tokevenGPTvsGemini
GPT 5.6 Luna vs Gemini 3.1 Pro
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 3.1 Pro
Mid-tierInput $/MTok
$0.20
$2.00
Output $/MTok
$1.20
$12.00
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
57
Code Review
68
vs
84
Summarization
57
vs
80
Q&A
85
vs
87
Extraction
74
vs
75
Reasoning
86
vs
84
Classification
91
vs
86
Creative Writing
69
vs
77
GPT 5.6 Luna
Gemini 3.1 Pro
Guidance
When to use GPT 5.6 Luna vs Gemini 3.1 Pro
Choose GPT 5.6 Luna when...
- -You need strong classification (confidence 91 vs 86)
- -You need strong reasoning (confidence 86 vs 84)
- -You need strong code generation (confidence 62 vs 57)
- -Cost matters: 90% cheaper on input tokens
Choose Gemini 3.1 Pro when...
- -You need strong q&a (confidence 87 vs 85)
- -You need strong code review (confidence 84 vs 68)
- -You need strong summarization (confidence 80 vs 57)
- -You need strong creative writing (confidence 77 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 3.1 Pro
100K tokens
$0.05Cheaper
$0.50
1M tokens
$0.82Cheaper
$8.20
10M tokens
$8.20Cheaper
$82.00
FAQ
When should I use GPT 5.6 Luna instead of Gemini 3.1 Pro?
GPT 5.6 Luna outperforms Gemini 3.1 Pro for Code Generation, Reasoning, Classification. It costs $0.20/$1.20 per million tokens (input/output).
Is Gemini 3.1 Pro cheaper than GPT 5.6 Luna?
Gemini 3.1 Pro input costs $2.00/MTok, which is 900% more than GPT 5.6 Luna at $0.20/MTok.
What are the context window sizes for GPT 5.6 Luna and Gemini 3.1 Pro?
GPT 5.6 Luna has a 922K token context window. Gemini 3.1 Pro 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 3.1 Pro 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.