# Grader Models

## Domain Types

### Grader Inputs

- `GraderInputs = array of string or ResponseInputText or object { text, type }  or 2 more`

  A list of inputs, each of which may be either an input text, output text, input
  image, or input audio object.

  - `TextInput = string`

    A text input to the model.

  - `ResponseInputText object { text, type }`

    A text input to the model.

    - `text: string`

      The text input to the model.

    - `type: "input_text"`

      The type of the input item. Always `input_text`.

      - `"input_text"`

  - `OutputText object { text, type }`

    A text output from the model.

    - `text: string`

      The text output from the model.

    - `type: "output_text"`

      The type of the output text. Always `output_text`.

      - `"output_text"`

  - `InputImage object { image_url, type, detail }`

    An image input block used within EvalItem content arrays.

    - `image_url: string`

      The URL of the image input.

    - `type: "input_image"`

      The type of the image input. Always `input_image`.

      - `"input_image"`

    - `detail: optional string`

      The detail level of the image to be sent to the model. One of `high`, `low`, or `auto`. Defaults to `auto`.

  - `ResponseInputAudio object { input_audio, type }`

    An audio input to the model.

    - `input_audio: object { data, format }`

      - `data: string`

        Base64-encoded audio data.

      - `format: "mp3" or "wav"`

        The format of the audio data. Currently supported formats are `mp3` and
        `wav`.

        - `"mp3"`

        - `"wav"`

    - `type: "input_audio"`

      The type of the input item. Always `input_audio`.

      - `"input_audio"`

### Label Model Grader

- `LabelModelGrader object { input, labels, model, 3 more }`

  A LabelModelGrader object which uses a model to assign labels to each item
  in the evaluation.

  - `input: array of object { content, role, type }`

    - `content: string or ResponseInputText or object { text, type }  or 3 more`

      Inputs to the model - can contain template strings. Supports text, output text, input images, and input audio, either as a single item or an array of items.

      - `TextInput = string`

        A text input to the model.

      - `ResponseInputText object { text, type }`

        A text input to the model.

        - `text: string`

          The text input to the model.

        - `type: "input_text"`

          The type of the input item. Always `input_text`.

          - `"input_text"`

      - `OutputText object { text, type }`

        A text output from the model.

        - `text: string`

          The text output from the model.

        - `type: "output_text"`

          The type of the output text. Always `output_text`.

          - `"output_text"`

      - `InputImage object { image_url, type, detail }`

        An image input block used within EvalItem content arrays.

        - `image_url: string`

          The URL of the image input.

        - `type: "input_image"`

          The type of the image input. Always `input_image`.

          - `"input_image"`

        - `detail: optional string`

          The detail level of the image to be sent to the model. One of `high`, `low`, or `auto`. Defaults to `auto`.

      - `ResponseInputAudio object { input_audio, type }`

        An audio input to the model.

        - `input_audio: object { data, format }`

          - `data: string`

            Base64-encoded audio data.

          - `format: "mp3" or "wav"`

            The format of the audio data. Currently supported formats are `mp3` and
            `wav`.

            - `"mp3"`

            - `"wav"`

        - `type: "input_audio"`

          The type of the input item. Always `input_audio`.

          - `"input_audio"`

      - `GraderInputs = array of string or ResponseInputText or object { text, type }  or 2 more`

        A list of inputs, each of which may be either an input text, output text, input
        image, or input audio object.

        - `TextInput = string`

          A text input to the model.

        - `ResponseInputText object { text, type }`

          A text input to the model.

        - `OutputText object { text, type }`

          A text output from the model.

          - `text: string`

            The text output from the model.

          - `type: "output_text"`

            The type of the output text. Always `output_text`.

            - `"output_text"`

        - `InputImage object { image_url, type, detail }`

          An image input block used within EvalItem content arrays.

          - `image_url: string`

            The URL of the image input.

          - `type: "input_image"`

            The type of the image input. Always `input_image`.

            - `"input_image"`

          - `detail: optional string`

            The detail level of the image to be sent to the model. One of `high`, `low`, or `auto`. Defaults to `auto`.

        - `ResponseInputAudio object { input_audio, type }`

          An audio input to the model.

