Gemini 3.1 Pro Preview Custom Tools vs GPT-5.5
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 GPT-5.5: side by side
| Spec | Gemini 3.1 Pro Preview Custom Tools | GPT-5.5 | Winner |
|---|---|---|---|
| Intelligence | — | 50.8 | Tie |
| Output speed | — | 60 t/s | Tie |
| Output price | $12.00/1M | $30.00/1M | Gemini 3.1 Pro Preview Custom Tools |
| Context | 1049K | 1050K | GPT-5.5 |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | OpenAI | 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
GPT-5.5
Pros
- +Extremely large context window
- +Native support for files and images
- +Flexible multimodal workflows
- +Suitable for document-heavy tasks
Cons
- –No native audio or video support
- –Large context may increase latency
- –Performance depends on input quality across modalities
Frequently asked questions
It depends on your needs. Gemini 3.1 Pro Preview Custom Tools and GPT-5.5 are both multimodal models; the comparison table above shows where each one leads on the metrics that matter. See the verdict for a recommendation.