Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...
Model details →Google: Gemini 3.1 Pro Preview Custom Tools vs OpenAI: GPT-5.5
Google: Gemini 3.1 Pro Preview Custom Tools wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
Model details →Side-by-side comparison
| Capability | Google: Gemini 3.1 Pro Preview Custom Tools | OpenAI: GPT-5.5 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.0M | 1.1M | 🏆 OpenAI: GPT-5.5 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.00 | $5.00 | 🏆 Google: Gemini 3.1 Pro Preview Custom Tools |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $12.00 | $30.00 | 🏆 Google: Gemini 3.1 Pro Preview Custom Tools |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Google: Gemini 3.1 Pro Preview Custom Tools better than OpenAI: GPT-5.5?
Google: Gemini 3.1 Pro Preview Custom Tools wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: GPT-5.5?
Input: $2.00 vs $5.00 per 1M tokens. Output: $12.00 vs $30.00 per 1M tokens.
What context windows do Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: GPT-5.5 support?
Google: Gemini 3.1 Pro Preview Custom Tools supports up to 1.0M tokens. OpenAI: GPT-5.5 supports up to 1.1M tokens.
Do both Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: GPT-5.5 support tool calling?
Google: Gemini 3.1 Pro Preview Custom Tools: yes. OpenAI: GPT-5.5: yes.
Compare Google: Gemini 3.1 Pro Preview Custom Tools with other models
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