Model Comparison

GLM-4.5-Air vs Grok-1.5

GLM-4.5-Air significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GLM-4.5-Air outperforms in 2 benchmarks (GPQA, MMLU-Pro), while Grok-1.5 is better at 0 benchmarks.

GLM-4.5-Air significantly outperforms across most benchmarks.

Tue Apr 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Cost data unavailable.

Lowest available price from all providers
Tue Apr 21 2026 • llm-stats.com
Zhipu AI
GLM-4.5-Air
Input tokens$0.00
Output tokens$0.00
Best providerUnknown Organization
xAI
Grok-1.5
Input tokens$0.00
Output tokens$0.00
Best providerUnknown Organization
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License

Usage and distribution terms

GLM-4.5-Air is licensed under MIT, while Grok-1.5 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-1.5

Proprietary

Closed source

Release Timeline

When each model was launched

GLM-4.5-Air was released on 2025-07-28, while Grok-1.5 was released on 2024-03-28.

GLM-4.5-Air is 16 months newer than Grok-1.5.

GLM-4.5-Air

Jul 28, 2025

8 months ago

1.3yr newer
Grok-1.5

Mar 28, 2024

2.1 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

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Key Takeaways

Zhipu AI
Has open weights
Higher GPQA score (75.0% vs 35.9%)
Higher MMLU-Pro score (81.4% vs 51.0%)
xAI

Detailed Comparison

AI Model Comparison Table
Feature
Zhipu AI
GLM-4.5-Air
xAI
Grok-1.5

FAQ

Common questions about GLM-4.5-Air vs Grok-1.5

GLM-4.5-Air significantly outperforms across most benchmarks. GLM-4.5-Air is made by Zhipu AI and Grok-1.5 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
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-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%.
Key differences include licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.
GLM-4.5-Air is developed by Zhipu AI and Grok-1.5 is developed by xAI.