Seed Speech 2.0 Review: 41 Preset Voices and Delivery Instructions
One voice per request, up to 5,000 characters of script.
ByteDance's Seed Speech 2.0 text-to-speech: send a script, pick one of 41 preset voices, describe the delivery in plain language and get back an MP3. You pay per 1,000 characters, and SpicyAPI adds no content filter.
- Lydia
- Not hands-on tested · catalogue checked Oct 7, 2026
- Updated Oct 7, 2026
The verdict
We did not create new paid samples for this article. Published examples remain examples of a particular input and output, rather than a statistically controlled comparison. The illustration accompanying this article is editorial artwork, not a sample produced by the reviewed model.
What we liked and what held it back
What we liked
- Voice-overs for short videos. Narration for explainers, product clips and social posts. The price is fixed by the script length, so you know what a batch costs before you start.
- Multilingual content. Read the same script in English, Japanese, Spanish, German and more. Several voices are built to speak more than one language in the same timbre.
What held it back
- One voice per request, up to 5,000 characters of script. Output is one audio file: a 24 kHz mono MP3 unless you choose opus or another sample rate; there are no word timings or subtitles. Only the 41 preset voices are offered — no cloning, no custom voices. Speed, pitch and volume have their own sliders, and instructions can still describe the delivery in words.
What the evidence shows
We have not established a comparable public quality result for this exact served variant in the evidence used by this article. A result for a neighbouring release or a different execution mode would not fill that gap. The controls described here are verified product capabilities; they are not a newly measured naturalness, intelligibility or speed score.
A practical starting brief
The following is a starting input adapted from the model’s published examples, not a promise that every run will sound the same. Keep the words and delivery directions separate wherever the endpoint offers separate fields. Preview an ordinary sentence before extending the script; adding more adjectives rarely resolves an ambiguous instruction.
{
"instructions": "Soft, breathy and intimate, as if speaking to one person late at night.",
"text": "Hey... it's me. I know it's late. I just wanted to hear your voice before I fall asleep. Call me back? I'll be waiting.",
"voice_id": "stokie_en"
}Start with the material that determines acceptance: a name, a difficult number, a sentence with an emotional turn, or the passage you cannot afford to misread. Listen or read against the original, including the ending. Keep the input fixed while changing one control, so a difference in wording does not get mistaken for a better model. A pleasant voice alone does not prove that every word survived.
Read the current quote on the model task page before submitting. Per-character, per-second and per-request billing cannot be compared by the displayed starting number alone. Compare the same passage or recording, and include any format conversion or alignment you still need to do.
How to choose an alternative
Choose by the missing capability before comparing a headline quality number. An alternative should remove a concrete bottleneck—voice selection, a longer script, delivery direction or the right kind of transcription—rather than simply have a newer name. The current pages below show their actual tasks and price units.
What Seed Speech 2.0 can do on SpicyAPI
Straight from the live model specification on SpicyAPI. Some creators offer more in their own apps; this is what you can call through our API today.
| Feature | Text to speech |
|---|---|
| Output formats | mp3 · opus |
| Seed control | No |
| Negative prompt | No |
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Seed Speech 2.0 FAQ
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