Autunes is not one model. It runs a family of models called Zori, and the two you actually choose between are Zori5 Turbo and Zori5 XL. They are not a quality ladder where XL is simply better at everything — they have different strengths, and for a handful of languages the choice is made for you.
Zori5 Turbo: the sensible default
Turbo is tuned for Hindi and the major Indian languages. It is quicker to generate and costs fewer credits, which matters when you are trying five versions of a hook before you commit to one. For Hindi, Punjabi, Urdu, Bengali, Tamil, Telugu, Sanskrit and Nepali it sings natively — the pronunciation is handled by the model rather than approximated from English.
- Fastest turnaround, lowest credit cost per song.
- Native vocals for Hindi and the major Indian languages.
- Best choice while you are still iterating on lyrics or style.
Zori5 XL: higher fidelity, and required for five languages
XL is the larger model. It resolves more detail in the arrangement and generally gives a cleaner, more finished-sounding master, which is what you want for a track you are actually going to publish.
It is also not optional for everyone. Kannada, Malayalam, Marathi, Bhojpuri and Haryanvi have no native vocal support in Turbo. On XL they are handled properly. If you write in one of those five, XL is the model to use — Turbo will not give you correct pronunciation no matter how you word the prompt.
- Required for Kannada, Malayalam, Marathi, Bhojpuri and Haryanvi.
- More detail in the mix; better for a final, publishable take.
- Costs more credits and takes longer than Turbo.
A practical workflow
Draft on Turbo, finish on XL. Use Turbo to settle the lyrics, the tempo and the style — that is the stage where you generate the most and throw the most away. Once a version is close, regenerate it on XL for the take you keep.
The exception is the five XL-only languages. There, go straight to XL; drafting on Turbo will tell you nothing useful about how the final vocal will sound.