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Anthropic adds 'thinking disabled' flag to API model listings

Anthropic’s API now shows whether a model has thinking turned off via a new capabilities flag.

NoteBy Published by Oossa: 1 min read

Event date:

Anthropic updated its API on October 5, 2026. The Models API now includes a new field called capabilities.thinking.types.disabled. When you call GET /v1/models or GET /v1/models/{model_id}, the response tells you if a model has thinking turned off (type: "disabled"). This lets developers see at a glance which models can use the thinking feature.

Why it matters

Developers can now programmatically avoid models that have thinking disabled, preventing unexpected behavior in applications.

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