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Anthropic

Anthropic Message Batches API

Send a batch of Message creation requests at 50% off both input and output tokens. Batches can take up to 24 hours to complete. Supports up to 300k output tokens per request on Opus 4.6/4.7 and Sonnet 4.6 with the output-300k-2026-03-24 beta header.

Documentation Provider Profile APIs.io OpenAPI GitHub

Anthropic Message Batches API is one of 24 APIs that Anthropic publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include AI, Artificial Intelligence, Batches, and Messages. The published artifact set on APIs.io includes API documentation and an OpenAPI specification.

This API exposes 6 operations across 4 paths, and defines 12 schemas. It is described by OpenAPI 3.1.0, at version 1.0.0.

Requests are made against a single base URL, https://api.anthropic.com/v1.

6 operations 4 paths 12 schemas 1 DELETE3 GET2 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
1.0.0
Server
https://api.anthropic.com/v1
Authentication
API Key
Contact
Anthropic
License
Anthropic API License
Resource Areas
1

Authentication & Security 1

Anthropic Message Batches API declares 1 security scheme for authenticating requests. An API key is passed in the header as x-api-key (AdminApiKeyAuth). By default, every request must be authenticated.

  • AdminApiKeyAuth — Your Admin API key for authentication (starts with sk-ant-admin...).

Paths & Operations 6

Across 4 paths, the API surfaces 6 operations — 1 DELETE, 3 GET, 2 POST. Each is listed below with its method, path, parameters, and response codes.

Message Batches 6

Create, manage, and retrieve batch message processing jobs

GET
/messages/batches
Anthropic List Message Batches
listMessageBatches 5 params → 2004XX
POST
/messages/batches
Anthropic Create Message Batch
createMessageBatch 2 params body → 2004XX
GET
/messages/batches/{message_batch_id}
Anthropic Retrieve Message Batch
retrieveMessageBatch 3 params → 2004XX
DELETE
/messages/batches/{message_batch_id}
Anthropic Delete Message Batch
deleteMessageBatch 3 params → 2004XX
GET
/messages/batches/{message_batch_id}/results
Anthropic Retrieve Message Batch Results
retrieveMessageBatchResults 3 params → 2004XX
POST
/messages/batches/{message_batch_id}/cancel
Anthropic Cancel Message Batch
cancelMessageBatch 3 params → 2004XX

Schemas 12

The contract defines 12 schemas that model the data the API accepts and returns. The most detailed are MessageBatch (10 properties), RequestCounts (5 properties), MessageBatchList (4 properties), MessageParams (3 properties). Each schema is shown below with its type and property counts.

Message
object
2 properties 2 required
MessageBatchDeletedResponse
object
2 properties 2 required
MessageParams
object
Parameters for the individual Message creation request
3 properties 3 required
Role
string
The role of the message sender
RequestCounts
object
Tallies of requests categorized by their status
5 properties 5 required
MessageBatchList
object
4 properties 4 required
CreateMessageBatchRequest
object
1 property 1 required
MessageBatchResultsStream
string
JSONL formatted stream with one result object per line
MessageBatch
object
10 properties 10 required
ProcessingStatus
string
Current processing status of the Message Batch
MessageBatchIndividualRequest
object
2 properties 2 required
Error
object
2 properties 2 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

anthropic-message-batches-api-openapi.yml Raw ↑

Other APIs Anthropic publishes across the network.

Anthropic Messages API
AE Profile APIs.io
Anthropic Models API
AE Profile APIs.io
Anthropic Files API
AE Profile APIs.io
Anthropic Token Counting API
AE Profile APIs.io
Anthropic Skills API
AE Profile APIs.io
Anthropic Claude Code Analytics API
AE Profile APIs.io
Anthropic Agents API
AE Profile APIs.io
Anthropic Api Keys API
AE Profile APIs.io
Anthropic Cost API
AE Profile APIs.io
Anthropic Environments API
AE Profile APIs.io
Anthropic Events API
AE Profile APIs.io
Anthropic Organization API
AE Profile APIs.io
#AI#Artificial Intelligence#Batches#Messages
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API Details
ID
anthropic:anthropic-message-batches-api
Server
https://api.anthropic.com/v1
Docs
https://docs.anthropic.com/en/api/creating-message-batches
Provider
Anthropic
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