ByteDance Seed

China0 models on Stav

ByteDance Seed is the Beijing-headquartered foundation-model research arm of ByteDance (parent of TikTok), founded in 2023 with satellite labs in Singapore and the US. It releases a genuine mix of Apache-2.0/OpenMDW open-weight models (Seed-OSS, Seed-X, BAGEL, UI-TARS) alongside proprietary flagship models (Seed2.x/Doubao, Seedance, Seedream) served only via ByteDance's own Volcano Engine/BytePlus cloud in China. EU regulated customers should weigh that ByteDance's parent entity carries a Chinese state 'golden share' and board seat, was fined €530m by Ireland's DPC in 2025 for unlawful EEA-to-China data transfers (on appeal), and that no Seed-specific GDPR instrument, security certification, or EU AI Act compliance statement has been published — although third-party trackers now report ByteDance as a 2026 signatory to the EU's voluntary GPAI Code of Practice, a change from its earlier non-signatory status that could not be independently confirmed against the European Commission's own signatory list in this research pass.