ElevenLabs Voice Cloning and Voice Design API vs Soniox Voice Cloning

ElevenLabs Voice Cloning and Voice Design API

Instant clones from 1 to 2 minutes of audio on the $6 Starter plan. Instant clones rely on an attestation, not a check.

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.

ElevenLabs Voice Cloning and Voice Design API

1. Keep the source samples. A clone can't be downloaded and re-cloning sounds slightly different
2. Check requires_verification in the create response before using the voice ID
3. List your own clones with GET /v2/voices?category=cloned instead of paging the whole library
4. On system_busy retry with backoff. On too_many_concurrent_requests queue instead, the plan cap won't lift
5. PVC is asynchronous. Create, add samples, verify, train, then poll fine_tuning_state

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