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GPT 5.6 Luna vs GPT 5.4 Nano
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.6 Luna
Fast / BudgetGPT 5.4 Nano
Fast / BudgetInput $/MTok
$0.20
$0.20
Output $/MTok
$1.20
$1.25
Cache discount
90% off
90% off
Context
922K
272K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
70
vs
0
Code Review
68
vs
0
Summarization
84
vs
0
Q&A
85
vs
0
Extraction
89
vs
0
Reasoning
63
vs
0
Classification
91
vs
0
Creative Writing
58
vs
0
GPT 5.6 Luna
GPT 5.4 Nano
Guidance
When to use GPT 5.6 Luna vs GPT 5.4 Nano
Choose GPT 5.6 Luna when...
- -You need a larger context window (922K vs 272K)
- Similar performance; consider provider preference or ecosystem fit.
Choose GPT 5.4 Nano when...
- 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 5.6 Luna
GPT 5.4 Nano
100K tokens
$0.05Cheaper
$0.05
1M tokens
$0.82
$0.52Cheaper
10M tokens
$8.20
$5.15Cheaper
FAQ
When should I use GPT 5.6 Luna instead of GPT 5.4 Nano?
GPT 5.6 Luna and GPT 5.4 Nano perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.4 Nano cheaper than GPT 5.6 Luna?
Both models have the same input pricing at $0.20/MTok. Compare output pricing: $1.20 vs $1.25/MTok.
What are the context window sizes for GPT 5.6 Luna and GPT 5.4 Nano?
GPT 5.6 Luna has a 922K token context window. GPT 5.4 Nano has a 272K 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 5.6 Luna and GPT 5.4 Nano 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.