Seedance 2.5 in Symphony takes 50 references: what Sume lists

TikTok's August 3, 2026 post says Seedance 2.5 in Symphony accepts up to 50 multimodal references (image, video and audio), up from 9, and up to 30 seconds of video (read 2026-10-02). Sume's docs do not publish a single reference count for Seedance 2.5, so read the live catalog instead of assuming 50.

What TikTok says

The post says Seedance 2.5 is rolling out to select paid advertisers in select markets, through Symphony Creative Studio and Symphony Automations in TikTok Ads Manager. It adds that real face uploads remain blocked, that AI labels and invisible watermarking are applied, and that C2PA Content Credentials are included (read 2026-10-02).

What Sume documents

On Sume, seedance-2.5 accepts 4 to 30 seconds at 480p, 720p or 1080p (Video Router). References go in input_references, and only models whose supported_input_references lists a type accept that type. The docs say audio and video references are honored by the Seedance 2.x models (Video generation).

• Call the model list and read supported_input_references for seedance-2.5.
• Do not copy TikTok's 50 into your code; no Sume page I read states a count.
• Test a request with your real reference mix before you plan a batch.

What stays different

Symphony lives inside Ads Manager and labels its exports for TikTok policy. Sume returns a file from an async job, with no TikTok publishing step. If the clip will run as a TikTok ad, follow TikTok's own AI label steps.