GLM-5.1 vs Claude Code (Opus 4.6): One-Shot Three.js Racing Game Eval

Melvin Vivas · X video post · 2026-04-13 · 0:25 · 115 views · Open on X

Topics: AI Dev Tools & Productivity, LLM Fundamentals, Industry Trends & Job Market · Level: beginner

Summary

This is a short post with a video and no narration. It shares a quoted post claiming that Z.ai's GLM-5.1 model did better than Claude Code (Opus 4.6) on an informal test: building a Three.js racing game. The quoted author was impressed that GLM-5.1 got car physics with working drift mechanics right on the first try. They also liked how well it kept improving its own output. It is an anecdotal comparison of coding models, not a formal benchmark.

Key points

• GLM-5.1 is a model from Z.ai (@Zai_org), shown here as a challenger to Claude Code running Opus 4.6 for coding work.
• The test was informal: ask the model to build a Three.js racing game and judge the result.
• GLM-5.1 reportedly got car physics with real drift mechanics right in one shot. The author calls this hard to do.
• The author's favorite strength was how well it iterates on its own work (the caption is cut off at this point).
• Building a small, demanding project like a physics game is a quick hands-on way to compare coding models. Results from one person's test are anecdotal.

Resources mentioned

• Z.ai (@Zai_org) on X · person · x.com · free
  Official X account of Z.ai, maker of the GLM models and the GLM coding plan.
  Also in: Open models now dominate token volume on Vercel AI Gateway (Melvin Vivas on X · notes), GLM 5.3 Open Weights Release Delayed for Framework Support (Melvin Vivas on X · notes), AI News Roundup: Claude Fable 5, Scientist AI, ZCode, NVIDIA RL (Melvin Vivas on X · notes), Trying ZCode by Z.ai with GLM 5.2 on a Mac (Melvin Vivas on X · notes) and 9 more
• GLM-5.1 · tool · huggingface.co · free
  Open-source large language model from Z.ai (Zhipu), built for coding and long-running agent tasks.
  Also in: GLM-5.1 Reportedly Beats Claude Opus 4.6 on Cybersecurity (Melvin Vivas on X · notes), Open-Source GLM-5.1 Beats GPT-5.4 on SWE-Bench Pro (Melvin Vivas on X · notes), GLM-5.1: Open-Source Model for Long-Running Coding Agents (Melvin Vivas on X · notes), GLM-5.1 Now Available on the GLM Coding Plan (Melvin Vivas on X · notes)
• Claude Code · tool · code.claude.com · paid · recommended by both Bashiri Smith & Melvin Vivas
  Build agents and pipelines from the terminal; the guide's main agentic coding tool.
  Also in: Create Claude Code Plugins with /plugin-authoring (Melvin Vivas on X · notes), Claude Code mods: customize behavior and UI with plugins (Melvin Vivas on X · notes), AI Engineer Roadmap Overview: From ML Foundations to RAG, Agents & Ops (Bashiri Smith on Facebook · notes), SkillsBento: Free Plugin Marketplace for Codex and Claude Code (Melvin Vivas on X · notes) and 101 more
• Claude Opus 4.6 · tool · anthropic.com · paid
  Anthropic's Claude Opus model, version 4.6, which Claude Code was running in this comparison.
  Also in: GLM-5.1 Reportedly Beats Claude Opus 4.6 on Cybersecurity (Melvin Vivas on X · notes), MiniMax 2.7 One-Shots a Linear Clone at 95% Lower Cost (Melvin Vivas on X · notes), When one coding model gets stuck, switch to another (Melvin Vivas on X · notes), Codex 5.3 vs Claude Opus 4.6 Side by Side in Cursor (Melvin Vivas on X · notes)
• Three.js · tool · x.com · free
  JavaScript 3D graphics library whose browser-rendered scenes can become video frames.
  Also in: Building a 3D Flight Scene with Sonnet in Cursor, three.js and 3D Models (Melvin Vivas on X · notes), Vibe-Coding a 3D Human Anatomy App with Three.js and GPT 5.6 (Melvin Vivas on X · notes), Building a Three.js Scene with Claude Opus 5 in Claude Desktop (Melvin Vivas on X · notes), HyperFrames: Let Coding Agents Turn HTML into MP4 Videos (Melvin Vivas on X · notes)

Try this

• Ask a coding model to build a Three.js racing game with car physics and drift mechanics, as an informal way to test and compare coding models.