DeepSeek V3.1 Terminus vs GPT-5.1
DeepSeek vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 83.5)
- •DeepSeek V3.1 Terminus is cheaper ($0.27 vs $1.25 per 1M input)
- •GPT-5.1 has a larger context window (400K)
| DeepSeek V3.1 Terminus | GPT-5.1 | |
|---|---|---|
| Intelligence index | 83.5 | 89 |
| Developer | DeepSeek | OpenAI |
| Type | LLM | LLM |
| Access | Open weights | API only |
| Context window | 163,840 tokens | 400,000 tokens |
| Input price | $0.27 / 1M | $1.25 / 1M |
| Output price | $0.95 / 1M | $10.00 / 1M |
| Speed | — | 115 tok/s |
| Released | September 22, 2025 | November 12, 2025 |
| Parameters | — | — |
| Input modalities | Text | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
DeepSeek V3.1 Terminus
GPT-5.1
AIME 2025
89.7
94
GPQA Diamond
79.2
88.1
Humanity’s Last Exam
15.2
26.5
LiveCodeBench
79.8
86.8
MMLU-Pro
85.1
87