ImageAPI only
Seedream 4.0
ByteDance
Updated May 21, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error
Superseded by Seedream 4.5
Specifications
- Type
- Image
- Access
- API only
- Released
- September 5, 2025
- License
- Proprietary
- Input
- Text, Image
- Output
- Image
Our take
Unified image generation and editing model (text-to-image, multi-image edit, composition) with 2K output, ~10x faster than Seedream 3.0.