Message Batches API changedbuild-with-claude/batch-processing
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7171| -------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
7272| `stream: true` | Batch results come back as a single file, not a stream. |
7373| `speed` ([Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode)) | Fast mode tunes synchronous latency, which doesn't apply to asynchronous batch processing. |
74| `store` / `previous_thread_event_id` (Threads) | Threads are stateful; batch requests are not. |
75| `cache_hint` / `context_hint` | These routing hints apply to synchronous request scheduling only. |
7674| `max_tokens: 0` | See [Batch limitations](https://platform.claude.com/docs/en/build-with-claude/batch-processing#batch-limitations). |
77| `research_preview_2026_02: "active"` | Research preview mode is not available on the batch path. |
7875
7976<Tip>
8077 Because batches can take longer than 5 minutes to process, consider using the [1-hour cache duration](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#1-hour-cache-duration) with prompt caching for better cache hit rates when processing batches with shared context.
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18431840 </Accordion>
18441841
18451842 <Accordion title="Can I use the Message Batches API with other API features?">
1846 Yes, the Message Batches API supports nearly all features available in the Messages API, including most beta features. A small number of parameters (`stream`, `speed`, `store`, `previous_thread_event_id`, `cache_hint`, `context_hint`, `max_tokens: 0`, and `research_preview_2026_02`) are not supported. See [What can be batched](https://platform.claude.com/docs/en/build-with-claude/batch-processing#what-can-be-batched) for the full list.
1843 Yes, the Message Batches API supports nearly all features available in the Messages API, including most beta features. A small number of parameters (`stream`, `speed`, and `max_tokens: 0`) are not supported. See [What can be batched](https://platform.claude.com/docs/en/build-with-claude/batch-processing#what-can-be-batched) for the full list.
18471844 </Accordion>
18481845
18491846 <Accordion title="How does the Message Batches API affect pricing?">
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