DeepSeek-V3.1 vs GPT-5.1
DeepSeek vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 59.8)
- •DeepSeek-V3.1 is cheaper ($0.21 vs $1.25 per 1M input)
- •GPT-5.1 has a larger context window (400K)
| DeepSeek-V3.1 | GPT-5.1 | |
|---|---|---|
| Intelligence index | 59.8 | 89 |
| Developer | DeepSeek | OpenAI |
| Type | LLM | LLM |
| Access | Open weights | API only |
| Context window | 163,840 tokens | 400,000 tokens |
| Input price | $0.21 / 1M | $1.25 / 1M |
| Output price | $0.79 / 1M | $10.00 / 1M |
| Speed | — | 115 tok/s |
| Released | August 21, 2025 | November 12, 2025 |
| Parameters | 671B (37B active) | — |
| Input modalities | Text | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
DeepSeek-V3.1
GPT-5.1
AIME 2025
49.8
94
GPQA Diamond
74.9
88.1
Humanity’s Last Exam
15.9
26.5
LiveCodeBench
56.4
86.8
MMLU-Pro
83.7
87