GLM 4.5 Air vs GPT-5.1
Zhipu AI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 70.4)
- •GLM 4.5 Air is cheaper ($0.13 vs $1.25 per 1M input)
- •GPT-5.1 is faster
- •GPT-5.1 has a larger context window (400K)
| GLM 4.5 Air | GPT-5.1 | |
|---|---|---|
| Intelligence index | 70.4 | 89 |
| Developer | Zhipu AI | OpenAI |
| Type | LLM | LLM |
| Access | Open weights | API only |
| Context window | 131,072 tokens | 400,000 tokens |
| Input price | $0.13 / 1M | $1.25 / 1M |
| Output price | $0.85 / 1M | $10.00 / 1M |
| Speed | 63 tok/s | 115 tok/s |
| Released | July 25, 2025 | November 12, 2025 |
| Parameters | — | — |
| Input modalities | Text | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GLM 4.5 Air
GPT-5.1
AIME 2025
80.7
94
GPQA Diamond
75
88.1
Humanity’s Last Exam
10.6
26.5
LiveCodeBench
70.7
86.8
MMLU-Pro
81.4
87