{"version":"2.1.314","anchor":"opus-48-fast-mode-deprecation-notice","canonical_anchor":"opus-48-fast-mode-deprecation-notice","heading":"Notice warns that Opus 4.8 fast mode is going away","tier":"notice","area":"Models","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.314\/e\/opus-48-fast-mode-deprecation-notice","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.314","markdown":"### Notice warns that Opus 4.8 fast mode is going away\n\nClaude Code shows a warning that Opus 4.8 fast mode is deprecated and will be removed on a date set remotely\n\n**What**\n\nA new warning notice says that fast mode for Opus 4.8 is deprecated, meaning it is being phased out, and will be removed on a given date. The date comes from a setting sent by the server. If the server sends none, the date is 30 November 2026. The notice appears only until that date.\n\n**Why**\n\nIf you use Opus 4.8 fast mode, you are warned before it is removed and have time to switch to something else.\n\n- Flag `tengu_sunset_penguin_opus48`: Not enough to say (read for one account on one subscription tier against v2.1.314; 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.\n- Area: Models\n- Tier: You'll notice\n- Useful: 3\/5\n- Signal: 3\/5\n- Scope: individual\n- Heads-up: no"}