Get Classifier Version | Extend Documentation

from extend_ai import Extend
client = Extend(
    token="YOUR_TOKEN_HERE",
    extend_api_version="2026-02-09",
)
client.classifier_versions.retrieve(
    classifier_id="classifier_id_here",
    version_id="draft",
)

{
  "object": "classifier_version",
  "id": "clv_xK9mLPqRtN3vS8wF5hB2cQ",
  "description": "Added new document types for Q4 processing",
  "version": "draft",
  "config": {
    "classifications": [
      {
        "id": "my_unique_id",
        "type": "invoice",
        "description": "An invoice is a document that lists the items purchased and the total amount due."
      }
    ],
    "baseProcessor": "classification_performance",
    "baseVersion": "3.2.0",
    "classificationRules": "Remember, when it comes to differentiating between invoices and purchase orders, the most important thing to look for is the date of the document.",
    "advancedOptions": {
      "context": "default",
      "advancedMultimodalEnabled": true,
      "memoryEnabled": false,
      "pageRanges": [
        {
          "start": 1,
          "end": 10
        },
        {
          "start": 20,
          "end": 30
        }
      ]
    },
    "parseConfig": {
      "target": "markdown",
      "chunkingStrategy": {
        "type": "page",
        "options": {
          "minCharacters": 500,
          "maxCharacters": 10000
        }
      },
      "engine": "parse_performance",
      "engineVersion": "latest",
      "blockOptions": {
        "figures": {
          "enabled": true,
          "figureImageClippingEnabled": true,
          "advancedChartExtractionEnabled": false,
          "customInstructions": "string"
        },
        "tables": {
          "targetFormat": "html",
          "tableHeaderContinuationEnabled": false,
          "cellBlocksEnabled": false,
          "agentic": {
            "enabled": false,
            "customInstructions": "string"
          },
          "enabled": true
        },
        "text": {
          "signatureDetectionEnabled": false,
          "agentic": {
            "enabled": false,
            "customInstructions": "string"
          }
        },
        "keyValue": {
          "blankFieldFormattingEnabled": false
        },
        "barcodes": {
          "imageClippingEnabled": false,
          "readingEnabled": false
        },
        "formulas": {
          "enabled": false
        }
      },
      "advancedOptions": {
        "pageRotationEnabled": true,
        "pageRanges": [
          {
            "start": 1,
            "end": 10
          },
          {
            "start": 20,
            "end": 30
          }
        ],
        "excelParsingMode": "basic",
        "excelSkipHiddenContent": false,
        "excelUseRawCellValues": false,
        "excelSkipCalculation": true,
        "excelIncludeCellMetadata": false,
        "excelIncludeCellFormatting": false,
        "verticalGroupingThreshold": 1,
        "returnOcr": {
          "words": false
        },
        "alwaysConvertToPdf": false,
        "enrichmentFormat": "xml",
        "imageConversionQuality": "medium",
        "formattingDetection": [
          {
            "type": "change_tracking"
          }
        ]
      }
    }
  },
  "classifierId": "cl_Xj8mK2pL9nR4vT7qY5wZ",
  "createdAt": "2024-03-21T16:45:00Z",
  "createdBy": {
    "type": "user",
    "email": "matt@extend.app"
  }
}

Retrieve a specific version of a classifier in Extend

Authentication

AuthorizationBearer

Bearer authentication of the form Bearer <token>, where token is your auth token.

Path parameters

classifierIdstringRequired

The ID of the classifier.

Example: "cl_Xj8mK2pL9nR4vT7qY5wZ"

versionIdstringRequired

The version to retrieve. Accepts any of the following:

"draft" — returns the current draft version
"latest" — returns the latest published version (falls back to draft if none published)
A version number (e.g. "0.1", "1.0") — returns that specific published version
A version ID (e.g. "clsv_QYk6jgHA_8CsO8rVWhyNC") — returns that specific version by ID

Headers

Response

Successfully retrieved classifier version

objectenum

The type of object. Will always be "classifier_version".

Allowed values:

idstring

The unique identifier for this version of the classifier.

Example: "clv_xK9mLPqRtN3vS8wF5hB2cQ"

descriptionstring or null

A description of this version of the classifier.

Example: "Added new document types for Q4 processing"

versionstring

The version number or identifier for this specific version of the classifier. The draft version will have version=“draft”.

Examples: "1.0", "2.1", "draft"

configobject

The configuration settings for this version of the classifier.

classifierIdstring

The ID of the classifier that this version belongs to.

Example: "cl_Xj8mK2pL9nR4vT7qY5wZ"

createdAtstringformat: "date-time"

The time (in UTC) at which the object was created. Will follow the RFC 3339 format.

Example: "2024-03-21T16:45:00Z"

createdByobject

The actor that created this resource.

user — the resource was created via the studio by a logged-in user. The user’s email is exposed.
api_key — the resource was created via the API using an API key. The key’s name is exposed.

May be null for resources created before attribution.

Errors

400

Bad Request Error

401

Unauthorized Error

402

Payment Required Error

403

Forbidden Error

404

Not Found Error

422

Unprocessable Entity Error

429

Too Many Requests Error

500

Internal Server Error