Under the hood
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The thinking_disabled_effort_cap flag can now override the claude-opus-5 hardcoded default in either direction
What
A helper that decides whether an extra-high reasoning effort cap applies to a model previously required the thinking_disabled_effort_cap flag to be exactly true, or the model to literally be claude-opus-5. Now, any explicit value returned by the flag (true or false) is used first, and the claude-opus-5 hardcoded default only applies when the flag has no value at all.
Why
This mirrors a similar change to another flag in this release, letting the server control this cap explicitly instead of it always being forced on for claude-opus-5.