CLAUDE_CODE_3P_SEEDED_OPUS_DEFAULT
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.285, including the newest one read.
If your cloud account cannot use a model, Claude Code can step down to the next one; CLAUDE_CODE_DISABLE_MODEL_ACCESS_FALLBACK turns this off
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.285.
In the changelogs
2Releases whose published page names CLAUDE_CODE_3P_SEEDED_OPUS_DEFAULT.
-
v2.1.285
Cloud accounts fall back to another model when one is not enabled
If your cloud account cannot use a model, Claude Code can step down to the next one;
CLAUDE_CODE_DISABLE_MODEL_ACCESS_FALLBACKturns this offfound in this entry's text
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v2.1.285
A Haiku model that Claude Code picked for you no longer counts as your choice
On third-party providers, a Haiku model Claude Code set itself is no longer treated as one you set in
ANTHROPIC_DEFAULT_HAIKU_MODELfound 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
1Build by build
1One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
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 environment variable does. All environment variables.