Gemini 2.5 Flash vs Gemini 3.1 Pro 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 2.5 Flash vs Gemini 3.1 Pro Preview: side by side
| Spec | Gemini 2.5 Flash | Gemini 3.1 Pro Preview | Winner |
|---|---|---|---|
| Intelligence | 20.6 | 57.2 | Gemini 3.1 Pro Preview |
| Output speed | 208 t/s | 133 t/s | Gemini 2.5 Flash |
| Output price | $2.50/1M | $12.00/1M | Gemini 2.5 Flash |
| Context | 1049K | 1049K | Tie |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | Tie |
Gemini 2.5 Flash
Pros
- +Broad native support for multiple input modalities
- +Efficient handling of very large contexts
- +Strong balance of speed and capability
- +Versatile across text, vision and audio tasks
Cons
- –Lower peak performance than larger Gemini variants on complex tasks
- –Speed optimizations may reduce depth on nuanced reasoning
- –Practical limits on full 1M-token context utilization
Gemini 3.1 Pro Preview
Pros
- +Handles up to 1M token contexts
- +Native support for audio, image, video, and text
- +Strong integration of multiple modalities
- +Effective for large-scale document analysis
Cons
- –Preview model may show inconsistent outputs
- –High resource use with maximum context
- –Requires verification on complex tasks
Frequently asked questions
It depends on your needs. Gemini 2.5 Flash and Gemini 3.1 Pro 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.