Ineffable Intelligence, an AI startup founded in late 2025 by David Silver, a former lead of DeepMind's reinforcement learning team and UCL professor, has secured a record-breaking $1.1 billion seed funding round. This is the largest seed round ever in Europe, according to the company, and values Ineffable Intelligence at $5.1 billion [1]. The funding round was co-led by U.S. venture capital firms Sequoia and Lightspeed, with participation from major industry players including Nvidia, DST Global, Index, Google, and the UK's Sovereign AI Fund, among others [1].
Ineffable Intelligence is focused on developing superintelligence through reinforcement learning, a method where AI models learn from their own experience rather than from human-provided data, distinguishing it from many current leading AI models that rely on internet text for training [1]. David Silver stated that the company's mission is to "make first contact with superintelligence" and aims to create a "superlearner that discovers all knowledge from its own experience, from elementary motor skills through to profound intellectual breakthroughs" [1].
The announcement comes amid a broader trend of top AI researchers leaving established tech giants to launch their own ventures, with investors pouring billions into these new labs. Recent examples include Recursive Superintelligence, reportedly raising up to $1 billion, and AMI Labs, which announced a $1 billion raise in March after its founder left Meta [1]. Other startups founded by former staff from OpenAI, DeepMind, Anthropic, and xAI have also raised significant funding in the past year [1].
UK Science and Technology Secretary Liz Kendall commented that the investment in Ineffable Intelligence supports a company "at the very frontier of AI, with the potential to transform entire sectors," emphasizing the UK's ambition to be a leader in AI innovation rather than just a consumer [1].
CONCLUSION
Ineffable Intelligence's record-setting $1.1 billion seed round highlights surging investor confidence in next-generation AI startups, particularly those led by prominent former Big Tech researchers. The company's focus on reinforcement learning and superintelligence, backed by major industry players, positions it as a key contender in the rapidly evolving AI landscape.