Eleven Music v2.5: the closed-source row that turns music generation into a callable pipeline
The music generation model from ElevenLabs, currently at v2.5, released 2026-09-11 with the release post last updated 2026-09-20. We list it as the engineering-side top row for music in the audio domain, which contrasts with rather than duplicates the Suno entry already catalogued here: the value of Suno concentrates inside the product, a Studio multi-track timeline, Custom Models, up to twelve stems and MIDI export, while Eleven Music splits comparable capability into endpoints, namely compose, stream, a structured composition plan, scoring an uploaded video, uploading existing audio, stem separation, finetunes and section level inpainting, plus a marketplace where creators license tracks to each other. Choosing between them therefore needs no audio quality comparison, only one question: is this track something a person sits and adjusts, or something a pipeline requests in volume. The API surface is nine endpoints rather than one generate call, and two details matter for procurement: both compose and stem-separation take a sign_with_c2pa flag that applies to mp3 output so outgoing files can carry content credentials, and output format is tied to subscription tier, with mp3_44100_192 requiring Creator or above and pcm_44100 requiring Pro or above on stem-separation and video-to-music while compose goes up to mp3_48000_320, so the threshold for lossless differs per endpoint. The trap worth memorising is that v2.5 is already the interface default yet the model_id enum of music_v1, music_v2 and music_v2_5 still defaults to music_v1, and output_format=auto resolves per model to mp3_44100_128 on v1 and mp3_48000_192 on v2, so a minimal call that omits model_id silently gets the oldest generation at a lower bitrate; pin both in production code and name mp3_48000_320 when 320kbps is required. The two plan schemas are not interchangeable and the wrong pairing is a hard error: music_v1 takes MusicPrompt while music_v2 and music_v2_5 take CompositionPlan, whose chunks carry a text field with square bracket section names, lyric lines and curly brace inline directions. On the control surface prompt and composition_plan are mutually exclusive, and the request takes music_length_ms from 3000 to 600000, that is three seconds to ten minutes, plus force_instrumental, finetune_id and seed. Rights and commercial use are the most structured part of this line: a multi-year agreement with Universal Music Group was announced alongside v2.5 and the vendor states it is separate from Music 2.5; every track is yours on every plan including Free, Free allows commercial use provided ElevenMusic is credited, lossless downloads are capped at five per day on Free and 400 per month on Pro, tracks built on another artist song through Audio Reference cannot be downloaded, the Marketplace sells licences by usage type with creator earnings starting at 25 percent, and no licence permits distribution to streaming platforms such as Spotify. The official evidence for v2.5 over v2 is a self-run blind test in which v2.5 won the majority of 47,885 paired takes with the widest gap in vocal-led and acoustic-heavy genres. Boundaries: the API is paid-subscription only; vocals are documented for English, Spanish, German and Japanese with no Mandarin, so a Chinese language song is more practical on YuE2 or Suno; seed does not guarantee reproducibility; and it is closed source with no weights, so the self-hostable alternatives here are YuE2 for music and VoiceStudio or Kokoro-82M for speech. Graded C (vendor claim): quality was not recomputed and we ran no blind listening test, but the API contract is verifiable documentation and every clause of it is listed in the body.