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GPT 5.5 Pro vs GPT 6 Luna
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.5 Pro
FlagshipGPT 6 Luna
Fast / BudgetInput $/MTok
$30.00
$0.10
Output $/MTok
$180.00
$0.50
Cache discount
0% off
90% off
Context
1,050K
922K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
0
vs
0
Code Review
0
vs
0
Summarization
0
vs
0
Q&A
0
vs
0
Extraction
0
vs
0
Reasoning
0
vs
0
Classification
0
vs
0
Creative Writing
0
vs
0
GPT 5.5 Pro
GPT 6 Luna
Guidance
When to use GPT 5.5 Pro vs GPT 6 Luna
Choose GPT 5.5 Pro when...
- -You need a larger context window (1,050K vs 922K)
- Similar performance; consider provider preference or ecosystem fit.
Choose GPT 6 Luna when...
- -Cost matters: 100% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.5 Pro
GPT 6 Luna
100K tokens
$7.50
$0.02Cheaper
1M tokens
$123.00
$0.36Cheaper
10M tokens
$1230.00
$3.65Cheaper
FAQ
When should I use GPT 5.5 Pro instead of GPT 6 Luna?
GPT 5.5 Pro and GPT 6 Luna perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 6 Luna cheaper than GPT 5.5 Pro?
Yes. GPT 6 Luna input costs $0.10/MTok vs $30.00/MTok for GPT 5.5 Pro, saving 100% on input.
What are the context window sizes for GPT 5.5 Pro and GPT 6 Luna?
GPT 5.5 Pro has a 1,050K 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 5.5 Pro 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.