GPT-5.1-Codex vs Seed 1.6
OpenAI vs ByteDance — benchmarks, pricing, and capabilities side by side.
- •Seed 1.6 is cheaper ($0.25 vs $1.25 per 1M input)
- •GPT-5.1-Codex has a larger context window (400K)
| GPT-5.1-Codex | Seed 1.6 | |
|---|---|---|
| Intelligence index | 88.2 | — |
| Developer | OpenAI | ByteDance |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 262,144 tokens |
| Input price | $1.25 / 1M | $0.25 / 1M |
| Output price | $10.00 / 1M | $2.00 / 1M |
| Speed | 188 tok/s | — |
| Released | November 13, 2025 | December 23, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Image, Text, Video |
| Output modalities | Text | Text |