Fish Audio Voice Cloning API vs Soniox Voice Cloning

Fish Audio Voice Cloning API

Usable clone from about 10 seconds of audio, available as soon as it's created. No consent or speaker verification in the API.

Soniox Voice Cloning

One API call and a clip of up to 2 minutes. No consent capture or speaker verification, and the terms say so.

Fish Audio Voice Cloning API

1. Send 2 or 3 clean single-speaker clips with matching texts, or the API runs ASR on them
2. Pass the model _id as reference_id in TTS. Check state before relying on it
3. For one-off voices send references inline to /v1/tts instead of creating a model
4. Send the model: voice-design-1 header on voice design calls
5. Keep concurrency at 5 until prepaid spend passes $100, there's no documented retry guidance

Soniox Voice Cloning

1. Poll the voice until the target model's status is ready before using it in TTS
2. On voice_not_prepared call recompute, don't retry the TTS request
3. Don't retry voice_failed even though it's a 503. Create a new voice from a better clip
4. Use a key from the project that owns the voice, voices are per project
5. Keep the clip under 2 minutes and 35 MB, longer fails with voice_audio_too_long