    - `role: "user" or "assistant" or "system" or "developer"`

      The role of the message input. One of `user`, `assistant`, `system`, or
      `developer`.

      - `"user"`

      - `"assistant"`

      - `"system"`

      - `"developer"`

    - `type: optional "message"`

      The type of the message input. Always `message`.

      - `"message"`

  - `labels: array of string`

    The labels to assign to each item in the evaluation.

  - `model: string`

    The model to use for the evaluation. Must support structured outputs.

  - `name: string`

    The name of the grader.

  - `passing_labels: array of string`

    The labels that indicate a passing result. Must be a subset of labels.

  - `type: "label_model"`

    The object type, which is always `label_model`.

    - `"label_model"`

### Multi Grader

- `MultiGrader object { calculate_output, graders, name, type }`

  A MultiGrader object combines the output of multiple graders to produce a single score.

  - `calculate_output: string`

    A formula to calculate the output based on grader results.

  - `graders: StringCheckGrader or TextSimilarityGrader or PythonGrader or 2 more`

    A StringCheckGrader object that performs a string comparison between input and reference using a specified operation.

    - `StringCheckGrader object { input, name, operation, 2 more }`

      A StringCheckGrader object that performs a string comparison between input and reference using a specified operation.

      - `input: string`

        The input text. This may include template strings.

      - `name: string`

        The name of the grader.

      - `operation: "eq" or "ne" or "like" or "ilike"`

        The string check operation to perform. One of `eq`, `ne`, `like`, or `ilike`.

        - `"eq"`

        - `"ne"`

        - `"like"`

        - `"ilike"`

      - `reference: string`

        The reference text. This may include template strings.

      - `type: "string_check"`

        The object type, which is always `string_check`.

        - `"string_check"`

    - `TextSimilarityGrader object { evaluation_metric, input, name, 2 more }`

      A TextSimilarityGrader object which grades text based on similarity metrics.

      - `evaluation_metric: "cosine" or "fuzzy_match" or "bleu" or 8 more`

        The evaluation metric to use. One of `cosine`, `fuzzy_match`, `bleu`,
        `gleu`, `meteor`, `rouge_1`, `rouge_2`, `rouge_3`, `rouge_4`, `rouge_5`,
        or `rouge_l`.

        - `"cosine"`

        - `"fuzzy_match"`

        - `"bleu"`

        - `"gleu"`

        - `"meteor"`

        - `"rouge_1"`

        - `"rouge_2"`

        - `"rouge_3"`

        - `"rouge_4"`

        - `"rouge_5"`

        - `"rouge_l"`

      - `input: string`

        The text being graded.

      - `name: string`

        The name of the grader.

      - `reference: string`

        The text being graded against.

      - `type: "text_similarity"`

        The type of grader.

        - `"text_similarity"`

    - `PythonGrader object { name, source, type, image_tag }`

      A PythonGrader object that runs a python script on the input.

      - `name: string`

        The name of the grader.

      - `source: string`

        The source code of the python script.

      - `type: "python"`

        The object type, which is always `python`.

        - `"python"`

      - `image_tag: optional string`

        The image tag to use for the python script.

    - `ScoreModelGrader object { input, model, name, 3 more }`

      A ScoreModelGrader object that uses a model to assign a score to the input.

      - `input: array of object { content, role, type }`

        The input messages evaluated by the grader. Supports text, output text, input image, and input audio content blocks, and may include template strings.

        - `content: string or ResponseInputText or object { text, type }  or 3 more`

          Inputs to the model - can contain template strings. Supports text, output text, input images, and input audio, either as a single item or an array of items.

          - `TextInput = string`

            A text input to the model.

          - `ResponseInputText object { text, type }`

            A text input to the model.

            - `text: string`

              The text input to the model.

            - `type: "input_text"`

              The type of the input item. Always `input_text`.

              - `"input_text"`

          - `OutputText object { text, type }`

            A text output from the model.

            - `text: string`

              The text output from the model.

            - `type: "output_text"`

              The type of the output text. Always `output_text`.

              - `"output_text"`

          - `InputImage object { image_url, type, detail }`

            An image input block used within EvalItem content arrays.

            - `image_url: string`

              The URL of the image input.

            - `type: "input_image"`

              The type of the image input. Always `input_image`.

