# Ineffable Intelligence

AI Research · London · Seed

Ineffable Intelligence is a London AI lab founded in 2025 by David Silver, the former Google DeepMind researcher behind AlphaGo, AlphaZero, AlphaFold and AlphaProof, and a professor at UCL. The company is pursuing superintelligence through reinforcement learning, building a 'superlearner' that learns from its own experience rather than from human-generated internet text used by conventional large language models. It broke out of stealth with a $1.1B seed round at a $5.1B valuation, the largest seed in European history, led by Sequoia and Lightspeed with Nvidia, Google, DST Global, EQT and others; the UK's Sovereign AI Fund and British Business Bank also participated. Silver has pledged to donate his personal proceeds to charity via Founders Pledge.

- Website: https://ineffable.ai
- Careers: https://jobs.ashbyhq.com/ineffable
- Sector: [Frontier AI & Research Labs](https://aistartupslist.co.uk/sector/frontier-ai.md)

## Facts

- Funding stage: Seed
- Total raised: $1.1B
- Founded: 2025
- Headquarters: London, UK
- Team size: 1-10

## Notable investors

Sequoia Capital, Lightspeed Venture Partners, Nvidia, Google, DST Global, Index Ventures

## Open UK & remote roles

- [Member of Technical Staff (Research / Engineering)](https://aistartupslist.co.uk/company/ineffable-intelligence/member-of-technical-staff-research-engineering-1qoajs.md) · London (posted 2026-04-21)
- [Platform Engineer](https://aistartupslist.co.uk/company/ineffable-intelligence/platform-engineer-eabaha.md) · London (posted 2026-08-12)