through interaction, using trial and error to generate knowledge independently. This concept, described as the “experience era,” builds on ideas developed with reinforcement learning pioneer Richard Sutton and aims to create systems capable of autonomous discovery.

This approach places the startup in contrast with leading AI developers focused on large language models. Companies such as OpenAI and Anthropic have scaled models trained on vast corpora of human text, while Silver’s strategy emphasizes self learning agents. Previous reinforcement learning systems have already shown the ability to produce novel strategies, including unconventional moves in chess developed without human input.

Investor interest in this alternative paradigm has intensified. Early reports indicated a target of $1 billion at a $4 billion valuation, but the final round exceeded both figures, signaling strong competition among backers. The funding surpasses earlier European seed records, including the 2023 round for Mistral AI, which was considered exceptional at the time.

Despite the financial backing, Ineffable Intelligence has not yet released a product or published research under its own name. The concept of a large scale system trained solely through reinforcement learning without pretraining remains unproven at the level envisioned. Initial performance benchmarks are expected by the end of 2026, which will provide the first indication of whether the approach can scale effectively.

The United Kingdom government has also moved to support domestic AI development through a sovereign AI fund aimed at retaining talent and economic value. It remains unclear whether Ineffable Intelligence will receive support from this initiative. Silver, who also holds an academic position at University College London, now faces the task of translating theoretical work into a functional system that could redefine how advanced AI models are built.