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Cartesia funding, valuation and investors
Low-latency voice AI company with deep state-space and hierarchical H-Net model research.
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Funding, valuation & investors
Answer-first snapshotLatest funding
Follow-on financing (Series B in some reports; A-II in others)
$100M · October 29, 2025
Latest known valuation
Not publicly disclosed
Total disclosed equity funding
$191M
Excludes debt, grants, acquisitions, secondaries, and IPO proceeds.
Current status
private
series b · San Francisco Bay Area, United States
Investors in latest funding
Lead: Kleiner Perkins
Other: Index Ventures , Lightspeed Venture Partners , NVIDIA
Overview
Cartesia commercializes efficient voice AI, including Sonic speech generation and Ink transcription. Founded in 2023 by Stanford researchers, the company has published work on state-space models and hierarchical byte-level H-Nets. It announced a $27M seed in December 2024 and a $64M Series A in March 2025.
Market sources report a further $100M financing in October 2025, variously described as Series B or a Series A follow-on; the series designation is not settled across sources.
Why Cartesia is interesting
Co-founder Christopher Ré also coauthored Stanford's NCM paper. Cartesia's 2025–2026 H-Net and Mamba research is highly relevant to efficient hierarchical modeling, but it is not the NCM project.
Product & use cases
Sonic text-to-speech, Ink streaming transcription and voice agents, supported by efficient-model and state-space architecture research.
- Real-time voice agents
- Speech synthesis and transcription APIs
- Long-context model and hierarchical representation research
Key facts
- $27M seed (Dec 2024) and $64M Series A (Mar 2025): company primary sources
- $100M October 2025 follow-on: independently reported, series nomenclature varies
- October 2026 H-Net paper argues learned hierarchical representations reduce training compute in selected comparisons
Funding history (newest first)
Follow-on financing (Series B in some reports; A-II in others)
2025-10-29 $100MSeries A
2025-03-11 $64M- Kleiner Perkins (lead)
- Index Ventures (participant)
- Lightspeed Venture Partners (participant)
- Greycroft (participant)
- Dell Technologies Capital (participant)
- Samsung Ventures (participant)
Source: Read source · cartesia.ai
Seed
2024-12-12 $27M- Index Ventures (lead)
- Lightspeed Venture Partners (participant)
- Factory (participant)
- Conviction (participant)
- General Catalyst (participant)
- A* (participant)
- SV Angel (participant)
Source: Read source · cartesia.ai
Competitive landscape
Edge: Research pedigree in Mamba/SSM and H-Net combined with commercial latency-sensitive voice products.
Commercially competes with voice AI providers; academically explores alternative model representations. H-Net training benchmark improvements do not imply an NCM product or directly establish customer cost savings.
Market / IPO context
Editorial / static context — not a live quote.
FAQs about Cartesia
Practical answers founders, operators, and investors typically search for.
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Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.