tokevenGeminivsGemini
Gemini 3.5 Flash vs Gemini 2.5 Pro
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Gemini 3.5 Flash
Fast / BudgetGemini 2.5 Pro
Mid-tierInput $/MTok
$1.50
$1.25
Output $/MTok
$9.00
$10.00
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
68
vs
0
Code Review
65
vs
0
Summarization
85
vs
0
Q&A
84
vs
0
Extraction
90
vs
0
Reasoning
60
vs
0
Classification
92
vs
0
Creative Writing
55
vs
0
Gemini 3.5 Flash
Gemini 2.5 Pro
Guidance
When to use Gemini 3.5 Flash vs Gemini 2.5 Pro
Choose Gemini 3.5 Flash when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Gemini 2.5 Pro when...
- -Cost matters: 17% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Gemini 3.5 Flash
Gemini 2.5 Pro
100K tokens
$0.38Cheaper
$0.39
1M tokens
$3.75Cheaper
$6.25
10M tokens
$37.50Cheaper
$62.50
FAQ
When should I use Gemini 3.5 Flash instead of Gemini 2.5 Pro?
Gemini 3.5 Flash and Gemini 2.5 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 2.5 Pro cheaper than Gemini 3.5 Flash?
Yes. Gemini 2.5 Pro input costs $1.25/MTok vs $1.50/MTok for Gemini 3.5 Flash, saving 17% on input.
What are the context window sizes for Gemini 3.5 Flash and Gemini 2.5 Pro?
Gemini 3.5 Flash has a 1,048.576K token context window. Gemini 2.5 Pro 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 3.5 Flash and Gemini 2.5 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.