Gemini 2.5 Pro 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 2.5 Pro vs Gemini 3.1 Pro Preview Custom Tools: side by side
| Spec | Gemini 2.5 Pro | Gemini 3.1 Pro Preview Custom Tools | Winner |
|---|---|---|---|
| Intelligence | 27 | — | Tie |
| Output speed | 132 t/s | — | Tie |
| Output price | $10.00/1M | $12.00/1M | Gemini 2.5 Pro |
| Context | 1049K | 1049K | Tie |
| Params | — | — | Tie |
| Provider | Tie |
Gemini 2.5 Pro
Pros
- +Very large context window for extended inputs
- +Native support for multiple modalities in one model
- +Strong integration of text with visual and audio data
Cons
- –Higher latency on very large multimodal inputs
- –Performance can vary with extremely long contexts
- –Dependent on Google infrastructure for access
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 2.5 Pro 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.