opus5
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 local model listing endpoint now includes Opus 5 among its available keys.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.219.
In the changelogs
3Releases whose published page names opus5.
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v2.1.257
New model alias fable51 added
A fable51 entry joins the internal model alias list used for resolution and allowlisting.
found in this entry's text
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v2.1.219
opus5in the local model listingThe local model listing endpoint now includes Opus 5 among its available keys.
named in this entry, found in this entry's text
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v2.1.219
Opus 5 wired through region env vars, refusal fallbacks and pricing copy
An Opus 5 model is wired through region variables, fast mode, 1M context and pricing text.
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.