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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Developer Platform 22 Oct 2026
One change · api

Message Batches API changedbuild-with-claude/batch-processing

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From line 421 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits22to this page, all time

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421421 
422422When a batch is first created, the response has a processing status of `in_progress`.
423423 
424```json Output
424```text Output wrap
425425{
426426 "id": "msgbatch_01HkcTjaV5uDC8jWR4ZsDV8d",
427427 "type": "message_batch",
from line 917
917917 
918918The results are in `.jsonl` format, where each line is a valid JSON object representing the result of a single request in the Message Batch. For each streamed result, you can do something different depending on its `custom_id` and result type. Here is an example set of results:
919919 
920```jsonl .jsonl file
920```text .jsonl file
921921{"custom_id":"my-second-request","result":{"type":"succeeded","message":{"id":"msg_014VwiXbi91y3JMjcpyGBHX5","type":"message","role":"assistant","model":"claude-opus-5-5","content":[{"type":"text","text":"Hello again! It's nice to see you. How can I assist you today? Is there anything specific you'd like to chat about or any questions you have?"}],"stop_reason":"end_turn","stop_sequence":null,"usage":{"input_tokens":11,"output_tokens":36}}}}
922922{"custom_id":"my-first-request","result":{"type":"succeeded","message":{"id":"msg_01FqfsLoHwgeFbguDgpz48m7","type":"message","role":"assistant","model":"claude-opus-5-5","content":[{"type":"text","text":"Hello! How can I assist you today? Feel free to ask me any questions or let me know if there's anything you'd like to chat about."}],"stop_reason":"end_turn","stop_sequence":null,"usage":{"input_tokens":10,"output_tokens":34}}}}
923923```
from line 1016
10161016 
10171017The response shows the batch in a `canceling` state:
10181018 
1019```json Output
1019```text Output wrap
10201020{
10211021 "id": "msgbatch_013Zva2CMHLNnXjNJJKqJ2EF",
10221022 "type": "message_batch",
from line 1837
18371837 </Accordion>
18381838 
18391839 <Accordion title="Can I update a batch after it's been submitted?">
1840 No, once a batch has been submitted, it cannot be modified. If you need to make changes, you should cancel the current batch and submit a new one. Note that cancellation might not take immediate effect.
1840 No, once a batch has been submitted, it cannot be modified. If you need to make changes, cancel the current batch and submit a new one. Note that cancellation might not take immediate effect.
18411841 </Accordion>
18421842 
18431843 <Accordion title="Are there Message Batches API rate limits and do they interact with the Messages API rate limits?">
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