GPT-5.1-Codex vs GPT-5.3 Chat
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1-Codex is cheaper ($1.25 vs $1.75 per 1M input)
- •GPT-5.1-Codex has a larger context window (400K)
| GPT-5.1-Codex | GPT-5.3 Chat | |
|---|---|---|
| Intelligence index | 88.2 | — |
| Developer | OpenAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 128,000 tokens |
| Input price | $1.25 / 1M | $1.75 / 1M |
| Output price | $10.00 / 1M | $14.00 / 1M |
| Speed | 188 tok/s | — |
| Released | November 13, 2025 | March 3, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |