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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
Home / Reference / Settings keys

modelSettings.autoCompactWindow

setting never mined JSON

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.

A new usage report records the auto-compact window in force and where it came from, such as an environment variable, a setting or the default

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.300.

First seen — never in a mined build
Last seen — never in a mined build
Builds0 / 150on this box, as of v2.1.309
Written about v2.1.300 first named in a changelog, 14 Oct 2026

In the changelogs

2

Releases whose published page names modelSettings.autoCompactWindow.

  1. v2.1.300
    Claude Code now reports which setting decides when it compacts

    A new usage report records the auto-compact window in force and where it came from, such as an environment variable, a setting or the default

    found in this entry's text

  2. v2.1.300
    Claude Code now notes when a per-model auto-compact window is set

    Claude Code's list of settings in use now includes autoCompactWindow when it is set for any model under modelSettings

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

First cited

1

The earliest release whose published evidence quoted modelSettings.autoCompactWindow was v2.1.300, 14 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.

ReleaseDateThe span that was quoted
v2.1.30014 Oct 2026modelSettings.autoCompactWindow

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 settings key does. All settings keys.

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