Open-Source GLM-5.1 Beats GPT-5.4 on SWE-Bench Pro

Melvin Vivas · X post · 2026-04-08 · Open on X

Topics: Industry Trends & Job Market, LLM Fundamentals, Evaluation (Evals) & Testing · Level: beginner

Summary

Claims that GLM-5.1, an open-source model, scores higher than GPT-5.4 on the SWE-Bench Pro coding benchmark. It shows open models competing with closed ones on real-world software engineering tasks.

Key points

• GLM-5.1 is said to beat GPT-5.4 on SWE-Bench Pro.
• GLM-5.1 is open source.
• SWE-Bench Pro measures how well a model solves real software engineering tasks.

Resources mentioned

• 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 vs Claude Code (Opus 4.6): One-Shot Three.js Racing Game Eval (Melvin Vivas on X · notes), GLM-5.1 Reportedly Beats Claude Opus 4.6 on Cybersecurity (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)
• GPT-5.4 · tool · openai.com · paid
  OpenAI frontier model (Thinking and Pro variants) for reasoning, coding and agents.
  Also in: Opinion: GPT-5.4 in Cursor 3 Replaces Opus for Coding (Melvin Vivas on X · notes), Splitting AI Tools: Cursor 3 + GPT-5.4 for Code, Claude for Learning (Melvin Vivas on X · notes), Creator's Coding Setup: Cursor 3 with GPT 5.4 (Melvin Vivas on X · notes), GPT-5.4 Is Available in OpenAI Codex (Melvin Vivas on X · notes) and 2 more
• SWE-Bench Pro · dataset · labs.scale.com · free
  Benchmark that tests whether models can solve real-world software engineering tasks.
  Also in: GLM-5.1: Open-Source Model for Long-Running Coding Agents (Melvin Vivas on X · notes)