GLM-5.1 vs GPT-5.2 Pro
GPT-5.2 Pro leads the LLM Stats Score 42.9 to 39.1. GLM-5.1 is 34.7x cheaper per token.
Zhipu AI · OpenAI · Updated for 2026
Which is better?
GPT-5.2 Pro leads the overall LLM Stats Score 42.9 to 39.1, ranking #50 overall.
The models split the 4 individual benchmarks reported for both models evenly.
On price, GLM-5.1 is roughly 34.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.2 Pro also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GLM-5.1
- cost matters — it's about 34.7x cheaper per token
- you want the most recent training data — it shipped Apr 2026
- you need open weights you can self-host or fine-tune
Choose GPT-5.2 Pro
- overall performance matters — it scores 42.9 and ranks #50 on LLM Stats
- you process long inputs — it offers a 400,000 token context window
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
18 reported for GLM-5.1 · 7 for GPT-5.2 Pro
GLM-5.1 outperforms in 2 benchmarks (BrowseComp, Humanity's Last Exam), while GPT-5.2 Pro is better at 2 benchmarks (GPQA, HMMT 2025).
Both models are evenly matched across the benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GLM-5.1 ($1.05/1M tokens) is 20.0x cheaper than GPT-5.2 Pro ($21.00/1M tokens).
For output processing, GLM-5.1 ($3.50/1M tokens) is 48.0x cheaper than GPT-5.2 Pro ($168.00/1M tokens).
In conclusion, GPT-5.2 Pro is more expensive than GLM-5.1.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5.2 Pro accepts 400,000 input tokens compared to GLM-5.1's 202,752 tokens. GLM-5.1 can generate longer responses up to 202,752 tokens, while GPT-5.2 Pro is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
GPT-5.2 Pro supports multimodal inputs, whereas GLM-5.1 does not.
GPT-5.2 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.
GLM-5.1
GPT-5.2 Pro
License
Usage and distribution terms
GLM-5.1 is licensed under MIT, while GPT-5.2 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-5.1 was released on 2026-04-07, while GPT-5.2 Pro was released on 2025-12-11.
GLM-5.1 is 4 months newer than GPT-5.2 Pro.
Apr 7, 2026
5 months ago
3mo newerDec 11, 2025
9 months ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
GLM-5.1 is available from DeepInfra, FriendliAI, ZAI. GPT-5.2 Pro is available from OpenAI.
GLM-5.1
GPT-5.2 Pro
Outputs Comparison
Judge for yourself.
Run your own prompts against GLM-5.1 and GPT-5.2 Pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about GLM-5.1 vs GPT-5.2 Pro.