GPT-5.5 vs Seedance 2.5
| OpenAI GPT-5.5 | ByteDance Seedance 2.5 | |
|---|---|---|
| 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, video, audio |
| Output | text | video |
| Released | 2026-04-23 | 2026-07-31 |