Under the hood
Choosing ultracode effort now unpins the launch-effort lock or hard-stops, changing when the pin-blocked message appears.
Setting effort to "ultracode" now calls a helper that either unpins the launch-effort lock or triggers a hard-stop before applying the effort change. The launch-effort pin block is now only checked when a new condition holds, which changes when the pin-blocked message (effort locked this session, ultracode needs xhigh) is shown.
Names in the bundleultracodexhigh
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 since
Anthropic's documentation has since written up ultracode, on Model configuration.
<span id="when-ultracode-is-available" />model-config see the edit
Confirmed since
Anthropic's documentation has since written up xhigh, on Model configuration.
* The model doesn't support `xhigh` effortmodel-config see the edit
Added since
A small documentation edit on Agent SDK reference - TypeScript touched a line naming ultracode after this was published.
`effortLevel` accepts an [effort level](/docs/en/model-config#adjust-effort-level) name. It also accepts `"ultracode"`, which requests `xhigh` effort with [ultracode](/docs/en/workflows#let-claude-decide-with-ultracode) on. `applyFlagSetti…agent-sdk/typescript see the edit
Added since
A small documentation edit on Agent SDK reference - TypeScript touched a line naming xhigh after this was published.
`effortLevel` accepts an [effort level](/docs/en/model-config#adjust-effort-level) name. It also accepts `"ultracode"`, which requests `xhigh` effort with [ultracode](/docs/en/workflows#let-claude-decide-with-ultracode) on. `applyFlagSetti…agent-sdk/typescript see the edit
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agrees
A small documentation edit on Agent SDK reference - TypeScript touched a line naming xhigh after this was published.