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 or user-defined functions are available. This specialized …
Model details →Google: Gemini 3.1 Pro Preview Custom Tools vs OpenAI: GPT-3.5 Turbo
Google: Gemini 3.1 Pro Preview Custom Tools wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-3.5 Turbo is OpenAI's fastest model. It can understand and generate natural language or code, and is optimized for chat and traditional completion tasks. Training data up to Sep 2021.
Model details →Side-by-side comparison
| Capability | Google: Gemini 3.1 Pro Preview Custom Tools | OpenAI: GPT-3.5 Turbo | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.0M | 16K | 🏆 Google: Gemini 3.1 Pro Preview Custom Tools |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.00 | $0.50 | 🏆 OpenAI: GPT-3.5 Turbo |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $12.00 | $1.50 | 🏆 OpenAI: GPT-3.5 Turbo |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 Google: Gemini 3.1 Pro Preview Custom Tools |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | — | 🏆 Google: Gemini 3.1 Pro Preview Custom Tools |
Frequently asked questions
Is Google: Gemini 3.1 Pro Preview Custom Tools better than OpenAI: GPT-3.5 Turbo?
Google: Gemini 3.1 Pro Preview Custom Tools wins on 3 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-3.5 Turbo?
Input: $2.00 vs $0.50 per 1M tokens. Output: $12.00 vs $1.50 per 1M tokens.
What context windows do Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: GPT-3.5 Turbo support?
Google: Gemini 3.1 Pro Preview Custom Tools supports up to 1.0M tokens. OpenAI: GPT-3.5 Turbo supports up to 16K tokens.
Do both Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: GPT-3.5 Turbo support tool calling?
Google: Gemini 3.1 Pro Preview Custom Tools: yes. OpenAI: GPT-3.5 Turbo: yes.