A London-based AI lab called Ineffable Intelligence has emerged with a seed round so large it is already being described as Europe’s biggest at this stage. According to TamRadar, the startup has raised $1.1bn in a financing led by Sequoia Capital and Lightspeed Venture Partners, with backing also said to include DST Global, Index Ventures and Nvidia. The company plans to use the money to recruit engineers and researchers while expanding the compute power behind its research, which is centred on reinforcement learning systems that can improve without relying on human-generated training data.

The round values the business at $5.1bn and underscores how aggressively capital is still flowing into frontier AI, even as investors become more selective elsewhere. TamRadar said the funding marks a rare mega-seed in Europe and highlights the growing appetite for companies promising new approaches to model training and autonomy. If the claims hold, it also places Ineffable among the region’s most closely watched AI startups before it has even reached the scale usually associated with later-stage fundraising.

Elsewhere in the market, Nebius said it has agreed to buy Eigen AI for about $643mn in cash and stock, in a deal expected to close in the coming weeks subject to regulatory clearance. The AI cloud company said the acquisition will strengthen its Token Factory product by combining Eigen AI’s optimisation technology with Nebius’s global compute infrastructure. Reporting from SiliconANGLE and Nebius’s own announcement both point to the same strategic logic: the industry is moving beyond model training alone and is now racing to make inference faster, cheaper and easier to deploy at scale.

The transaction also fits a broader shift in Europe’s tech scene, where infrastructure, applied AI and deeptech remain the favoured targets for large cheques. In the same weekly roundup, Tech.eu highlighted other sizeable moves, including Ebury’s financing of more than £550mn, Sereact’s $110mn round and several notable fund closes from KOMPAS VC, EQT and Earlybird. Taken together, the deals suggest that while the funding market remains uneven, investors are still willing to write very large cheques for businesses they believe can sit at the core of the next generation of European technology.

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Source: Noah Wire Services