Ineffable Intelligence, a UK-based AI startup led by former Google DeepMind researcher David Silver, has assembled a team of cofounders and hires drawn from DeepMind, InstaDeep, and venture firm Flying Fish. The company aims to build AI superintelligence using reinforcement learning, the training technique with which Silver is closely associated.

Why now? Ineffable was incorporated in November 2025, and Silver became a director in January 2026 after leaving DeepMind. It joins a wave of “neolabs” — frontier AI startups founded largely by veterans of DeepMind, OpenAI, and Anthropic over the past two years.

What’s the endgame? Like its peers, Ineffable’s stated mission is to create AI superintelligence. In reinforcement learning, a model learns by trial and error to maximise a reward set by its trainer — actions that earn rewards get reinforced, while others fade, a process loosely akin to operant conditioning in psychology.