The Gradium Nvidia seed round has closed at $100 million after the Paris-based voice AI startup reopened its financing to new investors, with Nvidia among those joining the cap table. The fresh capital will fund a new Bay Area office as the company pushes into the territory where its fiercest competitors are headquartered.
Voice AI at Scale, Without the Pause
Gradium’s core proposition is audio models that generate voice with ultra-low latency, eliminating the hesitation that has long made AI agent conversations feel stilted. The company describes its ambition as becoming ‘the technical backbone of global voice technology by eliminating the long-standing trade-offs between naturalness, speed, and cost.’
The founding team was assembled with that precision in mind. Gradium’s four co-founders are Neil Zeghidour, who previously worked at Meta and Google Brain; Olivier Teboul, also from Google Brain; Laurent Mazaré, from Google DeepMind and Jane Street; and Alexandre Défossez, from Meta. Between them, the team has a hand in the neural audio codecs and audio language models that now underpin much of the field.
The company was spun out of Kyutai, a non-profit French AI lab launched in 2023 with €300 million in backing from Xavier Niel, Rodolphe Saadé, and Eric Schmidt and focused on open-source voice AI research. Kyutai retains a shareholding stake in Gradium, and Zeghidour has said both organisations will remain close, with Gradium drawing on the lab’s ongoing research while generating commercial value for it.
Gradium was founded in September 2025 and emerged from stealth in December of that year with $70 million already raised from FirstMark Capital, Eurazeo, DST Global Partners, Rodolphe Saadé, Eric Schmidt, and Xavier Niel. The company said at the time it was already generating revenue within weeks of founding, with early customers spanning gaming, AI agents, customer care, language learning, and healthcare.
What the Gradium Nvidia Seed Round Buys
Nvidia’s entry into the round matters beyond the dollar figure. For a startup selling voice infrastructure to developers building production-grade AI systems, having the dominant chip supplier as a backer sends a signal to engineering teams evaluating platforms. Sifted noted the depth of the original investor roster; adding Nvidia extends it into the hardware layer of the AI stack.
The Bay Area office is the other tangible use of proceeds. Paris has cultivated a genuine AI cluster, and Gradium’s spin-out from Kyutai reflects the strength of that ecosystem. Even so, the proximity to Anthropic, Google, Meta, and OpenAI offers something Paris cannot fully replicate: the informal deal flow, talent networks, and partnership conversations that tend to happen in person.
The startup is targeting developer and engineering teams building real-time, production-grade voice systems for AI agents, customer support tools, and voice-enabled games. Competition in that space is intense. ElevenLabs, one of the most prominent voice AI rivals, was valued at $11 billion in February, and Google’s Gemini sits at the top of the stack as both a model provider and a potential competitor.
Gradium’s most concrete early win is a partnership with Renault. The engagement powers RMC BFM Drive, described as the first fully AI-generated, personalised radio experience built into Renault connected vehicles, available since March 2026. Gradium’s text-to-speech models synthesise transitions between audio segments in real time using voice clones of RMC BFM journalists, giving the system the feel of a live broadcast rather than a prompted chatbot.
That use case points at a market far broader than AI agents on hold queues. Automotive infotainment, live radio, gaming, and healthcare voice interfaces all require the same thing Gradium is selling: voice that responds fast enough that the listener does not notice the machine behind it.
The Gradium Nvidia seed round, coming seven months after the company’s launch, now sets the clock on the next question: whether the Bay Area push produces a marquee US customer before the company needs to raise again.
