high
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.
The bundled Claude API skill docs now target the new Opus, covering thinking defaults, fallbacks and fast mode.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.219.
In the changelogs
19Releases whose published page names high.
-
v2.1.293
Effort levels are now defined in one shared list
Claude Code now keeps one shared list of effort levels: low, medium, high, xhigh and max
found in this entry's text
-
v2.1.290
/code-review mediumnow runs the high-effort recipe on most modelsOn every model without its own
/code-reviewrow, Opus 5.5 included,mediumnow runs the eight-angle high recipe instead of a single pass.high,xhighand Opus 5 are unchanged.found in this entry's text
-
v2.1.281
Bundled model-preset config: chat preset thinking effort for claude-opus-5-5 set to medium
A bundled model config now lists claude-opus-5-5 at medium thinking effort for the chat preset, alongside claude-opus-5 at high
found in this entry's text
-
v2.1.263
Effort-medium nudge generalized to multiple models and effort levels
The effort-downgrade nudge now works per model instead of just one, but each model needs its own flag turned on.
found in this entry's text
-
v2.1.248
Reasoning effort levels and their aliases
Reasoning effort accepts low through max, with med and ultracode as aliases.
named in this entry, found in this entry's text
-
v2.1.239
New
modelSettingsconfig key holds per-model effortA new modelSettings config key stores an effort level per model, from low to xhigh.
found in this entry's text
-
v2.1.224
Model catalog ships per-effort cost multipliers
Bundled models carry per-effort cost multipliers, though nothing in this build reads them.
found in this entry's text
-
v2.1.223
Remote notifications from the session stream are routed into the local notification queue
Notifications sent from a remote session now actually reach you instead of being silently discarded.
found in this entry's text
-
v2.1.219
Bundled Claude API skill docs rewritten around Opus 5
The bundled Claude API skill docs now target the new Opus, covering thinking defaults, fallbacks and fast mode.
found in this entry's text
-
v2.1.219
New "Migrating to {{OPUS_NAME}}" migration guide with two breaking changes
A migration guide now spells out the two thinking-related changes that break existing API request code.
found in this entry's text
-
v2.1.195
Model Catalog: New and Updated Models
found in this entry's text
-
v2.1.170
Claude Fable 5 Model Support
found in this entry's text
-
v2.1.126
/effortselections are now persisted to user settingsfound in this entry's text
-
v2.1.124
claude installdeprecation bannerfound in this entry's text
-
v2.1.111
New "xhigh" Effort Level
found in this entry's text
-
v2.1.76
/effortSlash Commandfound in this entry's text
-
v2.1.72
Effort Level "max" and Persistence
found in this entry's text
-
v2.1.38
Effort Level Control
found in this entry's text
-
v2.0.44
Experimental Reasoning Effort Control
found 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.