- Funding
- $1.1B seed
- Valuation
- $5.1B
Ineffable Intelligence is a London-based AI lab founded by David Silver, former head of reinforcement learning at Google DeepMind. It emerged from stealth in April 2026 with a $1.1 billion seed at a $5.1 billion valuation — the largest seed round in European history — co-led by Sequoia and Lightspeed with Nvidia, Google and the UK Sovereign AI Fund participating. Its thesis: RL self-play, learning without human-labelled data, unlocks qualitatively different AI capability.