What is Gradium?
Low-latency voice APIs for speech, transcription and cloning.
Who is Gradium best for?
Gradium is best for developers building real-time voice agents that need fast speech and transcription.
Real-time voice agents
Streaming WebSocket APIs return first audio in about 200 ms, with Python and Rust SDKs and support for LiveKit and Pipecat.
Speech in and out from one account
Text-to-speech, transcription and live translation all draw on the same monthly credit balance.
Custom brand voices
An instant clone needs about 10 seconds of audio, and the M plan and above add Pro clones trained on 30 minutes or more.
Offline and on-premises apps
A 100M-parameter speech model runs offline on a CPU, and the API can also be self-hosted or run on your own servers.
How much does Gradium cost?
Gradium has a free plan with 45,000 credits a month, about an hour of speech, and paid plans run from $13 a month for XS to $1,615 a month for L, with Enterprise priced on request.
- 45,000 credits a month, about 1 hour of text-to-speech
- API and Studio access, 5 custom voices
- Not for commercial use
- 225,000 credits a month, about 5 hours of text-to-speech or 21 hours of transcription
- Commercial use, up to 1,000 custom voices
- Extra credits at $6.9 per 100,000
- 900,000 credits a month, about 20 hours of text-to-speech or 83 hours of transcription
- Commercial use, up to 1,000 custom voices
- Extra credits at $5.0 per 100,000
- 9M credits a month, about 200 hours of text-to-speech or 833 hours of transcription
- 5 Pro voice clones
- Extra credits at $4.0 per 100,000
L is $1,615 a month for 45M credits and 20 Pro voice clones, and Enterprise, with unlimited credits, is priced on request. Billed yearly, XS is $12, S $39, M $312 and L $1,480 a month. Text-to-speech uses 1 credit per character, transcription 3 credits a second, speech-to-text translation 4 and speech-to-speech translation 30. Plan credits expire at the end of each month; pay-as-you-go credits roll over. Full pricing on gradium.ai. We checked these prices on .
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Questions about Gradium
What is Gradium?
Low-latency voice APIs for speech, transcription and cloning.
Who is Gradium for?
Gradium is best for developers building real-time voice agents that need fast speech and transcription.
Is Gradium free?
Yes. Gradium has a free plan: 45,000 credits a month, about 1 hour of text-to-speech.
How much does Gradium cost?
Gradium's paid plans are XS at $13 per month, S at $43 per month and M at $340 per month.
Where can I try Gradium?
On its official website, gradium.ai.
How far do Gradium credits go?
Gradium text-to-speech uses 1 credit per character, so about 45,000 credits make an hour of audio. Transcription uses 3 credits a second, speech-to-text translation 4 and speech-to-speech translation 30. Plan credits lapse at the end of each month, but pay-as-you-go credits roll over.
Which languages does Gradium support?
Gradium supports English, French, Spanish, Portuguese and German, with more languages in development. A single session can run for up to 300 seconds, so longer text or audio has to be split across several sessions.
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