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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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claude-haiku-4-5

model never mined JSON

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.

The compiled-in seed catalog used before the first fetch lists claude-opus-5, claude-sonnet-5 and claude-haiku-4-5.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.257.

First seen — never in a mined build
Last seen — never in a mined build
Builds0 / 149on this box, as of v2.1.308
Written about v2.0.17 first named in a changelog, 15 Oct 2025

In the changelogs

10

Releases whose published page names claude-haiku-4-5.

  1. v2.1.293
    Claude Code now knows about a Haiku 5.5 model

    Claude Code now recognises claude-haiku-5-5, with a 1M-token context window, its own pricing and a fallback to claude-haiku-4-5

    found in this entry's text

  2. v2.1.293
    The haiku model name now means Haiku 5.5 on the Anthropic API

    The haiku alias now picks claude-haiku-5-5 on Anthropic's own API, while Bedrock, Vertex and other providers stay on claude-haiku-4-5

    found in this entry's text

  3. v2.1.293
    The Haiku model name now points to Claude Haiku 5.5

    Claude Code now names Haiku as Claude Haiku 5.5 (claude-haiku-5-5) instead of Haiku 4.5, and prices it with its own rate

    found in this entry's text

  4. v2.1.283
    Gateway settings require a models list for a Bedrock Mantle upstream

    A gateway upstream of the mantle (AWS Bedrock Mantle) type now needs a models list, and only those models are sent to it

    found in this entry's text

  5. v2.1.269
    New model-name whitelist helper recognizes Opus 4.5 and Haiku 4.5

    Model-name whitelist helper now recognizes claude-opus-4-5 and claude-haiku-4-5 as current model names

    found in this entry's text, named in this entry

  6. v2.1.257
    Compiled seed catalog includes Opus 5 / Sonnet 5 placeholders

    The compiled-in seed catalog used before the first fetch lists claude-opus-5, claude-sonnet-5 and claude-haiku-4-5.

    found in this entry's text, named in this entry

  7. v2.1.201
  8. v2.1.174
    Advisor Model Capability Enforcement

    found in this entry's text

  9. v2.1.126
  10. v2.0.17
    Haiku 4.5 Model Support

    found in this entry's text

First cited

2

The earliest release whose published evidence quoted claude-haiku-4-5 was v2.1.174, 11 Jun 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.

ReleaseDateThe span that was quoted
v2.1.17411 Jun 2026claude-haiku-4-5
v2.1.28325 Sep 2026a mantle upstream needs a models list: the models your AWS account has on Mantle, named as clients send them, for example models: [claude-opus-4-7, claude-haiku-4-5]. Only these go to this upstream.

Presence across releases

0

The 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.

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