GPT-5.1 Chat vs GPT-5.3-Codex
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 Chat is cheaper ($1.25 vs $1.75 per 1M input)
- •GPT-5.3-Codex has a larger context window (400K)
| GPT-5.1 Chat | GPT-5.3-Codex | |
|---|---|---|
| Intelligence index | — | 91.5 |
| Developer | OpenAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 128,000 tokens | 400,000 tokens |
| Input price | $1.25 / 1M | $1.75 / 1M |
| Output price | $10.00 / 1M | $14.00 / 1M |
| Speed | — | 73 tok/s |
| Released | November 13, 2025 | February 24, 2026 |
| Parameters | — | — |
| Input modalities | Image, Text | Text, Image |
| Output modalities | Text | Text |