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GLM-5 Review 2026: Free AI Model That Rivals GPT-5

Last updated: 2026-03-27

GLM-5 from Zhipu AI is a completely free, high-performance AI model competing with GPT-5 and Claude Opus. Read our full review of features, capabilities, and who it's best for.

4.5/5

Pricing: Free

✅ Pros

  • • 100% free — no subscription needed
  • • Performance rivaling GPT-5 on many benchmarks
  • • Massive 128K context window
  • • Open-source model weights for self-hosting
  • • Fast inference speeds
  • • Strong multilingual capabilities

❌ Cons

  • • Less established ecosystem than OpenAI or Anthropic
  • • English performance slightly below GPT-5 for nuanced tasks
  • • Limited third-party integrations
  • • Web interface primarily in Chinese (API works globally)

Key Features

✦ Completely free to use
✦ 128K context window
✦ Multilingual support (80+ languages)
✦ Code generation and debugging
✦ Image understanding and analysis
✦ Reasoning and math capabilities
✦ Open-source weights available
✦ API access with generous free tier

Our Verdict

GLM-5 is the best free AI model available in 2026. If you want GPT-5-level performance without paying $20/month, GLM-5 is a no-brainer — especially for developers who can use the API or open-source weights.


What is GLM-5?


GLM-5 is the latest large language model from Zhipu AI, a Beijing-based AI company backed by Tsinghua University. Released in early 2026, GLM-5 has made waves by offering performance that rivals OpenAI's GPT-5 and Anthropic's Claude Opus — completely free.


The model supports text generation, code writing, mathematical reasoning, image understanding, and multilingual conversations across 80+ languages. It's available through both a web interface and a generous free API.


Key Features


Free Access, No Compromises

Unlike ChatGPT Plus ($20/month) or Claude Pro ($20/month), GLM-5 offers its full capabilities at zero cost. There's no watered-down free tier — you get the complete model.


128K Context Window

GLM-5 supports a 128K token context window, meaning you can feed it entire codebases, long documents, or extended conversations without losing context.


Open-Source Weights

For developers and enterprises, GLM-5's model weights are available for download and self-hosting. This means you can run it on your own infrastructure with full control over data privacy.


Strong Coding Abilities

GLM-5 performs competitively on coding benchmarks like HumanEval and SWE-bench, making it a viable free alternative to GitHub Copilot for code generation tasks.


Performance Benchmarks


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Who Should Use GLM-5?


  • Students and researchers who need powerful AI without subscription costs
  • Developers looking for a free coding assistant or API
  • Startups that want to integrate AI without per-token costs
  • Anyone who wants to try state-of-the-art AI without a credit card

    • Pricing


    GLM-5 is completely free for both the web interface and API (with generous rate limits). Enterprise plans with higher rate limits and SLAs are available for large-scale deployments.


    Bottom Line


    GLM-5 has disrupted the AI market by proving that world-class AI doesn't have to cost $20/month. While GPT-5 and Claude still edge it out on the most demanding tasks, GLM-5 is more than capable for 90% of use cases — and it won't cost you a dime.


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