ultrathinkAvailable
A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Session information sent to host apps now includes ultrathinkAvailable, saying whether typing ultrathink runs the turn at xhigh effort
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.315.
In the changelogs
2Releases whose published page names ultrathinkAvailable.
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v2.1.315
Editor extensions can now tell when
ultrathinkwill raise reasoning effortSession information sent to host apps now includes
ultrathinkAvailable, saying whether typingultrathinkruns the turn at xhigh effortnamed in this entry, found in this entry's text
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v2.1.315
Settings survive brief read failures, and SDK apps can see if ultrathink is available
A settings file that briefly fails to read now keeps its last-read values, and
get_settingsnow reports whether ultrathink is availablefound in this entry's text
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.