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HomeDocsClaude Developer Platform 12 Oct 2026
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Retrieve Message Batch results changedapi/messages/batches/results

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1212Each line in the file is a JSON object containing the result of a single request in the Message Batch. Results are not guaranteed to be in the same order as requests. Use the `custom_id` field to match results to requests.
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14Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing)
14Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing?sdk_languages=http)
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1616## Path parameters
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2626 The version of the Claude API you want to use.
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28 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
28 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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3030- `"anthropic-workspace-id": optional string`
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297297 This is an opaque field and should not be interpreted or parsed. When passing thinking blocks back to the API (required when using tools with extended thinking), pass them back exactly as received, with this field intact.
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299 See [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) for details.
299 See [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking?sdk_languages=http) for details.
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301301 - `thinking: string`
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315315 Pass `redacted_thinking` blocks back to the API unchanged when continuing a multi-turn conversation.
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317 See [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking#redacted-thinking-blocks) for details.
317 See [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking?sdk_languages=http#redacted-thinking-blocks) for details.
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319319 - `ToolUseBlock object`
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10171017 - `"reasoning_extraction"`
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1019 The request asks the model to reproduce its internal reasoning in the response text. To get reasoning in a structured form instead, use [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/adaptive-thinking).
1019 The request asks the model to reproduce its internal reasoning in the response text. To get reasoning in a structured form instead, use [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/adaptive-thinking?sdk_languages=http).
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10211021 - `"general_harms"`
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