tokevenGemini 2.5 Flash vs Gemini 3.1 Pro Custom Tools
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Gemini 2.5 Flash
Fast / BudgetGemini 3.1 Pro Custom Tools
Mid-tierQuality
Task confidence comparison
Guidance
When to use Gemini 2.5 Flash vs Gemini 3.1 Pro Custom Tools
Choose Gemini 2.5 Flash when...
- -Cost matters: 85% cheaper on input tokens
Choose Gemini 3.1 Pro Custom Tools when...
- Similar performance; consider provider preference or ecosystem fit.
At scale
Cost at scale
FAQ
When should I use Gemini 2.5 Flash instead of Gemini 3.1 Pro Custom Tools?
Gemini 2.5 Flash and Gemini 3.1 Pro Custom Tools perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 3.1 Pro Custom Tools cheaper than Gemini 2.5 Flash?
Gemini 3.1 Pro Custom Tools input costs $2.00/MTok, which is 567% more than Gemini 2.5 Flash at $0.30/MTok.
What are the context window sizes for Gemini 2.5 Flash and Gemini 3.1 Pro Custom Tools?
Gemini 2.5 Flash has a 1,048.576K token context window. Gemini 3.1 Pro Custom Tools 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.
Gemini 2.5 Flash pricing & benchmarks
$0.30 / $2.50 per MTok
Gemini 2.5 Flash cost calculator
All Gemini models
Gemini 2.5 Flash pricing history
Gemini 3.1 Pro Custom Tools pricing & benchmarks
$2.00 / $12.00 per MTok
Gemini 3.1 Pro Custom Tools cost calculator
All Gemini models
Gemini 3.1 Pro Custom Tools pricing history
Other comparisons
How Gemini 2.5 Flash and Gemini 3.1 Pro Custom Tools 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.