GPT-5.1 vs Llama 3.1 405B Instruct
OpenAI vs Meta — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 60.9)
- •Llama 3.1 405B Instruct is cheaper ($0.89 vs $1.25 per 1M input)
- •GPT-5.1 is faster
- •GPT-5.1 has a larger context window (400K)
| GPT-5.1 | Llama 3.1 405B Instruct | |
|---|---|---|
| Intelligence index | 89 | 60.9 |
| Developer | OpenAI | Meta |
| Type | LLM | LLM |
| Access | API only | Open weights |
| Context window | 400,000 tokens | 128,000 tokens |
| Input price | $1.25 / 1M | $0.89 / 1M |
| Output price | $10.00 / 1M | $0.89 / 1M |
| Speed | 115 tok/s | 100 tok/s |
| Released | November 12, 2025 | July 23, 2024 |
| Parameters | — | 405000000000 |
| Input modalities | Text, Image | — |
| Output modalities | Text | — |
Shared benchmarks
GPT-5.1
Llama 3.1 405B Instruct
AIME 2025
94
3
GPQA Diamond
88.1
50.7
Humanity’s Last Exam
26.5
4.2
LiveCodeBench
86.8
30.5
MMLU-Pro
87
73.3