task-budgets changedbuild-with-claude/task-budgets
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## Availability ### API support #### [Messages API](https://platform.claude.com/docs/en/build-with-claude/working-with-messages) #### [Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview) ### Required beta headers
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1212 - claude-mythos-5
13 - claude-mythos-preview
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1415 - claude-opus-5
15 - claude-opus-4-8
16 - claude-opus-4-7
1716 - claude-sonnet-5-5
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18 - claude-opus-4-8
19 - claude-opus-4-7
20 supportedPlatforms:
21 Claude API: beta
22 Claude Platform on AWS: beta
23 Claude Models on Google Cloud (Google managed): beta
24 Microsoft Foundry: beta
1925---
2026
2127Task budgets let you tell Claude how many tokens it has for a full agentic loop, including thinking, tool calls, tool results, and output. The model receives a running countdown and uses it to prioritize work and finish gracefully as the budget is consumed.
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696702 Reduce cost and latency on repeated prompts by caching prompt prefixes.
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705
706## Availability
707
708Task budgets are in beta on select models.
709
710### API support
711
712#### [Messages API](https://platform.claude.com/docs/en/build-with-claude/working-with-messages)
713
714* Availability: Available
715* Usage: Advisory: set in `output_config.task_budget`. The API does not stop Claude at the budget.
716
717| Status | Cloud platforms | Models |
718| ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
719| Beta | Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), [Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/google-managed), [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry) | [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview), [Claude Mythos 5.1](https://platform.claude.com/docs/en/models/mythos-5-1/overview), [Claude Fable 5](https://platform.claude.com/docs/en/models/fable-5/overview), [Claude Mythos 5](https://platform.claude.com/docs/en/models/mythos-5/overview), Claude Mythos Preview, [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview), [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview), [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview), [Claude Haiku 5.5](https://platform.claude.com/docs/en/models/haiku-5-5/overview), [Claude Opus 4.8](https://platform.claude.com/docs/en/models/opus-4-8/overview), [Claude Opus 4.7](https://platform.claude.com/docs/en/models/opus-4-7/overview) |
720
721#### [Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview)
722
723* Availability: Not available
724* Usage: Use [Session budgets](https://platform.claude.com/docs/en/managed-agents/budgets) instead.
725
726### Required beta headers
727
728[Beta headers overview](https://platform.claude.com/docs/en/api/beta-headers)
729
730Beta headers allow you to access experimental features and new model capabilities before they become part of the standard API.
731
732* `task-budgets-2026-03-13`
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