GPT-5.1 vs Kimi K2 Thinking
OpenAI vs Moonshot AI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 85.6)
- •Kimi K2 Thinking is cheaper ($0.60 vs $1.25 per 1M input)
- •GPT-5.1 is faster
- •GPT-5.1 has a larger context window (400K)
| GPT-5.1 | Kimi K2 Thinking | |
|---|---|---|
| Intelligence index | 89 | 85.6 |
| Developer | OpenAI | Moonshot AI |
| Type | LLM | LLM |
| Access | API only | Open weights |
| Context window | 400,000 tokens | 262,144 tokens |
| Input price | $1.25 / 1M | $0.60 / 1M |
| Output price | $10.00 / 1M | $2.50 / 1M |
| Speed | 115 tok/s | 100 tok/s |
| Released | November 12, 2025 | November 6, 2025 |
| Parameters | — | 1T (32B active) |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.1
Kimi K2 Thinking
AIME 2025
94
94.7
GPQA Diamond
88.1
84.5
Humanity’s Last Exam
26.5
22.3
LiveCodeBench
86.8
85.3
MMLU-Pro
87
84.8