Seedance 2.0 Deep Dive: ByteDance AI Video That Tops Sora and Veo

Originally published at heyuan110.com In February 2026, ByteDance released Seedance 2.0. Within weeks, it hit #1 on the Artificial Analysis text-to-video leaderboard — beating Google Veo 3, OpenAI Sora 2, and Runway Gen-4.5 in blind human evaluation. If you are reading this from outside China, you have probably heard the buzz but face a wall of confusion: What is Dreamina? What is VolcEngine? Can you even sign up without a Chinese phone number? This guide is written specifically for international users. It covers the technical architecture in depth (why joint audio-video generation is a real breakthrough), gives an honest assessment of what works and what does not, provides a step-by-step access guide, and explains the IP controversy. Key findings: Joint audio-video generation produces the most natural lip sync of any model Multi-reference input (up to 12 files) enables director-level control 2K max resolution is a limitation vs Kling 3.0's 4K@60fps ~$0.14 per 15-second clip — 5-10x ch