init

migrations/migrateOpusToOpus1m.ts

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+import { logEvent } from '../services/analytics/index.js'
+import {
+  getDefaultMainLoopModelSetting,
+  isOpus1mMergeEnabled,
+  parseUserSpecifiedModel,
+} from '../utils/model/model.js'
+import {
+  getSettingsForSource,
+  updateSettingsForSource,
+} from '../utils/settings/settings.js'
+
+/**
+ * Migrate users with 'opus' pinned in their settings to 'opus[1m]' when they
+ * are eligible for the merged Opus 1M experience (Max/Team Premium on 1P).
+ *
+ * CLI invocations with --model opus are unaffected: that flag is a runtime
+ * override and does not touch userSettings, so it continues to use plain Opus.
+ *
+ * Pro subscribers are skipped — they retain separate Opus and Opus 1M options.
+ * 3P users are skipped — their model strings are full model IDs, not aliases.
+ *
+ * Idempotent: only writes if userSettings.model is exactly 'opus'.
+ */
+export function migrateOpusToOpus1m(): void {
+  if (!isOpus1mMergeEnabled()) {
+    return
+  }
+
+  const model = getSettingsForSource('userSettings')?.model
+  if (model !== 'opus') {
+    return
+  }
+
+  const migrated = 'opus[1m]'
+  const modelToSet =
+    parseUserSpecifiedModel(migrated) ===
+    parseUserSpecifiedModel(getDefaultMainLoopModelSetting())
+      ? undefined
+      : migrated
+  updateSettingsForSource('userSettings', { model: modelToSet })
+
+  logEvent('tengu_opus_to_opus1m_migration', {})
+}