A 50-person startup just embarrassed every voice AI company...
EyeingAI@EyeingAI
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Nov 01, 2025
~2 min read
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A 50-person startup just embarrassed every voice AI company
Cartesia dropped Sonic-3... a text-to-speech model so realistic, emotional & controllable that even Elon Musk had to praise it.
Goodbye Eleven, Twelve, Thirteen Labs 😭
Here's why it's the best voice AI ever: 🧵
Cartesia dropped Sonic-3... a text-to-speech model so realistic, emotional & controllable that even Elon Musk had to praise it.
Goodbye Eleven, Twelve, Thirteen Labs 😭
Here's why it's the best voice AI ever: 🧵
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Other models freeze or lag, Sonic-3 responds in real-time, under 190 ms latency.
That’s faster than your brain can detect.
It’s why thousands of companies like ServiceNow, Cresta, and Decagon use it to handle millions of calls every month.
That’s faster than your brain can detect.
It’s why thousands of companies like ServiceNow, Cresta, and Decagon use it to handle millions of calls every month.
0:17
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What makes it wild...
– Ultra-natural voices: pacing, tone, breathing, all human-like
– Fine control: adjust speed, volume, or emphasis in real-time
– 42 languages: one voice that can speak natively in all of them (including 9 Indian languages)
– Emotion engine: laughter, excitement, empathy
– Ultra-natural voices: pacing, tone, breathing, all human-like
– Fine control: adjust speed, volume, or emphasis in real-time
– 42 languages: one voice that can speak natively in all of them (including 9 Indian languages)
– Emotion engine: laughter, excitement, empathy
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Here’s what that means in the real world 👇
– A hotel concierge that answers in any language, 24/7
– A support agent handling thousands of calls at once, empathetically
– Game NPCs that actually talk like humans
– Healthcare bots that schedule appointments and sound trustworthy
– A hotel concierge that answers in any language, 24/7
– A support agent handling thousands of calls at once, empathetically
– Game NPCs that actually talk like humans
– Healthcare bots that schedule appointments and sound trustworthy
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The tech behind it is wild
Instead of Transformers (which read the whole book to answer one line),
Sonic-3 uses State Space Models (SSMs), it reads page-by-page, like humans do.
That’s how it hits 190 ms latency while keeping crystal clarity.
Your brain literally can’t tell it’s not human.
Instead of Transformers (which read the whole book to answer one line),
Sonic-3 uses State Space Models (SSMs), it reads page-by-page, like humans do.
That’s how it hits 190 ms latency while keeping crystal clarity.
Your brain literally can’t tell it’s not human.
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Each Sonic-3 voice is fine-tunable.
You can literally tell it:
“Say that again, slower.”
“Speak louder.”
“Emphasize this part.”
It adjusts pacing, emotion, and volume instantly.
Pure control. 🔥
You can literally tell it:
“Say that again, slower.”
“Speak louder.”
“Emphasize this part.”
It adjusts pacing, emotion, and volume instantly.
Pure control. 🔥
1:01
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And the results speak for themselves
– 3–5× faster than OpenAI
– More accurate than ElevenLabs
– The same voice speaks multiple languages seamlessly
– Powering millions of calls across industries
It’s production-grade voice AI.
– 3–5× faster than OpenAI
– More accurate than ElevenLabs
– The same voice speaks multiple languages seamlessly
– Powering millions of calls across industries
It’s production-grade voice AI.
Elon Musk@elonmusk
@chongz @cartesia @buckymoore @kleinerperkins Nice
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And it is not just English.
The same voice can fluently switch between Hindi, Tamil, Bengali, Telugu, Marathi, Punjabi, and more with native-sounding accents.
Perfect for global businesses or creators who need one voice to connect everywhere.
The same voice can fluently switch between Hindi, Tamil, Bengali, Telugu, Marathi, Punjabi, and more with native-sounding accents.
Perfect for global businesses or creators who need one voice to connect everywhere.
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If you’ve ever dreamed of cloning your voice or building your own AI voice agent, now’s your chance.
Cartesia’s doing a giveaway guide on how to do it + $100 in free credits for creators and devs.
cartesia.ai
Cartesia’s doing a giveaway guide on how to do it + $100 in free credits for creators and devs.
cartesia.ai
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Done!
If this thread helped you,
👉 Repost it to help someone else.
👉 Follow @EyeingAI – I break down AI every day.
If this thread helped you,
👉 Repost it to help someone else.
👉 Follow @EyeingAI – I break down AI every day.
EyeingAI@EyeingAI
A 50-person startup just embarrassed every voice AI company
Cartesia dropped Sonic-3... a text-to-speech model so realistic, emotional & controllable that even Elon Musk had to praise it.
Goodbye Eleven, Twelve, Thirteen Labs 😭
Here's why it's the best voice AI ever: 🧵
Cartesia dropped Sonic-3... a text-to-speech model so realistic, emotional & controllable that even Elon Musk had to praise it.
Goodbye Eleven, Twelve, Thirteen Labs 😭
Here's why it's the best voice AI ever: 🧵
