tokevenGPTvsGemini
GPT 5.6 Luna vs Gemini 3.5 Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
GPT 5.6 Luna
Fast / BudgetGemini 3.5 Flash
Fast / BudgetInput $/MTok
$0.20
$1.50
Output $/MTok
$1.20
$9.00
Cache discount
90% off
90% off
Context
922K
1.0M
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
62
vs
61
Code Review
68
vs
65
Summarization
57
vs
76
Q&A
85
vs
84
Extraction
74
vs
73
Reasoning
86
vs
82
Classification
91
vs
92
Creative Writing
69
vs
75
GPT 5.6 Luna
Gemini 3.5 Flash
Guidance
When to use GPT 5.6 Luna vs Gemini 3.5 Flash
Choose GPT 5.6 Luna when...
- -You need strong reasoning (confidence 86 vs 82)
- -You need strong q&a (confidence 85 vs 84)
- -You need strong extraction (confidence 74 vs 73)
- -You need strong code review (confidence 68 vs 65)
- -Cost matters: 87% cheaper on input tokens
Choose Gemini 3.5 Flash when...
- -You need strong classification (confidence 92 vs 91)
- -You need strong summarization (confidence 76 vs 57)
- -You need strong creative writing (confidence 75 vs 69)
- -You need a larger context window (1.0M vs 922K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.6 Luna
Gemini 3.5 Flash
100K tokens
$0.05Cheaper
$0.38
1M tokens
$0.82Cheaper
$3.75
10M tokens
$8.20Cheaper
$37.50
FAQ
When should I use GPT 5.6 Luna instead of Gemini 3.5 Flash?
GPT 5.6 Luna outperforms Gemini 3.5 Flash for Code Generation, Code Review, Q&A. It costs $0.20/$1.20 per million tokens (input/output).
Is Gemini 3.5 Flash cheaper than GPT 5.6 Luna?
Gemini 3.5 Flash input costs $1.50/MTok, which is 650% more than GPT 5.6 Luna at $0.20/MTok.
What are the context window sizes for GPT 5.6 Luna and Gemini 3.5 Flash?
GPT 5.6 Luna has a 922K token context window. Gemini 3.5 Flash has a 1.0M 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 Gemini 3.5 Flash 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.