Create a Message Batch changedapi/messages/batches/create
Nearest release: v2.1.282, published an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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Lines−0removed
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1,217
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14 Aug 2026
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Recorded edits25to this page, all time
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12181218 - `string`
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1220 - `diagnostics: optional DiagnosticsParam or null`
1221
1222 Request-level diagnostics. Currently carries the previous response
1223 id for prompt-cache divergence reporting.
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1225 - `previous_message_id: optional string or null`
1226
1227 The `id` (`msg_...`) from this client's previous /v1/messages response. The server compares that request's prompt fingerprint against this one and returns `diagnostics.cache_miss_reason` when the prompt-cache prefix could not be reused. Pass `null` on the first turn to opt in without a prior message to compare.
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1229 maxLength: 256
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12201231 - `inference_geo: optional string or null`
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12221233 Specifies the geographic region for inference processing. If not specified, the workspace's `default_inference_geo` is used.
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