Gemini 3.1 Flash Lite Preview vs Gemini 3.1 Pro Preview Custom Tools
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Gemini 3.1 Flash Lite Preview vs Gemini 3.1 Pro Preview Custom Tools: side by side
| Spec | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview Custom Tools | Winner |
|---|---|---|---|
| Intelligence | 33.5 | — | Tie |
| Output speed | 310 t/s | — | Tie |
| Output price | $1.50/1M | $12.00/1M | Gemini 3.1 Flash Lite Preview |
| Context | 1049K | 1049K | Tie |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | Tie |
Gemini 3.1 Flash Lite Preview
Pros
- +Broad native support for multiple modalities
- +Very large context window for document and media tasks
- +Lightweight design optimized for speed
- +Unified handling of video, audio and files
Cons
- –Preview model may show inconsistent behavior
- –Lite variant trades depth for efficiency
- –Experimental features can be less reliable than stable releases
Gemini 3.1 Pro Preview Custom Tools
Pros
- +Strong cross-modal coherence on mixed inputs
- +Effective use of very large context windows
- +Flexible extension via custom tools
Cons
- –Preview status may include occasional instability
- –Large contexts can increase latency and cost
- –Tool setup requires additional configuration
Frequently asked questions
It depends on your needs. Gemini 3.1 Flash Lite Preview and Gemini 3.1 Pro Preview Custom Tools are both multimodal models; the comparison table above shows where each one leads on the metrics that matter. See the verdict for a recommendation.