Model Comparison

GLM-4.5-Air vs Grok 4.5Which is better in 2026?

Grok 4.5 significantly outperforms across most benchmarks.

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

GLM-4.5-Air (by Zhipu AI) and Grok 4.5 (by xAI) 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 0 benchmarks, while Grok 4.5 is better at 1 benchmark (GPQA). Grok 4.5 significantly outperforms across most benchmarks.

Choose GLM-4.5-Air if…

  • you need open weights you can self-host or fine-tune

Choose Grok 4.5 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 2026

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

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

Grok 4.5 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 Grok 4.5 specifies input context (500,000 tokens).

Zhipu AI
GLM-4.5-Air
Input- tokens
Output- tokens
xAI
Grok 4.5
Input500,000 tokens
Output- tokens
Sun Jul 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

Grok 4.5 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

Grok 4.5

Text
Images
Audio
Video

License

Usage and distribution terms

GLM-4.5-Air is licensed under MIT, while Grok 4.5 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

Grok 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

GLM-4.5-Air was released on 2025-07-28, while Grok 4.5 was released on 2026-07-16.

Grok 4.5 is 12 months newer than GLM-4.5-Air.

GLM-4.5-Air

Jul 28, 2025

12 months ago

Grok 4.5

Jul 16, 2026

1 weeks ago

11mo newer

Knowledge Cutoff

When training data ends

Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while GLM-4.5-Air's cutoff date is not specified.

We can confirm Grok 4.5's training data extends to 2026-02-01, but cannot make a direct comparison without GLM-4.5-Air's cutoff date.

GLM-4.5-Air

—

Grok 4.5

Feb 2026

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Zhipu AI
Has open weights
xAI
Larger context window (500,000 tokens)
Supports multimodal inputs
Higher GPQA score (93.0% vs 75.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

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

GLM-4.5-Air
✓ Preferred
Grok 4.5
Open in Playground
AI Model Comparison Table
Feature
Zhipu AI
GLM-4.5-Air
xAI
Grok 4.5

FAQ

Common questions about GLM-4.5-Air vs Grok 4.5.

Which is better, GLM-4.5-Air or Grok 4.5?

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

How does GLM-4.5-Air compare to Grok 4.5 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%. Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%.

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

GLM-4.5-Air supports an unknown number of tokens and Grok 4.5 supports 500K 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 Grok 4.5?

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 Grok 4.5?

GLM-4.5-Air is developed by Zhipu AI and Grok 4.5 is developed by xAI.

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