COLD START / catalog / c/gradiumretrieved 2026-05-16T01:38 UTC · 24 sources read

Gradium

Gradium sells real-time voice APIs — TTS, STT, smart turn-taking, and instant voice cloning — built on audio language models, targeting developers and enterprises shipping production voice systems and AI agents.

gradium.ai · Paris

CALL NO.CS·GRADIUM·26

StageSeedDecember 2025 · led by FirstMark Capital[2][3][4][5][6]

Raised$70Mdisclosed rounds[2][3][4][6]

Headcount14as of Apr 2026[1]

Valuationnot publicly disclosedno source in ledger

Founded2025[3][5]

Money

Raised $70M across disclosed rounds.[2][3][4][6]

Seed closed December 2025, led by FirstMark Capital.[2][3][4][5][6]

post-money valuation is not publicly disclosed.

Named investors include FirstMark Capital, Eurazeo, DST Global Partners, Korelya Capital, Amplify Partners, Liquid 2 Ventures, Drysdale Ventures, Eric Schmidt, Xavier Niel, Yann LeCun, Rodolphe Saadé, Olivier Pomel, Ilkka Paananen, Thomas Wolf, Guillermo...[4][9]

People

Neil Zeghidour, CEO & Co-founder[3][5][9]

Olivier Teboul, CTO & Co-founder[3][5][9]

Laurent Mazaré, Co-founder[3][5][9]

Alexandre Défossez, Co-founder & Chief Science Officer[3][5][9]

Constance Grisoni, Chief Growth Officer[1][15]