Model configuration changedmodel-config
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520520* **`/effort`**: run `/effort ultracode`, or select it from the menu
521521* **`--effort` flag**: launch with `claude --effort ultracode`, which starts the session at `xhigh` effort with ultracode on
522522* **`ultracode` setting**: set [`"ultracode": true`](/docs/en/settings-reference#ultracode) in a settings file, with `--settings`, or in an Agent SDK control request. An [`applyFlagSettings()`](/docs/en/agent-sdk/typescript#applyflagsettings) request also accepts `effortLevel: "ultracode"`
523* **`/model` picker**: move the effort slider to `ultracode` with the arrow keys while you choose a model. Claude Code turns it on for the current session, even when you save that model as your default
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524525Passing `ultracode` to the `--effort` flag or the Agent SDK `effortLevel` value requires Claude Code v2.1.203 or later. Before v2.1.203, `--effort ultracode` printed `Unknown --effort value 'ultracode'` and the session started at the default effort.
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