> ## Documentation Index
> Fetch the complete documentation index at: https://unstructured-53-docs-243-plugins.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Named entity recognition (NER)

After partitioning and chunking, you can have Unstructured generate a list of recognized entities and their types (such as the names of organizations, products, and people) in the content, through a process known as *named entity recognition* (NER).

This NER is done by using models offered through these providers:

* [GPT-4o](https://openai.com/index/hello-gpt-4o/), provided through OpenAI.
* [Claude 3.5 Sonnet](https://www.anthropic.com/news/claude-3-5-sonnet), provided through Anthropic.

Here is an example of a list of recognized entities and their types using GPT-4o. Note specifically the `entities` field that is added.

```json theme={null}
{
    "type": "CompositeElement",
    "element_id": "bc8333ea0d374670ff0bd03c6126e70d",
    "text": "SECTION. 3\n\nThe Senate of the United States shall be composed of two Senators from each State, 
        [chosen by the Legislature there- of,]* for six Years; and each Senator shall have one Vote.\n\n
        Immediately after they shall be assembled in Consequence of the first Election, they shall be divided
        as equally as may be into three Classes. The Seats of the Senators of the first Class shall be vacated
        at the Expiration of the second Year, of the second Class at the Expiration of the fourth Year, and of
        the third Class at the Expiration of the sixth Year, so that one third may be chosen every second Year;
        [and if Vacan- cies happen by Resignation, or otherwise, during the Recess of the Legislature of any
        State, the Executive thereof may make temporary Appointments until the next Meeting of the Legislature,
        which shall then fill such Vacancies.]*\n\nC O N S T I T U T I O N O F T H E U N I T E D S T A T E S",
    "metadata": {
        "filename": "constitution.pdf",
        "filetype": "application/pdf",
        "languages": [
            "eng"
        ],
        "page_number": 2,
        "entities": [
            {
                "entity": "Senate",
                "type": "ORGANIZATION"
            },
            {
                "entity": "United States",
                "type": "LOCATION"
            },
            {
                "entity": "Senators",
                "type": "PERSON"
            },
            {
                "entity": "State",
                "type": "LOCATION"
            },
            {
                "entity": "Legislature",
                "type": "ORGANIZATION"
            },
            {
                "entity": "six Years",
                "type": "DATE"
            },
            {
                "entity": "first Election",
                "type": "EVENT"
            },
            {
                "entity": "second Year",
                "type": "DATE"
            },
            {
                "entity": "fourth Year",
                "type": "DATE"
            },
            {
                "entity": "sixth Year",
                "type": "DATE"
            },
            {
                "entity": "Executive",
                "type": "PERSON"
            },
            {
                "entity": "C O N S T I T U T I O N O F T H E U N I T E D S T A T E S",
                "type": "ARTIFACT"
            }
        ]
    }
}
```

# Generate a list of entities and their types

To generate a list of recognized entities and their types, in an **Enrichment** node in a workflow, specify the following:

<Note>
  You can change a workflow's NER settings only through [Custom](/ui/workflows#create-a-custom-workflow) workflow settings.

  Entities are only recognized when the **Partitioner** node in a workflow is also set to use the **High Res** partitioning strategy. [Learn more](/ui/partitioning).
</Note>

1. Select **Text**.

2. For **Model**, select either **OpenAI (GPT-4o)** or **Anthropic (Claude 3.5 Sonnet)**.

3. The selected model will follow a default set of instructions (called a *prompt*) to perform NER using a set of predefined entity types. To experiment
   with running the default prompt against some sample data, click **Edit**, and then click **Run Prompt**. The selected **Model** uses the
   **Prompt** to run NER on the **Input sample** and shows the results in the **Output**. Look specifically at the `response_json` field for the
   entities that were recognized and their types.

4. To customize the prompt, change the contents of **Prompt**.

   <Note>
     For best results, Unstructured strongly recommends that you limit your changes only to certain portions of the default prompt, specifically:

     * Adding, renaming, or deleting items in the list of predefined types (such as `PERSON`, `ORGANIZATION`, `LOCATION`, and so on).

     * As needed, adding any clarifying instructions only between these two lines:

       ```text theme={null}
       ...
       Provide the entities and their corresponding types as a structured JSON response.

       (Add any clarifying instructions here only.)

       [START OF TEXT]
       ...
       ```

     * Changing any other portions of the default prompt could produce unexpected results.
   </Note>

5. To experiment with different data, change the contents of **Input sample**. For best results, Unstructured strongly recommends that the JSON structure in **Input sample** be preserved.

6. When you are satisfied with the **Model** and **Prompt** that you want to use, click **Save**.