Companion

high — the level the API applies when no effort is requested.

low — the shortest reasoning pass: fastest and cheapest of the three budgets.

max — the longest reasoning pass; slowest, and bills the most reasoning tokens.

medium — accepted everywhere, folded onto HIGH by the server.

minimal — Responses API only; the server folds it onto LOW.

none — no reasoning pass at all. Responses API only; it is that API's way of spelling ThinkingType.DISABLED.

xhigh — accepted everywhere, folded onto HIGH by the server.