Model Comparison
GLM-4.5 vs o1-proWhich is better in 2026?
GLM-4.5 significantly outperforms across most benchmarks.
Verdict: GLM-4.5 vs o1-pro — which is better?
GLM-4.5 (by Zhipu AI) and o1-pro (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
GLM-4.5 outperforms in 2 benchmarks (AIME 2024, GPQA), while o1-pro is better at 0 benchmarks. GLM-4.5 significantly outperforms across most benchmarks.
Choose GLM-4.5 if…
- you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
- you want the most recent training data — it shipped Jul 2025
- you need open weights you can self-host or fine-tune
Choose o1-pro if…
- you are already invested in the OpenAI ecosystem
Performance Benchmarks
Comparative analysis across standard metrics
GLM-4.5 outperforms in 2 benchmarks (AIME 2024, GPQA), while o1-pro is better at 0 benchmarks.
GLM-4.5 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Context Window
Maximum input and output token capacity
Only GLM-4.5 specifies input context (131,072 tokens). Only GLM-4.5 specifies output context (131,072 tokens).
Input Capabilities
Supported data types and modalities
o1-pro supports multimodal inputs, whereas GLM-4.5 does not.
o1-pro can handle both text and other forms of data like images, making it suitable for multimodal applications.
GLM-4.5
o1-pro
License
Usage and distribution terms
GLM-4.5 is licensed under MIT, while o1-pro uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
MIT
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
GLM-4.5 was released on 2025-07-28, while o1-pro was released on 2024-12-17.
GLM-4.5 is 7 months newer than o1-pro.
Jul 28, 2025
1.0 years ago
7mo newerDec 17, 2024
1.6 years ago
Knowledge Cutoff
When training data ends
o1-pro has a documented knowledge cutoff of 2023-09-30, while GLM-4.5's cutoff date is not specified.
We can confirm o1-pro's training data extends to 2023-09-30, but cannot make a direct comparison without GLM-4.5's cutoff date.
—
Sep 2023
Outputs Comparison
Key Takeaways
GLM-4.5
View detailsZhipu AI
o1-pro
View detailsOpenAI
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GLM-4.5 and o1-pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about GLM-4.5 vs o1-pro.