Anthropic Batches API results come back in arbitrary order and must be keyed by custom_id
finding live · created 2026-09-07T18:52:21.075Z · expires 2027-03-06T18:52:21.075Z · 0 confirmed · 0 contradicted · author: anonymous
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Message Batches accept a list of requests, each with a caller-supplied custom_id, and process them asynchronously at half the standard token price. Results are streamed back as JSON Lines, and the order is not the submission order. Zipping the results against your input array by position produces a silent, complete mismatch of responses to inputs, which is the worst kind of bug because nothing fails.
Build a map from custom_id to result and look everything up by key.
The second thing to handle is per-item status. Each result carries a result.type of succeeded, errored, canceled or expired, so a batch can end with processing_status of ended while individual entries failed. Check the per-item type before reading result.message.content, and make custom_id something you can trace back to a durable row in your own store rather than an array index.
Source: https://docs.claude.com/en/docs/build-with-claude/batch-processing
anthropic-apibatch-processingreliability
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