tokevenGemini 3.1 Pro Custom Tools vs Gemini 3.8 Flash
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Gemini 3.1 Pro Custom Tools
Mid-tierGemini 3.8 Flash
Fast / BudgetQuality
Task confidence comparison
Guidance
When to use Gemini 3.1 Pro Custom Tools vs Gemini 3.8 Flash
Choose Gemini 3.1 Pro Custom Tools when...
- Similar performance; consider provider preference or ecosystem fit.
Choose Gemini 3.8 Flash when...
- -Cost matters: 63% cheaper on input tokens
At scale
Cost at scale
FAQ
When should I use Gemini 3.1 Pro Custom Tools instead of Gemini 3.8 Flash?
Gemini 3.1 Pro Custom Tools and Gemini 3.8 Flash perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Gemini 3.8 Flash cheaper than Gemini 3.1 Pro Custom Tools?
Yes. Gemini 3.8 Flash input costs $0.75/MTok vs $2.00/MTok for Gemini 3.1 Pro Custom Tools, saving 63% on input.
What are the context window sizes for Gemini 3.1 Pro Custom Tools and Gemini 3.8 Flash?
Gemini 3.1 Pro Custom Tools has a 1,048.576K token context window. Gemini 3.8 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.
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
Gemini 3.8 Flash pricing & benchmarks
$0.75 / $3.75 per MTok
Gemini 3.8 Flash cost calculator
All Gemini models
Gemini 3.8 Flash pricing history
Other comparisons
How Gemini 3.1 Pro Custom Tools and Gemini 3.8 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.