What probably matters to youSection of the release
What
The effort line now shows "ultracode" as a level, says when an effort setting applies to the current session only, and warns when CLAUDE_CODE_EFFORT_LEVEL in your environment is overriding the effort you chose, telling you to clear it.
Details
The override clause appears only when that environment variable is set.
Evidence
overrides effort this session; clear it and
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed sinceAnthropic's documentation has since written up CLAUDE_CODE_EFFORT_LEVEL, on All settings.Cap the [effort level](/docs/en/model-config#adjust-effort-level) a session can use, leaving lower levels available. Any higher level runs at the cap instead, including one from `/effort`, the `/model` picker, `--effort`, [`CLAUDE_CODE_EFF…settings-referencesee the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up CLAUDE_CODE_EFFORT_LEVEL, on All settings.
