Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.
Flag server, over time
14
Read as
Reading
From
Until
Version installed
anonymous
["Fable","Fable 5","Fable 5.1"]
2026-10-17T05:30:04Z
2026-10-22T14:35:05Z
v2.1.302 to v2.1.308
this account
["Fable","Fable 5","Fable 5.1"]
2026-09-10T21:47:12Z
2026-10-22T14:35:05Z
v2.1.268 to v2.1.308
anonymous
no longer carried
2026-10-17T05:25:57Z
2026-10-17T05:25:57Z
v2.1.302
anonymous
["Fable","Fable 5","Fable 5.1"]
2026-09-01T18:10:06Z
2026-10-17T05:10:04Z
v2.1.251 to v2.1.302
this account
no longer carried
2026-09-10T21:46:45Z
2026-09-10T21:46:45Z
v2.1.268
this account
["Fable","Fable 5","Fable 5.1"]
2026-09-08T20:36:15Z
2026-09-10T17:40:05Z
v2.1.263 to v2.1.267
this account
no longer carried
2026-09-08T20:34:58Z
2026-09-08T20:34:58Z
v2.1.265
this account
["Fable","Fable 5","Fable 5.1"]
2026-09-06T02:40:05Z
2026-09-08T18:45:05Z
v2.1.261 to v2.1.263
this account
no longer carried
2026-09-06T02:36:19Z
2026-09-06T02:36:19Z
v2.1.263
this account
["Fable","Fable 5","Fable 5.1"]
2026-09-01T19:15:05Z
2026-09-06T01:55:04Z
v2.1.257 to v2.1.261
this account
["Fable","Fable 5"]
2026-08-14T22:10:05Z
2026-09-01T18:10:06Z
v2.1.232 to v2.1.251
anonymous
["Fable","Fable 5"]
2026-08-19T04:25:04Z
2026-09-01T18:00:05Z
v2.1.233 to v2.1.251
anonymous
no longer carried
2026-08-19T04:20:14Z
2026-08-19T04:20:14Z
v2.1.233
anonymous
["Fable","Fable 5"]
2026-08-14T22:10:05Z
2026-08-19T03:45:04Z
v2.1.232 to v2.1.233
One row per unbroken stretch of one reading, newest first, from snapshots taken every twenty-five minutes or so. No longer carried is not off: it means the flag server stopped returning the gate at all, which is what a retired experiment looks like. The version column is what was installed when the reading was taken, not what caused it.
First cited
1
The earliest release whose published evidence quoted tengu_usage_overage_included_models was v2.1.261, 4 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.
v2.1.186 – v2.1.24151 builds22 Jun 2026 → 22 Aug 2026 ◆in the build
v2.1.242 – v2.1.2464 builds24 Aug 2026 → 25 Aug 2026 ○not in the build
v2.1.247 – v2.1.2587 builds26 Aug 2026 → 1 Sep 2026 ◆in the build
v2.1.2591 build2 Sep 2026 ○not in the build
v2.1.260 – v2.1.29634 builds3 Sep 2026 → 9 Oct 2026 ◆in the build
v2.1.2991 build14 Oct 2026 ○not in the build
v2.1.3001 build14 Oct 2026 ◆in the build
v2.1.3011 build15 Oct 2026 ○not in the build
v2.1.302 – v2.1.3087 builds16 Oct 2026 → 22 Oct 2026 ◆in the build
Build by build
107
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.
BuildDateStateThe record behind it
v2.1.18622 Jun 2026·addedverdict: added · default unknown
v2.1.18723 Jun 2026·presentverdict: present · default unknown
v2.1.19024 Jun 2026·presentverdict: present · default unknown
v2.1.19124 Jun 2026·presentverdict: present · default unknown
v2.1.19325 Jun 2026·presentverdict: present · default unknown
v2.1.19526 Jun 2026·presentverdict: present · default unknown
v2.1.19629 Jun 2026·presentverdict: present · default unknown
v2.1.19730 Jun 2026·presentverdict: present · default unknown
v2.1.30216 Oct 2026·addedverdict: added · default unknown
v2.1.30318 Oct 2026·presentverdict: present · default unknown
v2.1.30419 Oct 2026·presentverdict: present · default unknown
v2.1.30520 Oct 2026·presentverdict: present · default unknown
v2.1.30621 Oct 2026·presentverdict: present · default unknown
v2.1.30721 Oct 2026·presentverdict: present · default unknown
v2.1.30822 Oct 2026·presentverdict: present · default unknown
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 feature flag does. All feature flags.