GPT-5 Pro vs o3
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5 Pro has the higher intelligence index (88.4 vs 71.6)
- •o3 is cheaper ($2.00 vs $15.00 per 1M input)
- •GPT-5 Pro has a larger context window (400K)
| GPT-5 Pro | o3 | |
|---|---|---|
| Intelligence index | 88.4 | 71.6 |
| Developer | OpenAI | OpenAI |
| Type | LLM | LLM |
| Access | API only | API only |
| Context window | 400,000 tokens | 200,000 tokens |
| Input price | $15.00 / 1M | $2.00 / 1M |
| Output price | $120.00 / 1M | $8.00 / 1M |
| Speed | — | 50 tok/s |
| Released | October 6, 2025 | April 16, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5 Pro
o3
GPQA Diamond
88.4
87.7
Humanity’s Last Exam
42
24.3