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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
Home / Reference / Settings keys

xhigh

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.

The bundled Claude API skill docs now target the new Opus, covering thinking defaults, fallbacks and fast mode.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.219.

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 v2.1.111 first named in a changelog, 16 Apr 2026

In the changelogs

21

Releases whose published page names xhigh.

  1. v2.1.293
    Effort levels are now defined in one shared list

    Claude Code now keeps one shared list of effort levels: low, medium, high, xhigh and max

    found in this entry's text

  2. v2.1.290
    /code-review medium now runs the high-effort recipe on most models

    On every model without its own /code-review row, Opus 5.5 included, medium now runs the eight-angle high recipe instead of a single pass. high, xhigh and Opus 5 are unchanged.

    found in this entry's text

  3. v2.1.284
    /effort no longer starts on ultracode when you open it

    The /effort picker no longer jumps to ultracode as its first selection when ultracode is on

    found in this entry's text

  4. v2.1.284
    Ultracode is now an on/off switch that works with any effort level

    Ultracode is no longer an effort level that forces xhigh; you turn it on or off with /effort ultracode on or off

    found in this entry's text

  5. v2.1.284
    Clearer error when ultracode can't be turned on, and it no longer forces top effort

    When ultracode is unavailable, the error now names one reason, and turning it on no longer forces extra-high effort

    found in this entry's text

  6. v2.1.280
    New "max effort" mode with /effort command

    A new "max effort" mode appears with a footer hint pointing to the /effort command

    found in this entry's text

  7. v2.1.280
    Effort/ultracode settings resolution reworked with legacy fallback

    Effort-level settings resolution reworked so a legacy top-level effort setting now properly backs ultracode mode

    found in this entry's text

  8. v2.1.263
    Effort-medium nudge generalized to multiple models and effort levels

    The effort-downgrade nudge now works per model instead of just one, but each model needs its own flag turned on.

    found in this entry's text

  9. v2.1.257
    New model: Mythos 5.1 added to model registry

    Mythos 5.1 joins the model catalog with a 1M context window and effort levels up to max.

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

  10. v2.1.257
    Model effort levels (xhigh/max/regular) now derived from model metadata rather than a hardcoded model-name check

    Which effort levels a model supports now comes from per-model metadata instead of matching model names.

    named in this entry

  11. v2.1.257
    Ultracode effort now explicitly clears/holds the launch-effort pin

    Choosing ultracode effort now unpins the launch-effort lock or hard-stops, changing when the pin-blocked message appears.

    named in this entry

  12. v2.1.248
    Reasoning effort levels and their aliases

    Reasoning effort accepts low through max, with med and ultracode as aliases.

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

  13. v2.1.239
    New modelSettings config key holds per-model effort

    A new modelSettings config key stores an effort level per model, from low to xhigh.

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

  14. v2.1.238
    Remote bridge sets effort as a session value

    Effort sent from a remote session is now applied as session effort, with ultracode setting it to xhigh.

    found in this entry's text

  15. v2.1.219
    Bundled Claude API skill docs rewritten around Opus 5

    The bundled Claude API skill docs now target the new Opus, covering thinking defaults, fallbacks and fast mode.

    found in this entry's text

  16. v2.1.219
    New "Migrating to {{OPUS_NAME}}" migration guide with two breaking changes

    A migration guide now spells out the two thinking-related changes that break existing API request code.

    found in this entry's text

  17. v2.1.195
    Model Catalog: New and Updated Models

    found in this entry's text

  18. v2.1.170
    xhigh Effort Warning

    found in this entry's text

  19. v2.1.126
  20. v2.1.117
  21. v2.1.111
    New "xhigh" Effort Level

    found in this entry's text

First cited

0

No 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

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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