GPT-5.1 vs o3
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 71.6)
- •GPT-5.1 is cheaper ($1.25 vs $2.00 per 1M input)
- •GPT-5.1 is faster
- •GPT-5.1 has a larger context window (400K)
| GPT-5.1 | o3 | |
|---|---|---|
| Intelligence index | 89 | 71.6 |
| Developer | OpenAI | OpenAI |
| Type | LLM | LLM |
| Access | API only | API only |
| Context window | 400,000 tokens | 200,000 tokens |
| Input price | $1.25 / 1M | $2.00 / 1M |
| Output price | $10.00 / 1M | $8.00 / 1M |
| Speed | 115 tok/s | 50 tok/s |
| Released | November 12, 2025 | April 16, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.1
o3
AIME 2025
94
86.4
GPQA Diamond
88.1
87.7
Humanity’s Last Exam
26.5
24.3
LiveCodeBench
86.8
80.8
MMLU-Pro
87
85.3