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No. 53 Text to Speech
Cartesia
Real-time AI voice with 40 ms latency
Cartesia's Sonic model is the lowest-latency voice synthesis in the market — 40 ms first-token, designed for live conversational AI agents, not narration.
- 2024 first launched
- Freemium pricing
- Moderate learning curve
Real-time AI voice with 40 ms latency
The Feature
About Cartesia
Cartesia is the speed pick. Where ElevenLabs optimizes for narration quality, Cartesia optimizes for real-time conversation — 40 ms first-token latency means voice agents respond before users notice. Trade-off: less emotional nuance than ElevenLabs' Multilingual v2. Best when latency is the constraint (phone agents, live translation, game NPCs).
Key Features
- 40 ms first-token latency
- Real-time streaming
- Voice cloning from 10 sec sample
- WebSocket + REST API
- Multilingual
Best For
✓ Ideal for
- Voice agents
- Live translation
- Game NPCs
Pricing
Free credits · Pay-as-you-go · Enterprise
Tags
#voice#tts#realtime#low-latency#api
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