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GPT-5 nano vs o3
Comprehensive side-by-side LLM comparison
o3 leads with 7.8% higher average benchmark score. GPT-5 nano offers 228.0K more tokens in context window than o3. GPT-5 nano is $9.55 cheaper per million tokens. Overall, o3 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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OpenAI
o3 represents the next generation in OpenAI's reasoning model series, developed to advance the capabilities of deliberate, step-by-step problem solving. Built to handle increasingly complex challenges across mathematics, science, and coding, it continues the evolution of reasoning-focused AI with improved analytical depth and accuracy.
3 months newer
o3
OpenAI
2025-04-16
GPT-5 nano
OpenAI
2025-08-07
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Pricing Comparison
Cost per million tokens (USD)
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GPT-5 nano
Input:$0.05
Output:$0.40($9.55 cheaper)
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o3
Input:$2.00
Output:$8.00
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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GPT-5 nano
Average Score:43.7%
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o3
Average Score:51.4%(+7.8%)
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Knowledge Cutoff
Training data recency comparison
GPT-5 nano
2024-05-30
o3
2024-05-31
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:43.7%
Providers:2
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o3
Avg Score:51.4%(+7.8%)
Providers:1