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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

Reference / Environment variables

VERTEX_REGION_CLAUDE_5_OPUS

A Claude Code environment variable, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

What it is

Opus 5 is now the default Opus, with a 1M-context option in the model picker.

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

Presence across releases

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.

Changelog entries naming it

  1. v2.1.219Opus 5 replaces Opus 4.8 as the default Opus model

    Opus 5 is now the default Opus, with a 1M-context option in the model picker.

    named in this entry

  2. v2.1.219Opus 5 wired through region env vars, refusal fallbacks and pricing copy

    An Opus 5 model is wired through region variables, fast mode, 1M context and pricing text.

    named in this entry

Documentation pages

None of Anthropic's documentation pages this site has a copy of carries this name.

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 environment variable does. All environment variables.