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  • 🏆 GLM-5.2 vs Opus 4.8: Get Full #1 Open-Source Power for Free (Step-by-Step Guide)

🏆 GLM-5.2 vs Opus 4.8: Get Full #1 Open-Source Power for Free (Step-by-Step Guide)

GLM-5.2 is out, and it’s basically Opus 4.8 but free. Learn the setup, key features, and workflows so you can get results fast without any paid subscriptions.

Author

Neil Phan
June 23, 2026

TL;DR

GLM-5.2 is Z.ai's open-weight model that matches near-frontier coding performance at a fraction of the cost of Claude or GPT.

It runs on a 753-billion-parameter MoE architecture with a 1 million token context window, two reasoning modes, and an MIT license.

The model beats GLM-5.1 by a wide margin on coding benchmarks and stays close to Claude Opus 4.8 on long-horizon tasks. It also leads the Design Arena leaderboard for frontend and UI generation.

API pricing stays at $1.4 input and $4.4 output per million tokens, unchanged from GLM-5.1 despite the upgrade.

Key points

  • 81.0 on Terminal-Bench 2.1, up from 62.0 on GLM-5.1

  • Don't assume Max mode is always better; High suits most everyday tasks

  • Test on free chat before committing to API integration

🤖 Would you trust GLM-5.2 over Claude or GPT?

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Introduction

Fable 5 got banned. GLM-5.2 walked right into the gap.

It's performing on par with Claude 4.8 Opus, GPT-5.5, and Gemini 3.1 Pro across major benchmarks, and I must say it’s unusual for an open-weight model.

It handles project-scale context with stable execution and reliable adherence to engineering standards, completing full development workflows in a single task.

→ It's also topping design-focused evaluation leaderboards, beating GPT 5.5 in head-to-head comparisons. That's why everyone's talking about it.

In this article, I'll show you:

  • How strong GLM-5.2 is compared with top models

  • What the API actually costs if you build with it

  • How to start using it in just a few minutes

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