GPT-5.5 vs Doubao-Seedream-5.0-pro
| OpenAI GPT-5.5 | ByteDance Doubao-Seedream-5.0-pro | |
|---|---|---|
| Vendor | OpenAI | ByteDance |
| Context window | 1,050,000 | — |
| Max output | 128,000 | — |
| Reasoning | Yes | No |
| Tool calling | Yes | No |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | image |
| Released | 2026-04-23 | 2026-07-07 |