What changed: capabilities.thinking.types.disabled was added to the Models API; GET /v1/models and GET /v1/models/{model_id} now report whether each model accepts thinking: {type: "disabled"}, which turns thinking off.
Who is affected
Source does not specify.
What it means for your business
For businesses using the Claude API, this means they can now query the Models API to confirm whether thinking can be disabled for a given model.
What to do
If your Claude API integration automates model selection, check the capabilities.thinking.types.disabled field in GET /v1/models responses to confirm which models allow thinking to be turned off.
When it takes effect
Effective as of the October 5, 2026 announcement date.
Source: https://platform.claude.com/docs/en/release-notes/overview#october-5-2026
