Synthesia Style Avatars from a prompt: the Sume avatar input types
Synthesia's Avatar Builder makes Style Avatars from a prompt and a preset. Sume creates avatars from a Prompt, a Profile or an Image, one job per avatar.
Synthesia's Avatar Builder creates Style Avatars, which its launch post describes as stylized, branded avatars, from a prompt and a preset, with reference images listed as coming soon. Sume has three avatar input types on POST /v1/avatar-1.0/generate: a Prompt, a Profile and an Image. It documents no preset input.
Synthesia facts are from its launch post. Sume facts are from Create new avatar, read 2026-10-01.
What is a Style Avatar?
Per the post, Style Avatars are stylized cartoon and character avatars powered by Express-3, aimed at brand mascots and at topics where a human presenter may not land. You name one, pair it with a voice and use it in Assistant.
How do Sume's three inputs compare?
Each request is a job. Poll it, then use the returned avatar handle or resource id to generate avatar videos. The handle may include a leading @; Sume stores it without one.
| Input | API input.type | Use it when |
|---|---|---|
| Prompt | Text description | You want an avatar from text only |
| Profile | props (for example ethnicity, sex, age) | Your app already has profile details |
| Image | photo with image_url | You have a reference image |
What must an image URL satisfy?
image_url must be a fetchable public HTTPS image URL. Localhost, private-network URLs, non-HTTPS URLs and non-image responses are rejected before generation is submitted. See the credits-per-option comparison for how an avatar job is billed.
Can I get a cartoon or mascot look?
Describe it in the Prompt input and inspect the result. The docs do not list a style catalog, so treat the look as something you iterate on. Send an Idempotency-Key so a retried create does not make a second avatar.
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