ByteDance Audio Big Closed weights

Seeduplex

218 days since ByteDance announced it · 8 Apr 2026

Seeduplex is a closed-weights audio model from ByteDance, announced 8 Apr 2026.

Price: —; the lab’s list price
Parameters: —; not disclosed

No price on the lab’s own pages.

Announcement: seed.bytedance.com/en/blog/introducing-seed-full-duplex-speech-llm-attentive-listening-robust-interference-suppression-enabling-more-natural-interaction
Docs: seed.bytedance.com/seeduplex
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ByteDance ships full-duplex voice model to Doubao
08 Apr 2026

ByteDance · Big · Seeduplex

closed weights

Seeduplex 8 Apr 2026

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Seedream 5.5 9 Nov 2026
SeedRealtime 4 Aug 2026
Seedance 2.5 30 Jul 2026
Seed Audio 1.0 20 Jul 2026
Seedream 5.0 Pro 8 Jul 2026
Seed2.1 Pro 23 Jun 2026
Seedream 5.0 Lite 13 Feb 2026
Seedance 2.0 11 Feb 2026

Facts last updated 7 Nov 2026, from ByteDance’s own pages.