thinking changedbuild-with-claude/thinking
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471471Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, Claude Mythos 5, Claude Opus 5.5, and Claude Mythos Preview reject `thinking: {type: "disabled"}`. Thinking can't be turned off on these models.
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473To check whether a model accepts `"disabled"` before you send a request, read its `capabilities.thinking.types.disabled.supported` value from the Models API. [Using the Models API](https://platform.claude.com/docs/en/models/overview#using-the-models-api) describes the field.
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473475If your model supports only extended thinking (see the [per-model configuration table](https://platform.claude.com/docs/en/build-with-claude/thinking-troubleshooting#supported-models)), configure it with `type: "enabled"` and a `budget_tokens` value instead. The [Extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) page covers that configuration. And if any thinking configuration comes back with a 400 error, [Troubleshooting thinking](https://platform.claude.com/docs/en/build-with-claude/thinking-troubleshooting) matches each error message to its fix.
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475477## Reading thinking output
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