{"version":"2.1.174","anchor":"opus-4-6-sunset-date-notification","canonical_anchor":"opus-4-6-sunset-date-notification","heading":"Opus 4.6 Sunset Date Notification","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.174\/e\/opus-4-6-sunset-date-notification","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.174","markdown":"### Opus 4.6 Sunset Date Notification\n\nA new function checks whether the active model is `claude-opus-4-6` and, if so, reads the sunset date from the `tengu_sunset_penguin_opus46` feature flag (default: June 29, 2026). If the date has not yet passed, users will see a notification about the upcoming model retirement.\n\n**Evidence**\n\nSunset date string (search for `\"2026-06-29\"` and `\"tengu_sunset_penguin_opus46\"`)\n\n- Flag `tengu_sunset_penguin_opus46`: Not enough to say (read for one account on one subscription tier against v2.1.174; this account: no value returned, anonymous baseline: no value returned, compiled default: not a boolean we can read) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release."}