From the source
ElevenLabs is releasing SFX v3, a new sound effects model in its Sound Effects API that follows prompts with multiple instructions more closely than SFX v2 and handles vocals and music better.
- Developers switch by setting model_id to eleven_text_to_sound_v3 on the POST /v1/sound-generation endpoint, and the model picks the length of the sound effect from the prompt.
- If outputs drift, raising prompt_influence above its default of 0.3 makes generations follow the prompt more closely and vary less between runs.
- Looping still only works with eleven_text_to_sound_v2, so requests that need it should stay on v2 with loop: true.
- ElevenLabs calls SFX v3 an incremental update that is less likely to clip on high-frequency sounds like gongs, chimes and kettle whistles, and says its engineering team finds it sounds more natural overall.
- Because both models run on the same endpoint, the company suggests running common prompts through v2 and v3 to compare before switching.
