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: o3 Mini
Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: o3 Mini are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
OpenAI o3-mini is a cost-efficient language model optimized for STEM reasoning tasks, particularly excelling in science, mathematics, and coding. This model supports the `reasoning_effort` parameter, which can be set to "high", "medium", o…
Model details →Side-by-side comparison
| Capability | Google: Gemini 3.1 Pro Preview Custom Tools | OpenAI: o3 Mini | 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 | $1.10 | 🏆 OpenAI: o3 Mini |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $12.00 | $4.40 | 🏆 OpenAI: o3 Mini |
| 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 | Yes | Tie |
Frequently asked questions
Is Google: Gemini 3.1 Pro Preview Custom Tools better than OpenAI: o3 Mini?
Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: o3 Mini 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: o3 Mini?
Input: $2.00 vs $1.10 per 1M tokens. Output: $12.00 vs $4.40 per 1M tokens.
What context windows do Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: o3 Mini support?
Google: Gemini 3.1 Pro Preview Custom Tools supports up to 1.0M tokens. OpenAI: o3 Mini supports up to 200K tokens.
Do both Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: o3 Mini support tool calling?
Google: Gemini 3.1 Pro Preview Custom Tools: yes. OpenAI: o3 Mini: yes.