ANTHROPIC_BETAS

A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.138, including the newest one read.

Releases whose published page names ANTHROPIC_BETAS.

1. v2.1.299 14 Oct 2026
   ANTHROPIC_BETAS no longer sends a beta that is now generally available

   A beta listed in ANTHROPIC_BETAS that is now generally available is dropped from requests, and a debug message says so

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

2. v2.1.267 9 Sep 2026
   Org-policy beta-block message reworded

   The message shown when an org policy blocks experimental beta headers was reworded

   found in this entry's text

3. v2.1.267 9 Sep 2026
   ANTHROPIC_BETAS values now filtered through a new exclusion list before being applied

   ANTHROPIC_BETAS entries are now filtered against a new exclusion list before being applied

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

4. v2.1.260 3 Sep 2026
   ANTHROPIC_BETAS env var can be blocked by org compliance policy

   Org compliance policy can now block the ANTHROPIC_BETAS environment variable entirely.

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

5. v2.1.78 17 Mar 2026

   found in this entry's text

6. v0.2.104 7 May 2025

   found in this entry's text

The earliest release whose published evidence quoted ANTHROPIC_BETAS was v2.1.260, 3 Sep 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.

One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.

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.