What's wrong with this entry?
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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.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.