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claude-sonnet-4-6

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.

Context limits for claude-sonnet-5 are 500,000 on two surfaces and a million elsewhere.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.248.

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 v2.1.51 first named in a changelog, 23 Feb 2026

In the changelogs

20

Releases whose published page names claude-sonnet-4-6.

  1. v2.1.295
    A remote override for Sonnet 4.6 no longer applies to some models

    A remotely supplied override for claude-sonnet-4-6 is now skipped for some models that used to receive it

    found in this entry's text

  2. v2.1.293
    Haiku model names now go through the third-party Sonnet default check

    On third-party providers, Haiku model names are no longer skipped by the check that sets up the Sonnet default model

    found in this entry's text

  3. v2.1.287
    Sonnet model entries no longer mark Bedrock, Vertex and Foundry as natively 1M

    Two Sonnet model entries no longer flag Bedrock, Vertex and Foundry as supporting the 1M-token context window natively

    found in this entry's text

  4. v2.1.285
    Effort picker shows high as Recommended, and claude-sonnet-5 is listed with high effort

    The high effort option is now labelled Recommended instead of Default, and the model list includes claude-sonnet-5 set to high effort

    found in this entry's text

  5. v2.1.284
    Sonnet 5.5 added and made the default for the sonnet model name

    Sonnet 5.5 (claude-sonnet-5-5) is now in the model list and is what sonnet picks when using Anthropic directly

    found in this entry's text

  6. v2.1.284
    The sonnet model name now points to Sonnet 5.5 on the Anthropic API

    Choosing sonnet now selects Sonnet 5.5 instead of Sonnet 5 on the Anthropic API, while Bedrock, Vertex and other providers keep older models

    found in this entry's text

  7. v2.1.284
    Claude Code's built-in model list now points to Opus 5.5 and Sonnet 5.5

    Claude Code's built-in current models are now claude-opus-5-5 and claude-sonnet-5-5, with claude-opus-5 and claude-sonnet-5 as the previous ones

    found in this entry's text

  8. v2.1.280
    Future model IDs (opus-4-6, opus-4-7, opus-4-8, sonnet-4-6) added to model-recency comparison list

    Model-recency list gains claude-opus-4-6, claude-sonnet-4-6, claude-opus-4-7 and claude-opus-4-8

    found in this entry's text

  9. v2.1.275
    Offline/fallback model catalog switches ccr/ccd default model from Sonnet 4.6 to claude-opus-5

    Fallback model list now defaults 'ccr' and 'ccd' to claude-opus-5 instead of Sonnet 4.6 when the live catalog is unreachable

    found in this entry's text

  10. v2.1.268
    Model family allowlist extended with placeholder future models

    Model list now recognizes placeholder future Claude models like claude-opus-4-6 and claude-sonnet-4-6

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

  11. v2.1.248
    Per-surface context limits for claude-sonnet-5

    Context limits for claude-sonnet-5 are 500,000 on two surfaces and a million elsewhere.

    found in this entry's text

  12. v2.1.248
    Unreleased Mythos and next-generation model ids in the bundled tables

    Model tables carry ids for a Mythos preview and a 5-series family, not selectable.

    found in this entry's text

  13. v2.1.201
  14. v2.1.197
  15. v2.1.197
    Sonnet 5 Added to the 1M Context Picker

    found in this entry's text

  16. v2.1.195
    Effort Levels Now Enforced Per-Organization

    found in this entry's text

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

    found in this entry's text

  18. v2.1.174
    Advisor Model Capability Enforcement

    found in this entry's text

  19. v2.1.97

    found in this entry's text

  20. v2.1.51
    Model Selector Version Hints

    found in this entry's text

First cited

3

The earliest release whose published evidence quoted claude-sonnet-4-6 was v2.1.195, 26 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
v2.1.19526 Jun 2026claude-sonnet-4-6
v2.1.28022 Sep 2026"claude-opus-4-6", "claude-sonnet-4-6", "claude-opus-4-7", "claude-opus-4-8",
v2.1.2937 Oct 2026if (n === "claude-sonnet-4-6" || n === "claude-sonnet-4-5") return;

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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