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 16k
Google: Gemini 3.1 Pro Preview Custom Tools wins on 4 of 6 axes — pricing and capability skew in its favour for most workloads.
This model offers four times the context length of gpt-3.5-turbo, allowing it to support approximately 20 pages of text in a single request at a higher cost. 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 16k | 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 | $3.00 | 🏆 Google: Gemini 3.1 Pro Preview Custom Tools |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $12.00 | $4.00 | 🏆 OpenAI: GPT-3.5 Turbo 16k |
| 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 16k?
Google: Gemini 3.1 Pro Preview Custom Tools wins on 4 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 16k?
Input: $2.00 vs $3.00 per 1M tokens. Output: $12.00 vs $4.00 per 1M tokens.
What context windows do Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: GPT-3.5 Turbo 16k support?
Google: Gemini 3.1 Pro Preview Custom Tools supports up to 1.0M tokens. OpenAI: GPT-3.5 Turbo 16k supports up to 16K tokens.
Do both Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: GPT-3.5 Turbo 16k support tool calling?
Google: Gemini 3.1 Pro Preview Custom Tools: yes. OpenAI: GPT-3.5 Turbo 16k: yes.