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GLM-4.5 vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 9.5% higher average benchmark score. Grok 4 Fast offers 1.8M more tokens in context window than GLM-4.5. Grok 4 Fast is $1.30 cheaper per million tokens. Grok 4 Fast supports multimodal inputs. GLM-4.5 is available on 3 providers. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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Zhipu AI
GLM-4.5 was developed by Zhipu AI as an advanced bilingual language model, designed to excel at both Chinese and English language tasks. Built to serve diverse applications across multiple languages, it represents Zhipu AI's commitment to multilingual AI capabilities.
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xAI
Grok 4 Fast is a multimodal language model developed by xAI. It achieves strong performance with an average score of 73.0% across 7 benchmarks. It excels particularly in SimpleQA (95.0%), HMMT 2025 (93.3%), AIME 2025 (92.0%). With a 2.0M token context window, it can handle extensive documents and complex multi-turn conversations. The model is available through 1 API provider. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents xAI's latest advancement in AI technology.
1 month newer
GLM-4.5
Zhipu AI
2025-07-28
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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GLM-4.5
Input:$0.40
Output:$1.60
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Grok 4 Fast
Input:$0.20
Output:$0.50($1.30 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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GLM-4.5
Average Score:48.2%
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Grok 4 Fast
Average Score:57.6%(+9.5%)
Provider Availability & Performance
Available providers and their performance metrics
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GLM-4.5
3 providers
DeepInfra
Novita
ZeroEval
Throughput: 85 tok/s
Latency: 0.7ms
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Grok 4 Fast
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GLM-4.5
Avg Score:48.2%
Providers:3
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Grok 4 Fast
Avg Score:57.6%(+9.5%)
Providers:1