Get Messages Usage Report

get /v1/organizations/usage_report/messages

Get Messages Usage Report

Query Parameters

• starting_at: string

  Time buckets that start on or after this RFC 3339 timestamp will be returned. Each time bucket will be snapped to the start of the minute/hour/day in UTC.

• account_ids: optional array of string

  Restrict usage returned to the specified user account ID(s).

• api_key_ids: optional array of string

  Restrict usage returned to the specified API key ID(s).

• bucket_width: optional "1d" or "1m" or "1h"

  Time granularity of the response data.

  • "1d"

  • "1m"

  • "1h"

• context_window: optional array of "0-200k" or "200k-1M"

  Restrict usage returned to the specified context window(s).

  • "0-200k"

  • "200k-1M"

• ending_at: optional string

  Time buckets that end before this RFC 3339 timestamp will be returned.

• group_by: optional array of "api_key_id" or "workspace_id" or "model" or 6 more

  Group by any subset of the available options. Grouping by speed requires the fast-mode-2026-02-01 beta header.

  • "api_key_id"

  • "workspace_id"

  • "model"

  • "service_tier"

  • "context_window"

  • "inference_geo"

  • "speed"

  • "account_id"

  • "service_account_id"

• inference_geos: optional array of "global" or "us" or "not_available"

  Restrict usage returned to the specified inference geo(s). Use not_available for models that do not support specifying inference_geo.

  • "global"

  • "us"

  • "not_available"

• limit: optional number

  Maximum number of time buckets to return in the response.

  The default and max limits depend on bucket_width: • "1d": Default of 7 days, maximum of 31 days • "1h": Default of 24 hours, maximum of 168 hours • "1m": Default of 60 minutes, maximum of 1440 minutes

• models: optional array of string

  Restrict usage returned to the specified model(s).

• page: optional string

  Optionally set to the next_page token from the previous response.

• service_account_ids: optional array of string

  Restrict usage returned to the specified service account ID(s).

• service_tiers: optional array of "standard" or "batch" or "priority" or 3 more

  Restrict usage returned to the specified service tier(s).

  • "standard"

  • "batch"

  • "priority"

  • "priority_on_demand"

  • "flex"

  • "flex_discount"

• speeds: optional array of "standard" or "fast"

  Restrict usage returned to the specified speed(s) (Claude Code research preview). Requires the fast-mode-2026-02-01 beta header.

  • "standard"

  • "fast"

• workspace_ids: optional array of string

  Restrict usage returned to the specified workspace ID(s).

Header Parameters

• "anthropic-beta": optional array of string

  Optional header to specify the beta version(s) you want to use.

  To use multiple betas, use a comma separated list like beta1,beta2 or specify the header multiple times for each beta.

Returns

• MessagesUsageReport object { data, has_more, next_page }

  • data: array of object { ending_at, results, starting_at }

    • ending_at: string

      End of the time bucket (exclusive) in RFC 3339 format.

    • results: array of object { account_id, api_key_id, cache_creation, 10 more }

      List of usage items for this time bucket. There may be multiple items if one or more group_by[] parameters are specified.

      • account_id: string

        ID of the user account that made the request. null if not grouping by account or for non-OAuth requests.

      • api_key_id: string

        ID of the API key used. null if not grouping by API key or for usage in the Anthropic Console.

      • cache_creation: object { ephemeral_1h_input_tokens, ephemeral_5m_input_tokens }

        The number of input tokens for cache creation.

        • ephemeral_1h_input_tokens: number

          The number of input tokens used to create the 1 hour cache entry.

        • ephemeral_5m_input_tokens: number

          The number of input tokens used to create the 5 minute cache entry.

      • cache_read_input_tokens: number

        The number of input tokens read from the cache.

      • context_window: "0-200k" or "200k-1M"

        Context window used. null if not grouping by context window.

        • "0-200k"

        • "200k-1M"

      • inference_geo: string

        Inference geo used matching requests' inference_geo parameter if set, otherwise the workspace's default_inference_geo. For models that do not support specifying inference_geo the value is "not_available". Always null if not grouping by inference geo.

      • model: string

        Model used. null if not grouping by model.

      • output_tokens: number

        The number of output tokens generated.

      • server_tool_use: object { web_search_requests }

        Server-side tool usage metrics.

        • web_search_requests: number

          The number of web search requests made.

      • service_account_id: string

        ID of the service account that made the request. null if not grouping by service account or for non-OIDC-federation requests.

      • service_tier: "standard" or "batch" or "priority" or 3 more

        Service tier used. null if not grouping by service tier.

        • "standard"

        • "batch"

        • "priority"

        • "priority_on_demand"

        • "flex"

        • "flex_discount"

      • uncached_input_tokens: number

        The number of uncached input tokens processed.

      • workspace_id: string

        ID of the Workspace used. null if not grouping by workspace or for the default workspace.

    • starting_at: string

      Start of the time bucket (inclusive) in RFC 3339 format.

  • has_more: boolean

    Indicates if there are more results.

  • next_page: string

    Token to provide in as page in the subsequent request to retrieve the next page of data.

Example

curl https://api.anthropic.com/v1/organizations/usage_report/messages \
    -H 'anthropic-version: 2023-06-01' \
    -H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"

Response

{
  "data": [
    {
      "ending_at": "2025-08-02T00:00:00Z",
      "results": [
        {
          "account_id": "user_01WCz1FkmYMm4gnmykNKUu3Q",
          "api_key_id": "apikey_01Rj2N8SVvo6BePZj99NhmiT",
          "cache_creation": {
            "ephemeral_1h_input_tokens": 1000,
            "ephemeral_5m_input_tokens": 500
          },
          "cache_read_input_tokens": 200,
          "context_window": "0-200k",
          "inference_geo": "global",
          "model": "claude-opus-4-6",
          "output_tokens": 500,
          "server_tool_use": {
            "web_search_requests": 10
          },
          "service_account_id": "svac_01Hk3R9TWxq7CfQak00OiVw4",
          "service_tier": "standard",
          "uncached_input_tokens": 1500,
          "workspace_id": "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ"
        }
      ],
      "starting_at": "2025-08-01T00:00:00Z"
    }
  ],
  "has_more": true,
  "next_page": "2019-12-27T18:11:19.117Z"
}