GPT-4.1 vs GPT-5.1-Codex
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1-Codex has the higher intelligence index (88.2 vs 63.8)
- •GPT-5.1-Codex is cheaper ($1.25 vs $2.00 per 1M input)
- •GPT-5.1-Codex is faster
- •GPT-4.1 has a larger context window (1M)
| GPT-4.1 | GPT-5.1-Codex | |
|---|---|---|
| Intelligence index | 63.8 | 88.2 |
| Developer | OpenAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 1,047,576 tokens | 400,000 tokens |
| Input price | $2.00 / 1M | $1.25 / 1M |
| Output price | $8.00 / 1M | $10.00 / 1M |
| Speed | 100 tok/s | 188 tok/s |
| Released | April 14, 2025 | November 13, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-4.1
GPT-5.1-Codex
AIME 2025
46.4
95.7
GPQA Diamond
66.3
86
Humanity’s Last Exam
5.4
23.4
LiveCodeBench
45.7
84.9
MMLU-Pro
80.6
86