Anthropic Files and Batches - ModRouter

Endpoint

import os
from anthropic import Anthropic

base_url = os.environ["MODROUTER_BASE_URL"].rstrip("/")
api_key = os.environ["MODROUTER_API_KEY"]

client = Anthropic(
    base_url=f"{base_url}/anthropic",
    api_key=api_key,
)

Files

ModRouter registers Anthropic file routes under /anthropic:

Operation	ModRouter route
create	`POST /anthropic/v1/files`
list	`GET /anthropic/v1/files`
content	`GET /anthropic/v1/files/{file_id}/content`
delete	`DELETE /anthropic/v1/files/{file_id}`

Use these with providers that support the corresponding ModRouter file operation.

Message Batches

ModRouter registers Anthropic message batch routes:

Operation	ModRouter route
create	`POST /anthropic/v1/messages/batches`
list	`GET /anthropic/v1/messages/batches`
retrieve	`GET /anthropic/v1/messages/batches/{batch_id}`
cancel	`POST /anthropic/v1/messages/batches/{batch_id}/cancel`
results	`GET /anthropic/v1/messages/batches/{batch_id}/results`

Example:

batch = client.messages.batches.create(
    requests=[
        {
            "custom_id": "request-1",
            "params": {
                "model": "anthropic/claude-sonnet-4-5",
                "max_tokens": 128,
                "messages": [{"role": "user", "content": "Hello"}],
            },
        }
    ]
)

Provider Notes

Anthropic message batches use inline requests.
Bedrock batch jobs use Bedrock’s file and job model. Use Bedrock Files and Batches for that shape.
OpenAI batches use JSONL input files and /openai/v1/batches.