              - `"input_image"`

            - `detail: optional string`

              The detail level of the image to be sent to the model. One of `high`, `low`, or `auto`. Defaults to `auto`.

          - `ResponseInputAudio object { input_audio, type }`

            An audio input to the model.

            - `input_audio: object { data, format }`

              - `data: string`

                Base64-encoded audio data.

              - `format: "mp3" or "wav"`

                The format of the audio data. Currently supported formats are `mp3` and
                `wav`.

                - `"mp3"`

                - `"wav"`

            - `type: "input_audio"`

              The type of the input item. Always `input_audio`.

              - `"input_audio"`

          - `GraderInputs = array of string or ResponseInputText or object { text, type }  or 2 more`

            A list of inputs, each of which may be either an input text, output text, input
            image, or input audio object.

            - `TextInput = string`

              A text input to the model.

            - `ResponseInputText object { text, type }`

              A text input to the model.

            - `OutputText object { text, type }`

              A text output from the model.

              - `text: string`

                The text output from the model.

              - `type: "output_text"`

                The type of the output text. Always `output_text`.

                - `"output_text"`

            - `InputImage object { image_url, type, detail }`

              An image input block used within EvalItem content arrays.

              - `image_url: string`

                The URL of the image input.

              - `type: "input_image"`

                The type of the image input. Always `input_image`.

                - `"input_image"`

              - `detail: optional string`

                The detail level of the image to be sent to the model. One of `high`, `low`, or `auto`. Defaults to `auto`.

            - `ResponseInputAudio object { input_audio, type }`

              An audio input to the model.

        - `role: "user" or "assistant" or "system" or "developer"`

          The role of the message input. One of `user`, `assistant`, `system`, or
          `developer`.

          - `"user"`

          - `"assistant"`

          - `"system"`

          - `"developer"`

        - `type: optional "message"`

          The type of the message input. Always `message`.

          - `"message"`

      - `model: string`

        The model to use for the evaluation.

      - `name: string`

        The name of the grader.

      - `type: "score_model"`

        The object type, which is always `score_model`.

        - `"score_model"`

      - `range: optional array of number`

        The range of the score. Defaults to `[0, 1]`.

      - `sampling_params: optional object { max_completions_tokens, reasoning_effort, seed, 2 more }`

        The sampling parameters for the model.

        - `max_completions_tokens: optional number`

          The maximum number of tokens the grader model may generate in its response.

        - `reasoning_effort: optional ReasoningEffort`

          Constrains effort on reasoning for
          [reasoning models](https://platform.openai.com/docs/guides/reasoning).
          Currently supported values are `none`, `minimal`, `low`, `medium`, `high`, and `xhigh`. Reducing
          reasoning effort can result in faster responses and fewer tokens used
          on reasoning in a response.

          - `gpt-5.1` defaults to `none`, which does not perform reasoning. The supported reasoning values for `gpt-5.1` are `none`, `low`, `medium`, and `high`. Tool calls are supported for all reasoning values in gpt-5.1.
          - All models before `gpt-5.1` default to `medium` reasoning effort, and do not support `none`.
          - The `gpt-5-pro` model defaults to (and only supports) `high` reasoning effort.
          - `xhigh` is supported for all models after `gpt-5.1-codex-max`.

          - `"none"`

          - `"minimal"`

          - `"low"`

          - `"medium"`

          - `"high"`

          - `"xhigh"`

        - `seed: optional number`

          A seed value to initialize the randomness, during sampling.

        - `temperature: optional number`

          A higher temperature increases randomness in the outputs.

        - `top_p: optional number`

          An alternative to temperature for nucleus sampling; 1.0 includes all tokens.

    - `LabelModelGrader object { input, labels, model, 3 more }`

      A LabelModelGrader object which uses a model to assign labels to each item
      in the evaluation.

      - `input: array of object { content, role, type }`

        - `content: string or ResponseInputText or object { text, type }  or 3 more`

          Inputs to the model - can contain template strings. Supports text, output text, input images, and input audio, either as a single item or an array of items.

          - `TextInput = string`

            A text input to the model.

          - `ResponseInputText object { text, type }`

            A text input to the model.

          - `OutputText object { text, type }`

            A text output from the model.

            - `text: string`

              The text output from the model.

