o1-preview vs GLM-5.1
OpenAI o1-preview | Z.ai GLM-5.1 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | Z.ai |
| Release date | Sep 12 2024 | Apr 7 2026 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 744B |
Context window | — | 200k |
| Benchmarks | ||
Agentic terminal coding Terminal-Bench 2.0Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? (Version 2.0 of the test.) Higher is better. | — | 63.5% |
Web browsing BrowseCompCan the AI browse the web and track down hard-to-find answers? Higher is better. | — | 68% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 86.2% |
| Timeline | ||
| Release gap | o1-preview shipped 572 days before GLM-5.1 | |
Which is better: o1-preview or GLM-5.1?
o1-preview and GLM-5.1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o1-preview shipped 572 days before GLM-5.1, so benchmark comparisons should account for the intervening progress.
o1-preview is proprietary, while GLM-5.1 is open weight.
Direct benchmark comparisons are unavailable — o1-preview and GLM-5.1 don't publish scores on any of the same benchmarks.
Frequently asked questions
o1-preview was released by OpenAI on Sep 12 2024.
GLM-5.1 was released by Z.ai on Apr 7 2026.
o1-preview is a proprietary model released by OpenAI. GLM-5.1 is an open weight model released by Z.ai.
Other comparisons
o1-preview vs Claude Fable 5GLM-5.1 vs Claude Fable 5o1-preview vs Gemini OmniGLM-5.1 vs Gemini Omnio1-preview vs Muse SparkGLM-5.1 vs Muse Sparko1-preview vs Grok 4.3 BetaGLM-5.1 vs Grok 4.3 Betao1-preview vs DeepSeek-V4-ProGLM-5.1 vs DeepSeek-V4-Proo1-preview vs Mistral Medium 3.5GLM-5.1 vs Mistral Medium 3.5