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GLM 5.2 vs. Opus

techstackups.com

June 22, 2026

15 min read

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68/100

Summary

GLM-5.2 has been released, showcasing advancements in open models. In a head-to-head test, Claude Opus 4.8 outperformed GLM-5.2 by delivering a faster and more accurate 3D platformer game in raw WebGL.

Key Takeaways

GLM-5.2 is Z.ai's latest model, featuring open weights under an MIT license, allowing users to download and run it themselves or access it via an API.
In a head-to-head test, Claude Opus 4.8 outperformed GLM-5.2 by completing a 3D platformer game in 33 minutes compared to GLM-5.2's 1 hour and 10 minutes, while also producing a cleaner output.
GLM-5.2 is significantly cheaper to use, costing approximately $4.40 per 1M output tokens, compared to Opus's estimated $25 for the same amount.
GLM-5.2 is designed for long-horizon coding tasks with a 1M-token context window but is text-only and cannot process images, unlike Claude Opus.

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Community Sentiment

Mixed

Positives

GLM 5.2's output quality is commendable, demonstrating its potential for complex coding tasks despite its slower performance.
The ability to see the entire reasoning trace in GLM 5.2 allows users to understand and correct the model's decisions, enhancing user control.
Self-correcting capabilities in models like Claude Code and Opus indicate a trend towards greater autonomy in AI, which could improve long-term usability.

Concerns

GLM 5.2's performance is hindered by its slow response times, making it less efficient for real-world applications compared to competitors.
The model struggles with steering and often hallucinates, leading to inconsistencies that can frustrate users during coding tasks.
API pricing for GLM 5.2 may limit its adoption among smaller teams and individuals, as it remains less competitive against established models like Anthropic and OpenAI.