{"version":"2.1.75","anchor":"opus-1m-context-gradual-rollout","canonical_anchor":"opus-1m-context-gradual-rollout","heading":"Opus 1M Context [Gradual Rollout]","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.75\/e\/opus-1m-context-gradual-rollout","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.75","markdown":"### Opus 1M Context [Gradual Rollout]\n\n**What**\n\nThe Opus 1M context window default is controlled by the `tengu_cobalt_compass` feature flag with a default of `false`.\n\n**Status**\n\nFeature-flagged, rolling out gradually.\n\n**Details**\n\n- The function `UH()` checks `tengu_cobalt_compass` \u2014 returns `false` by default\n- Only applies to first-party users (not API key users or third-party)\n- Excluded when `je()` (demo mode) or `ZC()` (certain restricted contexts) is active\n- Once enabled server-side, migration is automatic\n\n**Evidence**\n\nFeature gate check (search for `\"tengu_cobalt_compass\"`) \u2014 `UH()` at line ~532570\n\n- Flag `tengu_cobalt_compass`: On for this account, and not off by default (read for one account on one subscription tier against v2.1.75; this account: on, anonymous baseline: on, compiled default: no gate table built for this version) 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."}