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GET
/
v2
/
evaluator-versions
/
{version_id}
Get evaluator version
curl --request GET \
  --url https://api.arize.com/v2/evaluator-versions/{version_id} \
  --header 'Authorization: Bearer <token>'
{
  "id": "RXZhbHVhdG9yVmVyc2lvbjoxMDpYeVp3",
  "evaluator_id": "RXZhbHVhdG9yOjEyOmFCY0Q=",
  "commit_hash": "a3b1c9e4f7d2a0518e6c3bb9217f87d1c4e810f2",
  "commit_message": "Initial version",
  "type": "template",
  "template_config": {
    "name": "hallucination",
    "template": "You are an evaluation assistant...",
    "include_explanations": true,
    "use_function_calling_if_available": true,
    "classification_choices": {
      "hallucinated": 0,
      "factual": 1
    },
    "direction": "maximize",
    "data_granularity": "span",
    "llm_config": {
      "ai_integration_id": "TGxtSW50ZWdyYXRpb246MTI6YUJjRA==",
      "model_name": "gpt-4o",
      "invocation_parameters": {
        "temperature": 0
      },
      "provider_parameters": {}
    }
  },
  "created_at": "2026-02-16T22:05:48.143Z",
  "created_by_user_id": "VXNlcjoxOm5OYkM="
}

Authorizations

​
Authorization
string
header
required

Most Arize AI endpoints require authentication. For those endpoints that require authentication, include your API key in the request header using the format

Path Parameters

​
version_id
string
required

The unique evaluator version identifier (base64) A universally unique identifier (base64-encoded opaque string).

Example:

"RW50aXR5OjEyMzQ1"

Response

Returns an evaluator version

A versioned snapshot of an evaluator's configuration. Exactly one of template_config or code_config is present. The type field discriminates the branch and matches the parent evaluator's type.

​
id
string
required

The unique identifier for this version

​
evaluator_id
string
required

The parent evaluator ID

​
commit_hash
string
required

A unique hash identifying this version

​
commit_message
string | null
required

A message describing the changes in this version

​
created_at
string<date-time>
required

When this version was created

​
created_by_user_id
string | null
required

The unique identifier for the user who created this version

​
type
enum<string>
required

Discriminator identifying this as a template evaluator version. Always template for this variant.

Available options:
template
​
template_config
object
required

The LLM template configuration for this version