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GPT 5 Nano vs GPT 6 Luna
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5 Nano
Fast / BudgetGPT 6 Luna
Fast / BudgetInput $/MTok
$0.05
$0.10
Output $/MTok
$0.40
$0.50
Cache discount
90% off
90% off
Context
272K
922K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
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Code Review
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Summarization
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0
Q&A
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0
Extraction
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0
Reasoning
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Classification
0
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Creative Writing
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0
GPT 5 Nano
GPT 6 Luna
Guidance
When to use GPT 5 Nano vs GPT 6 Luna
Choose GPT 5 Nano when...
- -Cost matters: 50% cheaper on input tokens
Choose GPT 6 Luna when...
- -You need a larger context window (922K vs 272K)
- Similar performance; consider provider preference or ecosystem fit.
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5 Nano
GPT 6 Luna
100K tokens
$0.02Cheaper
$0.02
1M tokens
$0.15Cheaper
$0.36
10M tokens
$1.55Cheaper
$3.65
FAQ
When should I use GPT 5 Nano instead of GPT 6 Luna?
GPT 5 Nano and GPT 6 Luna perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 6 Luna cheaper than GPT 5 Nano?
GPT 6 Luna input costs $0.10/MTok, which is 100% more than GPT 5 Nano at $0.05/MTok.
What are the context window sizes for GPT 5 Nano and GPT 6 Luna?
GPT 5 Nano has a 272K token context window. GPT 6 Luna has a 922K token context window.
Go deeper on either model
Per-call cost calculators, provider lineups, and price history for both models on this page.
Other comparisons
How GPT 5 Nano and GPT 6 Luna stack up against the rest of the field.
Track your real costs
Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.