tokevenGeminivsGemini
Gemini 3.1 Pro vs Gemini 2.5 Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Gemini 3.1 Pro
Mid-tierGemini 2.5 Flash
Fast / BudgetInput $/MTok
$2.00
$0.30
Output $/MTok
$12.00
$2.50
Cache discount
90% off
90% off
Context
1,048.576K
1,048.576K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
86
vs
0
Code Review
84
vs
0
Summarization
87
vs
0
Q&A
87
vs
0
Extraction
85
vs
0
Reasoning
90
vs
0
Classification
86
vs
0
Creative Writing
84
vs
0
Gemini 3.1 Pro
Gemini 2.5 Flash
Guidance
When to use Gemini 3.1 Pro vs Gemini 2.5 Flash
Choose Gemini 3.1 Pro when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Gemini 2.5 Flash when...
- -Cost matters: 85% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Gemini 3.1 Pro
Gemini 2.5 Flash
100K tokens
$0.50
$0.10Cheaper
1M tokens
$8.20
$0.96Cheaper
10M tokens
$82.00
$9.60Cheaper
FAQ
When should I use Gemini 3.1 Pro instead of Gemini 2.5 Flash?
Gemini 3.1 Pro and Gemini 2.5 Flash perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 2.5 Flash cheaper than Gemini 3.1 Pro?
Yes. Gemini 2.5 Flash input costs $0.30/MTok vs $2.00/MTok for Gemini 3.1 Pro, saving 85% on input.
What are the context window sizes for Gemini 3.1 Pro and Gemini 2.5 Flash?
Gemini 3.1 Pro has a 1,048.576K token context window. Gemini 2.5 Flash has a 1,048.576K 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 Gemini 3.1 Pro and Gemini 2.5 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.