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GPT-5 nano vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 13.0% higher average benchmark score. Grok 4 Fast offers 1.5M more tokens in context window than GPT-5 nano. Both models have similar pricing. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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OpenAI
GPT-5 Nano was developed as the most compact variant in the GPT-5 family, designed for deployment in resource-constrained environments and edge computing scenarios. Built to bring next-generation AI capabilities to devices and applications where latency and efficiency are paramount, it distills GPT-5 innovations into a minimal footprint.
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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.
21 days newer
GPT-5 nano
OpenAI
2025-08-07
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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GPT-5 nano
Input:$0.05
Output:$0.40($0.25 cheaper)
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Grok 4 Fast
Input:$0.20
Output:$0.50
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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GPT-5 nano
Average Score:77.3%
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Grok 4 Fast
Average Score:90.3%(+13.0%)
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Knowledge Cutoff
Training data recency comparison
GPT-5 nano
2024-05-30
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5 nano
2 providers
OpenAI
Throughput: 500 tok/s
Latency: 0.3ms
ZeroEval
Throughput: 500 tok/s
Latency: 0.3ms
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GPT-5 nano
Avg Score:77.3%
Providers:2
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Grok 4 Fast
Avg Score:90.3%(+13.0%)
Providers:1