Doubao-Seedream-4.5 vs GPT-5.6 Luna
| ByteDance Doubao-Seedream-4.5 | OpenAI GPT-5.6 Luna | |
|---|---|---|
| Vendor | ByteDance | OpenAI |
| Context window | — | 1,050,000 |
| Max output | — | 128,000 |
| Reasoning | No | Yes |
| Tool calling | No | Yes |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | image | text |
| Released | 2025-09-25 | 2026-07-08 |