Model Comparison

GLM-4.5-Air vs GPT-4Which is better in 2026?

GLM-4.5-Air significantly outperforms across most benchmarks.

Verdict: GLM-4.5-Air vs GPT-4 — which is better?

GLM-4.5-Air (by Zhipu AI) and GPT-4 (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 1 benchmarks (GPQA), while GPT-4 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 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2025
  • you need open weights you can self-host or fine-tune

Choose GPT-4 if…

  • you want predictable pricing at $30.00/M input and $60.00/M output

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GLM-4.5-Air outperforms in 1 benchmarks (GPQA), while GPT-4 is better at 0 benchmarks.

GLM-4.5-Air significantly outperforms across most benchmarks.

Sun Jul 26 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-4 specifies input context (32,768 tokens). Only GPT-4 specifies output context (32,768 tokens).

Zhipu AI
GLM-4.5-Air
Input- tokens
Output- tokens
OpenAI
GPT-4
Input32,768 tokens
Output32,768 tokens
Sun Jul 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-4 supports multimodal inputs, whereas GLM-4.5-Air does not.

GPT-4 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-4

Text
Images
Audio
Video

License

Usage and distribution terms

GLM-4.5-Air is licensed under MIT, while GPT-4 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-4

Proprietary

Closed source

Release Timeline

When each model was launched

GLM-4.5-Air was released on 2025-07-28, while GPT-4 was released on 2023-06-13.

GLM-4.5-Air is 26 months newer than GPT-4.

GLM-4.5-Air

Jul 28, 2025

12 months ago

2.1yr newer
GPT-4

Jun 13, 2023

3.1 years ago

Knowledge Cutoff

When training data ends

GPT-4 has a documented knowledge cutoff of 2022-12-31, while GLM-4.5-Air's cutoff date is not specified.

We can confirm GPT-4's training data extends to 2022-12-31, but cannot make a direct comparison without GLM-4.5-Air's cutoff date.

GLM-4.5-Air

—

GPT-4

Dec 2022

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Zhipu AI
Has open weights
Higher GPQA score (75.0% vs 35.7%)
OpenAI
Larger context window (32,768 tokens)
Supports multimodal inputs

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GLM-4.5-Air and GPT-4 side-by-side, then vote on the output you prefer.

GLM-4.5-Air
✓ Preferred
GPT-4
Open in Playground
AI Model Comparison Table
Feature
Zhipu AI
GLM-4.5-Air
OpenAI
GPT-4

FAQ

Common questions about GLM-4.5-Air vs GPT-4.

Which is better, GLM-4.5-Air or GPT-4?

GLM-4.5-Air significantly outperforms across most benchmarks. GLM-4.5-Air is made by Zhipu AI and GPT-4 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-4 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-4 scores AI2 Reasoning Challenge (ARC): 96.3%, HellaSwag: 95.3%, Uniform Bar Exam: 90.0%, SAT Math: 89.0%, LSAT: 88.0%.

What are the context window sizes for GLM-4.5-Air and GPT-4?

GLM-4.5-Air supports an unknown number of tokens and GPT-4 supports 33K 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-4?

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-4?

GLM-4.5-Air is developed by Zhipu AI and GPT-4 is developed by OpenAI.

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