claude-haiku-4-5-20251001
A Claude Code model, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
In the built-in model list, Opus 5 moves to the overflow section and loses its quick-select flag and description
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.282.
In the changelogs
4Releases whose published page names claude-haiku-4-5-20251001.
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v2.1.295
Built-in model list updated, adding Haiku 4.5 with extended thinking
The built-in model list moved to a newer version and one list in it now includes Haiku 4.5 set to extended thinking
found in this entry's text, named in this entry
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v2.1.282
Opus 5 moved to the overflow section of the built-in model list
In the built-in model list, Opus 5 moves to the overflow section and loses its quick-select flag and description
found in this entry's text
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v2.0.24
Increased Haiku 4.5 Output Capacity
found in this entry's text
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v2.0.17
Haiku 4.5 Model Support
found in this entry's text
First cited
1The earliest release whose published evidence quoted claude-haiku-4-5-20251001 was v2.1.295, 8 Oct 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
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 model does. All models.