> ## AI Agent Context
> Get the complete documentation index at: https://aistudio.google.com/llms.txt
> Use this file to discover all available pages.
> For the full documentation in a single file, fetch: https://aistudio.google.com/llms-full.txt

# Gemini 3.1 Pro preview

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.

{% button href="https://aistudio.google.com/prompts/new_chat?model=gemini-3.1-pro-preview" variant="ais" %}
  Try in Google AI Studio

{% /button %}

## Documentation  {% id="documentation" %}

Visit the [Gemini 3 Developer Guide](/docs/latest-model) page for full coverage
of features and capabilities.

## gemini-3.1-pro-preview  {% id="gemini-31-pro-preview" %}

{% table variant="model" %}
  * Property
  * Description

  ---

  *     {% section class="model-property" %}
  {% icon name="id_card" /%}Model code

    {% /section %}

  * `gemini-3.1-pro-preview`

  ---

  *     {% section class="model-property" %}
  {% icon name="save" /%}Supported data types

    {% /section %}

  *     **Inputs** Text, Image, Video, Audio, and PDF

    **Output** Text


  ---

  *     {% section class="model-property" %}
  {% icon name="token_auto" /%}Token limits{% sup %}[[*]](/docs/tokens){% /sup %}

    {% /section %}

  *     **Input token limit** 1,048,576

    **Output token limit** 65,536


  ---

  *     {% section class="model-property" %}
  {% icon name="handyman" /%}Capabilities

    {% /section %}

  *     {% section class="three-column-grid" %}
  {% section %}
  **Audio generation**

  {% badge type="not-supported" /%}

  {% /section %}

  {% section %}
  **Batch API**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **Caching**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **Code execution**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **File search**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **Flex inference**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **Function calling**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **Grounding with Google Maps**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **Image generation**

  {% badge type="not-supported" /%}

  {% /section %}

  {% section %}
  **Live API**

  {% badge type="not-supported" /%}

  {% /section %}

  {% section %}
  **Priority inference**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **Search grounding**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **Structured outputs**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **Thinking**

  {% badge type="supported" /%}

  {% /section %}

  {% section %}
  **URL context**

  {% badge type="supported" /%}

  {% /section %}

    {% /section %}


  ---

  *     {% section class="model-property" %}
  {% icon name="123" /%}Versions

    {% /section %}

  *     Read the [model version patterns](/docs/models#model-versions) for more details.

    *   Preview: `gemini-3.1-pro-preview`
    *   Preview: [`gemini-3.1-pro-preview-customtools`](/docs/models/gemini-3.1-pro-preview#gemini-31-pro-preview-customtools)


  ---

  *     {% section class="model-property" %}
  {% icon name="calendar_month" /%}Latest update

    {% /section %}

  * February 2026

  ---

  *     {% section class="model-property" %}
  {% icon name="id_card" /%}Model card

    {% /section %}

  * [Model card](https://deepmind.google/models/model-cards/gemini-3-1-pro/)

  ---

  *     {% section class="model-property" %}
  {% icon name="paid" /%}Pricing

    {% /section %}

  * [Pricing](/docs/pricing#gemini-3.1-pro-preview)
{% /table %}

#### gemini-3.1-pro-preview-customtools  {% id="gemini-31-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.