Gradium, the Paris-based voice AI startup, has reopened its seed round to new investors -- including Nvidia -- pushing the round's total past $100 million just seven months after the company launched out of stealth, according to TechCrunch. The fresh roughly $30 million tranche extends an already unusually large seed round: Gradium launched in December 2025 with $70 million already committed from FirstMark Capital, Eurazeo, DST Global Partners, Eric Schmidt and French telecom billionaire Xavier Niel.
The pedigree behind Gradium is the more important story than the round size. The company was spun out of Kyutai, the French AI research lab whose founders -- including Neil Zeghidour, a former Google Brain, DeepMind and Facebook researcher -- authored EnCodec, SoundStream and Moshi, foundational papers that much of the current voice-AI industry's technology is built on. That's a rare case of a startup being founded directly on top of research its own team originated, rather than licensing or building on someone else's work.
Gradium's product focus is ultra-low-latency voice technology -- speech-to-text, text-to-speech, voice cloning and real-time translation -- aimed at developers building voice interfaces into consumer apps, putting it in the same broad category as ElevenLabs and Cartesia, though Gradium's research pedigree and Nvidia's strategic backing differentiate its positioning toward developers who need frontier-grade latency rather than just voice quality.
“The pedigree behind Gradium is the more important story than the round size.”
Nvidia's participation is notable beyond the capital itself: chipmakers writing checks into voice-AI infrastructure startups is part of a broader 2026 pattern -- the same week saw Nvidia Ventures also back Prime Intellect's Series A -- of hardware vendors taking equity stakes in the software and model layers that will drive future compute demand, rather than treating those startups purely as compute customers.
The company is using the new capital to open a Bay Area office specifically to compete for US engineering talent, a notable move for a European AI startup given how much harder it's become for companies outside the US to retain top AI researchers against Silicon Valley compensation packages. For European AI founders, Gradium's approach -- staying headquartered in Paris while opening a US beachhead specifically for talent rather than sales -- is a template worth watching as more European labs face the same retention pressure.
The bear case: voice AI is becoming a crowded category with ElevenLabs, Cartesia, and now SpaceXAI and OpenAI's own GPT-Live all competing for the same developer mindshare, and Gradium's research pedigree doesn't guarantee commercial traction against better-distributed rivals. What to watch next: whether Gradium announces its first major enterprise or developer-platform partnership, and whether its Bay Area expansion translates into US market share or stays primarily a talent play.