Gemini 3.1 Pro Preview vs Gemini 3.5 Flash
Full comparison on pricing, capabilities, and context length — pick the right model for your use case
Which should I choose?
💰 Budget priority
Gemini 3.5 Flash is cheaper on output pricing. For output-heavy workloads (code generation, content creation), the price gap materially affects monthly cost.
📚 Long documents / large context
Gemini 3.5 Flash has the larger context window (—). Pick it for large codebases, long-form novels, or legal contracts.
💡 Hands-on recommendation
Sign up for PioMode to call both models with a single API key — just swap the `model` parameter. A $2 top-up is more than enough for side-by-side evaluation.
Frequently asked questions
Q: What's the difference between Gemini 3.1 Pro Preview and Gemini 3.5 Flash?
A: Gemini 3.1 Pro Preview (Google) and Gemini 3.5 Flash (Google) each have their own strengths in pricing, context length, and capability. Gemini 3.1 Pro Preview: input $0.286 金币/M, context —. Gemini 3.5 Flash: input $0.214 金币/M, context —. Choose based on your task profile and budget.
Q: Which is cheaper — Gemini 3.1 Pro Preview or Gemini 3.5 Flash?
A: By output price: Gemini 3.5 Flash is cheaper ($1.286 金币/M).
Q: Can I use Gemini 3.1 Pro Preview and Gemini 3.5 Flash together?
A: Yes. With PioMode, a single API key works across all supported models — just switch the `model` parameter in your code, no separate account required. Ideal for apps that need different models for different scenarios.
Q: Which is better for coding — Gemini 3.1 Pro Preview or Gemini 3.5 Flash?
A: Check the capability table above for each model's support. Claude Sonnet is widely regarded as the strongest coding model, GPT-5 is well-rounded, and DeepSeek offers standout value. We recommend trying both before committing.
One account, both models
Free trial credits on signup. Switch models by changing one line of code.