Gemini 3.1 Pro Preview Custom Tools
retiredGoogle · Multimodal · Released Feb 2026
Gemini 3.1 Pro Preview Custom Tools is a variant of Google's Gemini 3.1 Pro optimized for improved tool use, with better discrimination between specialized third-party tools and general-purpose alternatives.
- Strengths
- Demonstrates more selective and efficient tool invocation, reducing unnecessary calls to generic utilities when purpose-built tools are available.
- Best for
- Tasks involving multiple specialized APIs or tools where the model needs to choose appropriately among options rather than falling back to general-purpose alternatives.
- Limitations
- As a preview variant, behavior may change; best suited for testing and evaluation rather than production systems requiring stability, and performance gains depend on having well-defined alternative tools available.
Input / 1M
$2.00
Output / 1M
$12.00
Cached input / 1M
$0.2
Context window
1.05M
Price history
Input (solid)Output (dashed)
Price change
- 30d
- in decreased 0.0% out decreased 0.0%
- 90d
- in decreased 0.0% out decreased 0.0%
- 1y
- in decreased 0.0% out decreased 0.0%
- Since launch
- in decreased 0.0% out decreased 0.0%
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 29 Jun 2026 | $2.00 | $12.00 | $0.2 | Imported from OpenRouter | openrouter.ai |
| 11 Jun 2026 | $2.00 | $12.00 | $0.2 | Imported from OpenRouter | openrouter.ai |