Model Comparison

GLM-4.5-Air vs GPT-5 nanoWhich is better in 2026?

GLM-4.5-Air significantly outperforms across most benchmarks.

Verdict: GLM-4.5-Air vs GPT-5 nano — which is better?

GLM-4.5-Air (by Zhipu AI) and GPT-5 nano (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

GLM-4.5-Air outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while GPT-5 nano is better at 0 benchmarks. GLM-4.5-Air significantly outperforms across most benchmarks.

Choose GLM-4.5-Air if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you need open weights you can self-host or fine-tune

Choose GPT-5 nano if…

  • you want the most recent training data — it shipped Aug 2025

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GLM-4.5-Air outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while GPT-5 nano is better at 0 benchmarks.

GLM-4.5-Air significantly outperforms across most benchmarks.

Fri Jul 10 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5 nano specifies input context (400,000 tokens). Only GPT-5 nano specifies output context (128,000 tokens).

Zhipu AI
GLM-4.5-Air
Input- tokens
Output- tokens
OpenAI
GPT-5 nano
Input400,000 tokens
Output128,000 tokens
Fri Jul 10 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5 nano supports multimodal inputs, whereas GLM-4.5-Air does not.

GPT-5 nano can handle both text and other forms of data like images, making it suitable for multimodal applications.

GLM-4.5-Air

Text
Images
Audio
Video

GPT-5 nano

Text
Images
Audio
Video

License

Usage and distribution terms

GLM-4.5-Air is licensed under MIT, while GPT-5 nano uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

GLM-4.5-Air

MIT

Open weights

GPT-5 nano

Proprietary

Closed source

Release Timeline

When each model was launched

GLM-4.5-Air was released on 2025-07-28, while GPT-5 nano was released on 2025-08-07.

GPT-5 nano is 0 month newer than GLM-4.5-Air.

GLM-4.5-Air

Jul 28, 2025

11 months ago

GPT-5 nano

Aug 7, 2025

11 months ago

1w newer

Knowledge Cutoff

When training data ends

GPT-5 nano has a documented knowledge cutoff of 2024-05-30, while GLM-4.5-Air's cutoff date is not specified.

We can confirm GPT-5 nano's training data extends to 2024-05-30, but cannot make a direct comparison without GLM-4.5-Air's cutoff date.

GLM-4.5-Air

—

GPT-5 nano

May 2024

Outputs Comparison

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Key Takeaways

Zhipu AI
Has open weights
Higher GPQA score (75.0% vs 71.2%)
Higher Humanity's Last Exam score (10.6% vs 8.7%)
OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GLM-4.5-Air and GPT-5 nano side-by-side, then vote on the output you prefer.

GLM-4.5-Air
✓ Preferred
GPT-5 nano
Open in Playground
AI Model Comparison Table
Feature
Zhipu AI
GLM-4.5-Air
OpenAI
GPT-5 nano

FAQ

Common questions about GLM-4.5-Air vs GPT-5 nano.

Which is better, GLM-4.5-Air or GPT-5 nano?

GLM-4.5-Air significantly outperforms across most benchmarks. GLM-4.5-Air is made by Zhipu AI and GPT-5 nano is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GLM-4.5-Air compare to GPT-5 nano in benchmarks?

GLM-4.5-Air scores MATH-500: 98.1%, AIME 2024: 89.4%, MMLU-Pro: 81.4%, TAU-bench Retail: 77.9%, BFCL-v3: 76.4%. GPT-5 nano scores AIME 2025: 85.2%, HMMT 2025: 75.6%, GPQA: 71.2%, FrontierMath: 9.6%, Humanity's Last Exam: 8.7%.

What are the context window sizes for GLM-4.5-Air and GPT-5 nano?

GLM-4.5-Air supports an unknown number of tokens and GPT-5 nano supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GLM-4.5-Air and GPT-5 nano?

Key differences include multimodal support (no vs yes), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes GLM-4.5-Air and GPT-5 nano?

GLM-4.5-Air is developed by Zhipu AI and GPT-5 nano is developed by OpenAI.

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