Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview is a text model from 
Google Vertex AI with a context window of 1.0M tokens and max output of 66K tokens. Pricing starts at 2.00 per million input tokens and 12.00 per million output tokens (cheapest at Google Gemini).
Capabilities
✓ Vision✓ Function Calling✓ Reasoning✓ JSON Schema✓ System Messages✓ Web Search✓ Prompt Caching✓ Audio Input✗ Audio Output
Specifications
| Model Key | vertex_ai/gemini-3.1-pro-preview |
| Provider | Google Vertex AI |
| Provider ID | vertex_ai |
| Mode | Text |
| Canonical Name | gemini-pro-3.1 |
| Context Window | 1.0M tokens |
| Max Output | 66K tokens |
Pricing
| Type | Per 1K Tokens | Per 1M Tokens |
|---|---|---|
| Input Tokens | 0.0020 | 2.00 |
| Output Tokens | 0.012 | 12.00 |
| Cache Read (Input) | 0.000200 | 0.200 |
Price Comparison by Provider
Compare prices for Gemini 3.1 Pro Preview across different providers. The same model may be available through multiple providers at different price points.
Provider | Model Key | Input Price, $ | Output Price, $ |
|---|---|---|---|
| Google Vertex AI | vertex_ai/gemini-3.1-pro-preview | 2.00 | 12.00 |
 Google Gemini | gemini/gemini-3.1-pro-preview | 2.00 | 12.00 |
 Google Vertex AI | gemini-3.1-pro-preview | 2.00 | 12.00 |
All Variants
All available versions, regions, and API endpoints for Gemini 3.1 Pro Preview.
Model Key | Provider | Mode | Input Price, $ | Output Price, $ | Context | Max Output | Vision | Functions |
|---|---|---|---|---|---|---|---|---|
| gemini/gemini-3.1-pro-preview | Google Gemini | Text | 2.00 | 12.00 | 1.0M | 66K | yes | yes |
| gemini/gemini-3.1-pro-preview-customtools | Google Gemini | Text | 2.00 | 12.00 | 1.0M | 66K | yes | yes |
| gemini-3.1-pro-preview | Google Vertex AI | Text | 2.00 | 12.00 | 1.0M | 66K | yes | yes |
| gemini-3.1-pro-preview-customtools | Google Vertex AI | Text | 2.00 | 12.00 | 1.0M | 66K | yes | yes |
| vertex_ai/gemini-3.1-pro-preview | Google Vertex AI | Text | 2.00 | 12.00 | 1.0M | 66K | yes | yes |
| vertex_ai/gemini-3.1-pro-preview-customtools | Google Vertex AI | Text | 2.00 | 12.00 | 1.0M | 66K | yes | yes |