The effort level notification changed from "Effort level set to auto" to "Effort level set to max", providing clearer feedback when effort is maximized. The "ultrathink" keyword now triggers a system prompt explaining that deeper reasoning is being applied.
Evidence
Effort messaging (search for "Effort level set to max")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed /effort auto confirmation — now says "Effort level set to max" to match the status bar label
