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GPT-5 nano vs Grok-4 Heavy
Comprehensive side-by-side LLM comparison
Grok-4 Heavy leads with 24.7% higher average benchmark score. GPT-5 nano is available on 2 providers. Overall, Grok-4 Heavy 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 Heavy was created as a larger, more capable variant of Grok 4, designed to provide maximum reasoning depth and analytical capability. Built for the most demanding applications requiring sophisticated problem-solving, it represents xAI's flagship offering in the fourth generation.
29 days newer
Grok-4 Heavy
xAI
2025-07-09
GPT-5 nano
OpenAI
2025-08-07
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Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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GPT-5 nano
Average Score:55.0%
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Grok-4 Heavy
Average Score:79.7%(+24.7%)
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Knowledge Cutoff
Training data recency comparison
GPT-5 nano
2024-05-30
Grok-4 Heavy
2024-12-31
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:55.0%
Providers:2
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Grok-4 Heavy
Avg Score:79.7%(+24.7%)
Providers:0