Unclear What the new condition checks, and so whether ultrathink now behaves differently, is not stated.
What
At the start of each turn, Claude Code runs a check on your prompt. That check now knows whether you typed the keyword ultrathink, and it has a new final condition. Before, an earlier condition had to pass before the check ran at all. That earlier condition has been removed.
Why
This can change when ultrathink takes effect.
Names in the bundleultrathink
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The writer flagged doubt
What the new condition checks, and so whether `ultrathink` now behaves differently, is not stated.