opus
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.
Opus 5 is now the default Opus, with a 1M-context option in the model picker.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.219.
In the changelogs
11Releases whose published page names opus.
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v2.1.307
Plugin refresh,
/subtaskand a newwritersettingPlugin refresh now marks fresh loads,
/subtaskwas reorganised, and settings gain awriterentry withfableandopusvaluesfound in this entry's text
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v2.1.284
Model aliases like opus now pick the first matching model in a configured list
With a configured model list, opus, sonnet and haiku now map to the first model of that family in the list, not the canonical claude- ID
found in this entry's text, named in this entry
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v2.1.282
Model picker now names the current Opus model instead of a fixed version
The Opus entries in the model picker now take their name from whatever model
opuscurrently points to, rather than always saying Opus 5.5found in this entry's text
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v2.1.219
Opus 5 replaces Opus 4.8 as the default Opus model
Opus 5 is now the default Opus, with a 1M-context option in the model picker.
named in this entry, found in this entry's text
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v2.1.219
The API skill's model placeholders now resolve to Claude Opus 5, with the previous Opus kept as a separate placeholder
The API skill's model placeholders now render Opus 5, keeping the previous Opus named separately.
found in this entry's text
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v2.1.219
Model picker drops the "Requires usage credits" suffix and the manual 1M relabel
The model picker now shows labels straight from the model data, without extra credit or context suffixes.
found in this entry's text
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v2.1.196
Model Alias Resolution
found in this entry's text
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v2.1.196
Fast Mode Model Scope Narrowed
found in this entry's text
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v2.1.195
Model Catalog: New and Updated Models
found in this entry's text
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v2.1.67
Automatic Legacy Opus Model String Migration
found in this entry's text
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v2.1.30
Enhanced Custom Subagent Schema
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.