init

migrations/migrateSonnet45ToSonnet46.ts

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+import {
+  type AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
+  logEvent,
+} from '../services/analytics/index.js'
+import {
+  isMaxSubscriber,
+  isProSubscriber,
+  isTeamPremiumSubscriber,
+} from '../utils/auth.js'
+import { getGlobalConfig, saveGlobalConfig } from '../utils/config.js'
+import { getAPIProvider } from '../utils/model/providers.js'
+import {
+  getSettingsForSource,
+  updateSettingsForSource,
+} from '../utils/settings/settings.js'
+
+/**
+ * Migrate Pro/Max/Team Premium first-party users off explicit Sonnet 4.5
+ * model strings to the 'sonnet' alias (which now resolves to Sonnet 4.6).
+ *
+ * Users may have been pinned to explicit Sonnet 4.5 strings by:
+ * - The earlier migrateSonnet1mToSonnet45 migration (sonnet[1m] → explicit 4.5[1m])
+ * - Manually selecting it via /model
+ *
+ * Reads userSettings specifically (not merged) so we only migrate what /model
+ * wrote — project/local pins are left alone.
+ * Idempotent: only writes if userSettings.model matches a Sonnet 4.5 string.
+ */
+export function migrateSonnet45ToSonnet46(): void {
+  if (getAPIProvider() !== 'firstParty') {
+    return
+  }
+
+  if (!isProSubscriber() && !isMaxSubscriber() && !isTeamPremiumSubscriber()) {
+    return
+  }
+
+  const model = getSettingsForSource('userSettings')?.model
+  if (
+    model !== 'claude-sonnet-4-5-20250929' &&
+    model !== 'claude-sonnet-4-5-20250929[1m]' &&
+    model !== 'sonnet-4-5-20250929' &&
+    model !== 'sonnet-4-5-20250929[1m]'
+  ) {
+    return
+  }
+
+  const has1m = model.endsWith('[1m]')
+  updateSettingsForSource('userSettings', {
+    model: has1m ? 'sonnet[1m]' : 'sonnet',
+  })
+
+  // Skip notification for brand-new users — they never experienced the old default
+  const config = getGlobalConfig()
+  if (config.numStartups > 1) {
+    saveGlobalConfig(current => ({
+      ...current,
+      sonnet45To46MigrationTimestamp: Date.now(),
+    }))
+  }
+
+  logEvent('tengu_sonnet45_to_46_migration', {
+    from_model:
+      model as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
+    has_1m: has1m,
+  })
+}