Cartesia

Sonic

Ultra-low-latency TTS for voice agents. 1 credit = 1 character; shown at the Pro-plan overage rate of $65 per 1M credits (Startup $45, Scale $38).

USD per 1M characters

$65.00

Verified Oct 4, 2026

#5 cheapest of 6 in Text-to-speech & voice cloning

Capabilities, explained

What this API can do, and what each capability means for your project.

Voice cloning

Yes

Create a custom voice from a recording.

Streaming

Yes

Audio starts playing before the full text is processed: essential for live agents.

Languages

Number of supported languages.

Typical latency

90 ms

How long until the first useful output arrives. Lower is better for interactive apps; batch jobs rarely care.

Commercial use allowed

Yes

Whether outputs may be used in a commercial product under the provider's terms. Always re-check the license for your case.

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