ByteDance Denies Seedance 2.1 Upgrade Rumors; Sources Say 20% Quality Improvement Report Not True

According to sources close to ByteDance, on May 20, the company denied market rumors that it was preparing to launch Seedance 2.1, an upgraded version of its AI video generation model Seedance 2.0. Earlier reports had claimed the new model would deliver approximately 20% improvement in generation quality. ByteDance officially released Seedance 2.0, a multimodal AI video generation model supporting text, image, audio, and video mixed inputs, in February 2026.
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