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: o4 Mini Deep Research
Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: o4 Mini Deep Research are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
o4-mini-deep-research is OpenAI's faster, more affordable deep research model—ideal for tackling complex, multi-step research tasks. Note: This model always uses the 'web_search' tool which adds additional cost.
Model details →Side-by-side comparison
| Capability | Google: Gemini 3.1 Pro Preview Custom Tools | OpenAI: o4 Mini Deep Research | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.0M | 200K | 🏆 Google: Gemini 3.1 Pro Preview Custom Tools |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.00 | $2.00 | Tie |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $12.00 | $8.00 | 🏆 OpenAI: o4 Mini Deep Research |
| 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: o4 Mini Deep Research?
Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: o4 Mini Deep Research are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: o4 Mini Deep Research?
Input: $2.00 vs $2.00 per 1M tokens. Output: $12.00 vs $8.00 per 1M tokens.
What context windows do Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: o4 Mini Deep Research support?
Google: Gemini 3.1 Pro Preview Custom Tools supports up to 1.0M tokens. OpenAI: o4 Mini Deep Research supports up to 200K tokens.
Do both Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: o4 Mini Deep Research support tool calling?
Google: Gemini 3.1 Pro Preview Custom Tools: yes. OpenAI: o4 Mini Deep Research: yes.