            - `type: "output_text"`

              The type of the output text. Always `output_text`.

              - `"output_text"`

          - `InputImage object { image_url, type, detail }`

            An image input block used within EvalItem content arrays.

            - `image_url: string`

              The URL of the image input.

            - `type: "input_image"`

              The type of the image input. Always `input_image`.

              - `"input_image"`

            - `detail: optional string`

              The detail level of the image to be sent to the model. One of `high`, `low`, or `auto`. Defaults to `auto`.

          - `ResponseInputAudio object { input_audio, type }`

            An audio input to the model.

          - `GraderInputs = array of string or ResponseInputText or object { text, type }  or 2 more`

            A list of inputs, each of which may be either an input text, output text, input
            image, or input audio object.

        - `role: "user" or "assistant" or "system" or "developer"`

          The role of the message input. One of `user`, `assistant`, `system`, or
          `developer`.

          - `"user"`

          - `"assistant"`

          - `"system"`

          - `"developer"`

        - `type: optional "message"`

          The type of the message input. Always `message`.

          - `"message"`

      - `labels: array of string`

        The labels to assign to each item in the evaluation.

      - `model: string`

        The model to use for the evaluation. Must support structured outputs.

      - `name: string`

        The name of the grader.

      - `passing_labels: array of string`

        The labels that indicate a passing result. Must be a subset of labels.

      - `type: "label_model"`

        The object type, which is always `label_model`.

        - `"label_model"`

  - `name: string`

    The name of the grader.

  - `type: "multi"`

    The object type, which is always `multi`.

    - `"multi"`

### Python Grader

- `PythonGrader object { name, source, type, image_tag }`

  A PythonGrader object that runs a python script on the input.

  - `name: string`

    The name of the grader.

  - `source: string`

    The source code of the python script.

  - `type: "python"`

    The object type, which is always `python`.

    - `"python"`

  - `image_tag: optional string`

    The image tag to use for the python script.

### Score Model Grader

- `ScoreModelGrader object { input, model, name, 3 more }`

  A ScoreModelGrader object that uses a model to assign a score to the input.

  - `input: array of object { content, role, type }`

    The input messages evaluated by the grader. Supports text, output text, input image, and input audio content blocks, and may include template strings.

    - `content: string or ResponseInputText or object { text, type }  or 3 more`

      Inputs to the model - can contain template strings. Supports text, output text, input images, and input audio, either as a single item or an array of items.

      - `TextInput = string`

        A text input to the model.

      - `ResponseInputText object { text, type }`

        A text input to the model.

        - `text: string`

          The text input to the model.

        - `type: "input_text"`

          The type of the input item. Always `input_text`.

          - `"input_text"`

      - `OutputText object { text, type }`

        A text output from the model.

        - `text: string`

          The text output from the model.

        - `type: "output_text"`

          The type of the output text. Always `output_text`.

          - `"output_text"`

      - `InputImage object { image_url, type, detail }`

        An image input block used within EvalItem content arrays.

        - `image_url: string`

          The URL of the image input.

        - `type: "input_image"`

          The type of the image input. Always `input_image`.

          - `"input_image"`

        - `detail: optional string`

          The detail level of the image to be sent to the model. One of `high`, `low`, or `auto`. Defaults to `auto`.

      - `ResponseInputAudio object { input_audio, type }`

        An audio input to the model.

        - `input_audio: object { data, format }`

          - `data: string`

            Base64-encoded audio data.

          - `format: "mp3" or "wav"`

            The format of the audio data. Currently supported formats are `mp3` and
            `wav`.

            - `"mp3"`

            - `"wav"`

        - `type: "input_audio"`

          The type of the input item. Always `input_audio`.

          - `"input_audio"`

      - `GraderInputs = array of string or ResponseInputText or object { text, type }  or 2 more`

        A list of inputs, each of which may be either an input text, output text, input
        image, or input audio object.

        - `TextInput = string`

          A text input to the model.

        - `ResponseInputText object { text, type }`

          A text input to the model.

        - `OutputText object { text, type }`

          A text output from the model.

          - `text: string`

            The text output from the model.

          - `type: "output_text"`

            The type of the output text. Always `output_text`.

