Create a Message Batch changedapi/beta/messages/batches/create
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Lines+27added
Lines−1removed
From line
129
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First seen
14 Aug 2026
this site's first read of the page
Recorded edits26to this page, all time
The whole hunk
from line 129, old and new numbered
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from line 129
129129
130130 - `"telemetry-destinations-2026-08-11"`
131131
132 - `"webhooks-2026-10-07"`
133
132134- `"anthropic-user-profile-id": optional string`
133135
134136 The user profile ID to attribute the requests in this batch to. Use when acting on behalf of a party other than your organization. Applies to every request in the batch; an individual request whose `user_profile_id` body field conflicts with this header is errored.
from line 3796
37943796
37953797 - `max_tokens: optional number or null`
37963798
3799 The `max_tokens` for the fallback attempt that uses this `fallbacks` entry's `model`, in place of the request's `max_tokens`. If you leave it out or set it to `null`, the attempt uses the request's `max_tokens`.
3800
3801 See the [refusals and fallback guide](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback?sdk_languages=http#naming-your-own-fallback-models) to learn more about fallback entries.
3802
37973803 - `output_config: optional BetaOutputConfig or null`
37983804
3805 Output parameters for the fallback attempt that uses this `fallbacks` entry's `model`, combined with the request's `output_config` one field at a time.
3806
3807 - `format`: If you leave it out, the attempt uses the request's `format`. If you set it to `null`, the attempt runs without a format.
3808 - `effort`: If you leave it out, the attempt uses the request's `effort` when `model` supports that level with the attempt's `thinking`. If the request doesn't set `effort`, if `model` doesn't support the level, or if you set `effort` to `null`, the attempt runs at the default effort of `model`.
3809 - `task_budget`: If you leave it out, the attempt uses the request's `task_budget` when `model` accepts a task budget of that size. If the request doesn't set `task_budget`, if `model` doesn't accept it, or if you set `task_budget` to `null`, the attempt runs without a task budget.
3810
3811 Set `output_config` to `null` to run the attempt without a format or a task budget, at the default effort of `model`.
3812
3813 These rules apply with the `server-side-fallback-2026-07-01` beta header.
3814
37993815 - `effort: optional "low" or "medium" or "high" or 2 more or null`
38003816
38013817 How much effort the model should put into its response. Higher effort levels may result in more thorough analysis but take longer.
from line 3860
38443860
38453861 - `speed: optional "standard" or "fast" or null`
38463862
3847 Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time.
3863 The inference speed mode for the fallback attempt that uses this `fallbacks` entry's `model`. If you leave it out, the attempt runs at `fast` speed only when the request sets `speed` to `fast` and your organization can use fast mode on `model`.
38483864
3865 Otherwise, or when you set this field to `null`, the attempt runs at `standard` speed.
3866
3867 These rules apply with the `server-side-fallback-2026-07-01` beta header.
3868
38493869 - `"standard"`
38503870
38513871 - `"fast"`
38523872
38533873 - `thinking: optional BetaThinkingConfigEnabled or BetaThinkingConfigDisabled or BetaThinkingConfigBetweenTools or BetaThinkingConfigAdaptive or null`
3874
3875 The thinking configuration for the fallback attempt that uses this `fallbacks` entry's `model`. If you leave it out, the attempt uses the request's `thinking` when `model` supports that thinking `type`.
3876
3877 If you leave it out and the request's thinking `type` is `between_tools` but `model` doesn't support `between_tools`, the attempt uses `disabled` if `model` supports it. Otherwise, if `model` doesn't support the request's thinking `type`, if the request doesn't set `thinking`, or if you set this field to `null`, the attempt uses the thinking `type` that `model` uses when a request leaves out `thinking`. The request's `thinking.display` still applies where `model` allows it.
3878
3879 These rules apply with the `server-side-fallback-2026-07-01` beta header.
38543880
38553881 - `BetaThinkingConfigEnabled object`
38563882
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