haiku
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.
Rate-limit prompts now resolve model aliases, so you get fewer misdirected limit warnings.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.234.
In the changelogs
8Releases whose published page names haiku.
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v2.1.323
The
fablealias now points to claude-fable-5-2 by defaultChoosing the
fablealias on the default provider now gives you claude-fable-5-2 instead of claude-fable-5-1found in this entry's text
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v2.1.310
Default models for sonnet, opus and haiku can be set by Anthropic
The model the sonnet, opus and haiku aliases pick by default can now come from a document Anthropic sends, while environment variables still win
found in this entry's text, named in this entry
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v2.1.293
The
haikumodel name now means Haiku 5.5 on the Anthropic APIThe
haikualias now picksclaude-haiku-5-5on Anthropic's own API, while Bedrock, Vertex and other providers stay onclaude-haiku-4-5found in this entry's text, named in this entry
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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
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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
named in this entry, found in this entry's text
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v2.1.234
Rate-limit prompts resolve model aliases to the model that actually answers
Rate-limit prompts now resolve model aliases, so you get fewer misdirected limit warnings.
found in this entry's text
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v2.1.166
fallbackModelsetting in settings.jsonfound 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.