---
title: "Get Chat Completion Field Options Counts"
method: POST
path: "/v1/observability/chat-completion-fields/{field_name}/options-counts"
tags: ["beta.observability.chat_completion_events.fields"]
---

# Get Chat Completion Field Options Counts

`POST /v1/observability/chat-completion-fields/{field_name}/options-counts`

Get Chat Completion Field Options Counts

## Path parameters

- `field_name` string, required

## Request body

- FetchFieldOptionCountsRequest
  - `filter_params` FilterPayload
    - `filters` union, required
      - FilterGroup
        - `AND` union[], nullable
          - union
            - FilterGroup — recursive
            - FilterCondition
              - …
        - `OR` union[], nullable
          - union
            - FilterGroup — recursive
            - FilterCondition
              - …
      - FilterCondition
        - `field` string, required
        - `op` 'lt' | 'lte' | 'gt' | 'gte' | 'startswith' | 'istartswith' | 'endswith' | 'iendswith' | 'contains' | 'icontains' | 'matches' | 'notcontains' | 'inotcontains' | 'eq' | 'neq' | 'isnull' | 'includes' | 'excludes' | 'len_eq', required
        - `value` unknown, required

## Response `200`

Successful Response

- FetchFieldOptionCountsResponse
  - `counts` FieldOptionCountItem[], required
    - `value` string, required
    - `count` integer, required

## Other responses

- `400` — Bad Request - Invalid request parameters or data
- `404` — Not Found - Resource does not exist
- `408` — Request Timeout - Operation timed out
- `409` — Conflict - Resource conflict
- `422` — Unprocessable Entity - Validation error

## Changes

- **2026-08-14** `61436a496404` — 5 warning
  - added the new `OPTIMIZATION_TRIAL_KEY_ALREADY_EXISTS` enum value to the `detail/error_code/anyOf[subschema #1: ObservabilityErrorCode]/` response property for the response status `400`
  - added the new `OPTIMIZATION_TRIAL_KEY_ALREADY_EXISTS` enum value to the `detail/error_code/anyOf[subschema #1: ObservabilityErrorCode]/` response property for the response status `404`
  - added the new `OPTIMIZATION_TRIAL_KEY_ALREADY_EXISTS` enum value to the `detail/error_code/anyOf[subschema #1: ObservabilityErrorCode]/` response property for the response status `408`
  - added the new `OPTIMIZATION_TRIAL_KEY_ALREADY_EXISTS` enum value to the `detail/error_code/anyOf[subschema #1: ObservabilityErrorCode]/` response property for the response status `409`
  - …1 more

[Change history](https://skmtc.dev/mistral/apis/mistral-ai-api/changes/v1/observability/chat-completion-fields/:field_name/options-counts/post.md)

---

[API](https://skmtc.dev/mistral/apis/mistral-ai-api.md) · [All operations](https://skmtc.dev/mistral/apis/mistral-ai-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/mistral/mistral-ai-api/revisions/61436a496404/schema)