Built to refine the performance and reliability of the Gemini 3 Pro series, Gemini 3.1 Pro Preview provides better thinking, improved token efficiency, and a more grounded, factually consistent experience. It's optimized for software engineering behavior and usability, as well as agentic workflows requiring precise tool usage and reliable multi-step execution across real-world domains. [Try in Google AI Studio](https://aistudio.google.com/prompts/new_chat?model=gemini-3.1-pro-preview) ## Documentation Visit the [Gemini 3 Developer Guide](https://ai.google.dev/gemini-api/docs/gemini-3) page for full coverage of features and capabilities. ## gemini-3.1-pro-preview | Property | Description | |---|---| | Model code | `gemini-3.1-pro-preview` | | Supported data types | **Inputs** Text, Image, Video, Audio, and PDF **Output** Text | | Token limits^[\[\*\]](https://ai.google.dev/gemini-api/docs/tokens)^ | **Input token limit** 1,048,576 **Output token limit** 65,536 | | Capabilities | **[Audio generation](https://ai.google.dev/gemini-api/docs/speech-generation)** Not supported **[Caching](https://ai.google.dev/gemini-api/docs/caching)** Supported **[Code execution](https://ai.google.dev/gemini-api/docs/code-execution)** Supported **[File search](https://ai.google.dev/gemini-api/docs/file-search)** Supported (AI Studio only) **[Function calling](https://ai.google.dev/gemini-api/docs/function-calling)** Supported **[Grounding with Google Maps](https://ai.google.dev/gemini-api/docs/maps-grounding)** Supported **[Image generation](https://ai.google.dev/gemini-api/docs/image-generation)** Not supported **[Live API](https://ai.google.dev/gemini-api/docs/live-api)** Not supported **[Search grounding](https://ai.google.dev/gemini-api/docs/google-search)** Supported **[Structured outputs](https://ai.google.dev/gemini-api/docs/structured-output)** Supported **[Thinking](https://ai.google.dev/gemini-api/docs/thinking)** Supported **[URL context](https://ai.google.dev/gemini-api/docs/url-context)** Supported | | Consumption options | **[Batch API](https://ai.google.dev/gemini-api/docs/batch-api)** Supported **[Flex inference](https://ai.google.dev/gemini-api/docs/flex-inference)** Supported **[Priority inference](https://ai.google.dev/gemini-api/docs/priority-inference)** Supported | | Versions | Read the [model version patterns](https://ai.google.dev/gemini-api/docs/models/gemini#model-versions) for more details. - Preview: `gemini-3.1-pro-preview` - Preview: `gemini-3.1-pro-preview-customtools` \* | | Latest update | February 2026 | | Model card | [Model card](https://deepmind.google/models/model-cards/gemini-3-1-pro/) | #### gemini-3.1-pro-preview-customtools \* *For those building with a mix of bash and custom tools, Gemini 3.1 Pro Preview comes with a separate endpoint available via the API called `gemini-3.1-pro-preview-customtools`. This endpoint is better at prioritizing your custom tools (for example `view_file` or `search_code`).* *Note that while `gemini-3.1-pro-preview-customtools` is optimized for agentic workflows that use custom tools and bash, you may see quality fluctuations in some use cases which don't benefit from such tools.*