---
title: "Create batch"
method: POST
path: "/batches"
tags: ["Batch"]
---

# Create batch

`POST /batches`

Creates and executes a batch from an uploaded file of requests

## Request body

- CreateBatchRequest
  - `input_file_id` string, required — The ID of an uploaded file that contains requests for the new batch. See [upload file](https://platform.openai.com/docs/api-reference/files/create) for how to upload a file. Your input file must be formatted as a [JSONL file](https://platform.openai.com/docs/api-reference/batch/request-input), and must be uploaded with the purpose `batch`. The file can contain up to 50,000 requests, and can be up to 200 MB in size.
  - `endpoint` '/v1/responses' | '/v1/chat/completions' | '/v1/embeddings' | '/v1/completions' | '/v1/moderations' | '/v1/images/generations' | '/v1/images/edits' | '/v1/videos', required — The endpoint to be used for all requests in the batch. Currently `/v1/responses`, `/v1/chat/completions`, `/v1/embeddings`, `/v1/completions`, `/v1/moderations`, `/v1/images/generations`, `/v1/images/edits`, and `/v1/videos` are supported. Note that `/v1/embeddings` batches are also restricted to a maximum of 50,000 embedding inputs across all requests in the batch.
  - `completion_window` '24h', required — The time frame within which the batch should be processed. Currently only `24h` is supported.
  - `metadata` Metadata, nullable — Set of 16 key-value pairs that can be attached to an object. This can be useful for storing additional information about the object in a structured format, and querying for objects via API or the dashboard. Keys are strings with a maximum length of 64 characters. Values are strings with a maximum length of 512 characters.
  - `output_expires_after` BatchFileExpirationAfter — The expiration policy for the output and/or error file that are generated for a batch.
    - `anchor` 'created_at', required — Anchor timestamp after which the expiration policy applies. Supported anchors: `created_at`. Note that the anchor is the file creation time, not the time the batch is created.
    - `seconds` integer, required — The number of seconds after the anchor time that the file will expire. Must be between 3600 (1 hour) and 2592000 (30 days).

## Response `200`

Batch created successfully.

- Batch
  - `id` string, required
  - `object` 'batch', required — The object type, which is always `batch`.
  - `endpoint` string, required — The OpenAI API endpoint used by the batch.
  - `model` string — Model ID used to process the batch, like `gpt-5-2025-08-07`. OpenAI offers a wide range of models with different capabilities, performance characteristics, and price points. Refer to the [model guide](https://platform.openai.com/docs/models) to browse and compare available models.
  - `errors` object
    - `object` string — The object type, which is always `list`.
    - `data` BatchError[]
      - `code` string — An error code identifying the error type.
      - `message` string — A human-readable message providing more details about the error.
      - `param` string, nullable — The name of the parameter that caused the error, if applicable.
      - `line` integer, nullable — The line number of the input file where the error occurred, if applicable.
  - `input_file_id` string, required — The ID of the input file for the batch.
  - `completion_window` string, required — The time frame within which the batch should be processed.
  - `status` 'validating' | 'failed' | 'in_progress' | 'finalizing' | 'completed' | 'expired' | 'cancelling' | 'cancelled', required — The current status of the batch.
  - `output_file_id` string — The ID of the file containing the outputs of successfully executed requests.
  - `error_file_id` string — The ID of the file containing the outputs of requests with errors.
  - `created_at` integer, required — The Unix timestamp (in seconds) for when the batch was created.
  - `in_progress_at` integer — The Unix timestamp (in seconds) for when the batch started processing.
  - `expires_at` integer — The Unix timestamp (in seconds) for when the batch will expire.
  - `finalizing_at` integer — The Unix timestamp (in seconds) for when the batch started finalizing.
  - `completed_at` integer — The Unix timestamp (in seconds) for when the batch was completed.
  - `failed_at` integer — The Unix timestamp (in seconds) for when the batch failed.
  - `expired_at` integer — The Unix timestamp (in seconds) for when the batch expired.
  - `cancelling_at` integer — The Unix timestamp (in seconds) for when the batch started cancelling.
  - `cancelled_at` integer — The Unix timestamp (in seconds) for when the batch was cancelled.
  - `request_counts` BatchRequestCounts — The request counts for different statuses within the batch.
    - `total` integer, required — Total number of requests in the batch.
    - `completed` integer, required — Number of requests that have been completed successfully.
    - `failed` integer, required — Number of requests that have failed.
  - `usage` object — Represents token usage details including input tokens, output tokens, a breakdown of output tokens, and the total tokens used. Only populated on batches created after September 7, 2025.
    - `input_tokens` integer, required — The number of input tokens.
    - `input_tokens_details` object, required — A detailed breakdown of the input tokens.
      - `cached_tokens` integer, required — The number of tokens that were retrieved from the cache. [More on prompt caching](https://platform.openai.com/docs/guides/prompt-caching).
    - `output_tokens` integer, required — The number of output tokens.
    - `output_tokens_details` object, required — A detailed breakdown of the output tokens.
      - `reasoning_tokens` integer, required — The number of reasoning tokens.
    - `total_tokens` integer, required — The total number of tokens used.
  - `metadata` Metadata, nullable — Set of 16 key-value pairs that can be attached to an object. This can be useful for storing additional information about the object in a structured format, and querying for objects via API or the dashboard. Keys are strings with a maximum length of 64 characters. Values are strings with a maximum length of 512 characters.

---

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