tokevenGemini 3.1 Pro vs Gemini 3.5 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 3.5 Flash
Fast / BudgetQuality
Task confidence comparison
Guidance
When to use Gemini 3.1 Pro vs Gemini 3.5 Flash
Choose Gemini 3.1 Pro when...
- -You need strong reasoning (confidence 90 vs 60)
- -You need strong summarization (confidence 87 vs 85)
- -You need strong q&a (confidence 87 vs 84)
- -You need strong code generation (confidence 86 vs 68)
Choose Gemini 3.5 Flash when...
- -You need strong classification (confidence 92 vs 86)
- -You need strong extraction (confidence 90 vs 85)
- -Cost matters: 25% cheaper on input tokens
At scale
Cost at scale
FAQ
When should I use Gemini 3.1 Pro instead of Gemini 3.5 Flash?
Gemini 3.1 Pro outperforms Gemini 3.5 Flash for Reasoning, Code Generation, Code Review. It costs $2.00/$12.00 per million tokens (input/output).
Is Gemini 3.5 Flash cheaper than Gemini 3.1 Pro?
Yes. Gemini 3.5 Flash input costs $1.50/MTok vs $2.00/MTok for Gemini 3.1 Pro, saving 25% on input.
What are the context window sizes for Gemini 3.1 Pro and Gemini 3.5 Flash?
Gemini 3.1 Pro has a 1,000K token context window. Gemini 3.5 Flash has a 1,000K 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 3.5 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.