GPT-5.1 vs INTELLECT-3
OpenAI vs Prime Intellect — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 81)
- •INTELLECT-3 is cheaper ($0.20 vs $1.25 per 1M input)
- •GPT-5.1 has a larger context window (400K)
| GPT-5.1 | INTELLECT-3 | |
|---|---|---|
| Intelligence index | 89 | 81 |
| Developer | OpenAI | Prime Intellect |
| Type | LLM | LLM |
| Access | API only | Open weights |
| Context window | 400,000 tokens | 131,072 tokens |
| Input price | $1.25 / 1M | $0.20 / 1M |
| Output price | $10.00 / 1M | $1.10 / 1M |
| Speed | 115 tok/s | — |
| Released | November 12, 2025 | November 27, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.1
INTELLECT-3
AIME 2025
94
88
GPQA Diamond
88.1
76.1
Humanity’s Last Exam
26.5
12.1
LiveCodeBench
86.8
77.7
MMLU-Pro
87
82.2