            - `"output_text"`

        - `InputImage object { image_url, type, detail }`

          An image input block used within EvalItem content arrays.

          - `image_url: string`

            The URL of the image input.

          - `type: "input_image"`

            The type of the image input. Always `input_image`.

            - `"input_image"`

          - `detail: optional string`

            The detail level of the image to be sent to the model. One of `high`, `low`, or `auto`. Defaults to `auto`.

        - `ResponseInputAudio object { input_audio, type }`

          An audio input to the model.

    - `role: "user" or "assistant" or "system" or "developer"`

      The role of the message input. One of `user`, `assistant`, `system`, or
      `developer`.

      - `"user"`

      - `"assistant"`

      - `"system"`

      - `"developer"`

    - `type: optional "message"`

      The type of the message input. Always `message`.

      - `"message"`

  - `model: string`

    The model to use for the evaluation.

  - `name: string`

    The name of the grader.

  - `type: "score_model"`

    The object type, which is always `score_model`.

    - `"score_model"`

  - `range: optional array of number`

    The range of the score. Defaults to `[0, 1]`.

  - `sampling_params: optional object { max_completions_tokens, reasoning_effort, seed, 2 more }`

    The sampling parameters for the model.

    - `max_completions_tokens: optional number`

      The maximum number of tokens the grader model may generate in its response.

    - `reasoning_effort: optional ReasoningEffort`

      Constrains effort on reasoning for
      [reasoning models](https://platform.openai.com/docs/guides/reasoning).
      Currently supported values are `none`, `minimal`, `low`, `medium`, `high`, and `xhigh`. Reducing
      reasoning effort can result in faster responses and fewer tokens used
      on reasoning in a response.

      - `gpt-5.1` defaults to `none`, which does not perform reasoning. The supported reasoning values for `gpt-5.1` are `none`, `low`, `medium`, and `high`. Tool calls are supported for all reasoning values in gpt-5.1.
      - All models before `gpt-5.1` default to `medium` reasoning effort, and do not support `none`.
      - The `gpt-5-pro` model defaults to (and only supports) `high` reasoning effort.
      - `xhigh` is supported for all models after `gpt-5.1-codex-max`.

      - `"none"`

      - `"minimal"`

      - `"low"`

      - `"medium"`

      - `"high"`

      - `"xhigh"`

    - `seed: optional number`

      A seed value to initialize the randomness, during sampling.

    - `temperature: optional number`

      A higher temperature increases randomness in the outputs.

    - `top_p: optional number`

      An alternative to temperature for nucleus sampling; 1.0 includes all tokens.

### String Check Grader

- `StringCheckGrader object { input, name, operation, 2 more }`

  A StringCheckGrader object that performs a string comparison between input and reference using a specified operation.

  - `input: string`

    The input text. This may include template strings.

  - `name: string`

    The name of the grader.

  - `operation: "eq" or "ne" or "like" or "ilike"`

    The string check operation to perform. One of `eq`, `ne`, `like`, or `ilike`.

    - `"eq"`

    - `"ne"`

    - `"like"`

    - `"ilike"`

  - `reference: string`

    The reference text. This may include template strings.

  - `type: "string_check"`

    The object type, which is always `string_check`.

    - `"string_check"`

### Text Similarity Grader

- `TextSimilarityGrader object { evaluation_metric, input, name, 2 more }`

  A TextSimilarityGrader object which grades text based on similarity metrics.

  - `evaluation_metric: "cosine" or "fuzzy_match" or "bleu" or 8 more`

    The evaluation metric to use. One of `cosine`, `fuzzy_match`, `bleu`,
    `gleu`, `meteor`, `rouge_1`, `rouge_2`, `rouge_3`, `rouge_4`, `rouge_5`,
    or `rouge_l`.

    - `"cosine"`

    - `"fuzzy_match"`

    - `"bleu"`

    - `"gleu"`

    - `"meteor"`

    - `"rouge_1"`

    - `"rouge_2"`

    - `"rouge_3"`

    - `"rouge_4"`

    - `"rouge_5"`

    - `"rouge_l"`

  - `input: string`

    The text being graded.

  - `name: string`

    The name of the grader.

  - `reference: string`

    The text being graded against.

  - `type: "text_similarity"`

    The type of grader.

    - `"text_similarity"`