Gemini 3.1 Flash Lite Preview is Google's high-efficiency model optimized for high-volume use cases. It outperforms Gemini 2.5 Flash Lite on overall quality and approaches Gemini 2.5 Flash performance across key capabilities. Improvements s…
Model details →Google: Gemini 3.1 Flash Lite Preview vs Google: Gemini 3.1 Pro Preview Custom Tools
Google: Gemini 3.1 Flash Lite Preview wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party or user-defined functions are available. This specialized …
Model details →Side-by-side comparison
| Capability | Google: Gemini 3.1 Flash Lite Preview | Google: Gemini 3.1 Pro Preview Custom Tools | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.0M | 1.0M | Tie |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.25 | $2.00 | 🏆 Google: Gemini 3.1 Flash Lite Preview |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $1.50 | $12.00 | 🏆 Google: Gemini 3.1 Flash Lite Preview |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Google: Gemini 3.1 Flash Lite Preview better than Google: Gemini 3.1 Pro Preview Custom Tools?
Google: Gemini 3.1 Flash Lite Preview wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Google: Gemini 3.1 Flash Lite Preview and Google: Gemini 3.1 Pro Preview Custom Tools?
Input: $0.25 vs $2.00 per 1M tokens. Output: $1.50 vs $12.00 per 1M tokens.
What context windows do Google: Gemini 3.1 Flash Lite Preview and Google: Gemini 3.1 Pro Preview Custom Tools support?
Google: Gemini 3.1 Flash Lite Preview supports up to 1.0M tokens. Google: Gemini 3.1 Pro Preview Custom Tools supports up to 1.0M tokens.
Do both Google: Gemini 3.1 Flash Lite Preview and Google: Gemini 3.1 Pro Preview Custom Tools support tool calling?
Google: Gemini 3.1 Flash Lite Preview: yes. Google: Gemini 3.1 Pro Preview Custom Tools: yes.