GLM-5.2 vs Seed 2.1 Pro
GLM-5.2 and Seed 2.1 Pro are closely matched at 46.5 and 47.0 on the LLM Stats Score.
Zhipu AI · ByteDance · Updated for 2026
Which is better?
GLM-5.2 and Seed 2.1 Pro are closely matched on the overall LLM Stats Score at 46.5 and 47.0.
In the 9 individual benchmarks reported for both models, GLM-5.2 wins 6; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GLM-5.2
- you value its reported benchmark strengths — it wins 6 of 9 exact shared results
- you need open weights you can self-host or fine-tune
Choose Seed 2.1 Pro
- you want the most recent training data — it shipped Jun 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
19 reported for GLM-5.2 · 94 for Seed 2.1 Pro
GLM-5.2 outperforms in 6 benchmarks (DeepSWE, NL2Repo, PostTrainBench, Program Bench, SWE-Bench Pro, Terminal-Bench 2.1), while Seed 2.1 Pro is better at 3 benchmarks (Humanity's Last Exam, MCP Atlas, Toolathlon).
GLM-5.2 shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only GLM-5.2 specifies input context (1,048,576 tokens). Only GLM-5.2 specifies output context (131,072 tokens).
Input capabilities
Documented input modalities across available providers
Seed 2.1 Pro supports multimodal inputs, whereas GLM-5.2 does not.
Seed 2.1 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.
GLM-5.2
Seed 2.1 Pro
License
Usage and distribution terms
GLM-5.2 is licensed under MIT, while Seed 2.1 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-5.2 was released on 2026-06-16, while Seed 2.1 Pro was released on 2026-06-24.
Seed 2.1 Pro is 0 month newer than GLM-5.2.
Jun 16, 2026
2 months ago
Jun 24, 2026
2 months ago
1w newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Outputs Comparison
Judge for yourself.
Run your own prompts against GLM-5.2 and Seed 2.1 Pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about GLM-5.2 vs Seed 2.1 Pro.