Gemini 3.1 Pro Preview Custom Tools vs Gemini 3 Flash Preview
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 Pro Preview Custom Tools vs Gemini 3 Flash Preview: side by side
| Spec | Gemini 3.1 Pro Preview Custom Tools | Gemini 3 Flash Preview | Winner |
|---|---|---|---|
| Intelligence | — | 46.4 | Tie |
| Output speed | — | 188 t/s | Tie |
| Output price | $12.00/1M | $3.00/1M | Gemini 3 Flash Preview |
| Context | 1049K | 1049K | Tie |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | Tie |
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
Gemini 3 Flash Preview
Pros
- +Broad native support for text, image, audio, video and files
- +Efficient handling of very large contexts
- +Fast inference suitable for preview use
Cons
- –Preview status may include occasional instability
- –Reasoning depth can be shallower than full-scale models
- –No native tool-use or external browsing mentioned
Frequently asked questions
It depends on your needs. Gemini 3.1 Pro Preview Custom Tools and Gemini 3 Flash Preview are both multimodal models; the comparison table above shows where each one leads on the metrics that matter. See the verdict for a recommendation.