diff --git a/src/renderer/src/components/native-chat/native-chat-pty-retired-model.test.ts b/src/renderer/src/components/native-chat/native-chat-pty-retired-model.test.ts
index 8c3e59c9ba7..cfaf7174785 100644
--- a/src/renderer/src/components/native-chat/native-chat-pty-retired-model.test.ts
+++ b/src/renderer/src/components/native-chat/native-chat-pty-retired-model.test.ts
@@ -1,5 +1,9 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
-import { mergeDiscoveredAuthoritativeModels } from '../../../../shared/agent-session-option-catalog'
+import {
+  mergeDiscoveredAuthoritativeModels,
+  type CatalogModel
+} from '../../../../shared/agent-session-option-catalog'
+import { CLAUDE_SESSION_OPTION_CATALOG } from '../../../../shared/agent-session-option-catalog-claude-codex'
 import { GROK_SESSION_OPTION_CATALOG } from '../../../../shared/agent-session-option-catalog-grok'
 import { updateNativeChatSessionOptionDefaults } from '../../../../shared/native-chat-session-option-defaults'
 import type { PersistedNativeChatSessionOptions } from '../../../../shared/native-chat-session-options'
@@ -94,3 +98,60 @@ describe('retired grok model untracking', () => {
     expect(persisted().grok?.model).toBe('grok-5')
   })
 })
+
+describe('retired Claude model untracking', () => {
+  beforeEach(() => clearNativeChatSessionOptionCacheForTests())
+
+  const discoveredClaude = (): CatalogModel[] => [
+    {
+      ...CLAUDE_SESSION_OPTION_CATALOG.models.find((model) => model.id === 'fable')!,
+      isDefault: true,
+      options: CLAUDE_SESSION_OPTION_CATALOG.models.find((model) => model.id === 'fable')!.options
+    },
+    { id: 'sonnet', label: 'Sonnet', options: [] }
+  ]
+
+  function createClaudeSurface(args?: Partial<CreateNativeChatPtySessionOptionsArgs>): {
+    surface: NativeChatPtySessionOptionsSurface
+    persisted: () => PersistedNativeChatSessionOptions
+  } {
+    let persisted: PersistedNativeChatSessionOptions = {}
+    const surface = createNativeChatPtySessionOptions({
+      agent: 'claude',
+      scopeKey: 'claude-pty-1',
+      mode: 'live',
+      dispatchCommand: vi.fn(),
+      persistSelection: ({ modelId, optionId, value, adoptModelAsLaunchDefault }) => {
+        persisted = updateNativeChatSessionOptionDefaults({
+          persisted,
+          agent: 'claude',
+          modelId,
+          optionId,
+          value,
+          adoptModelAsLaunchDefault
+        })
+      },
+      ...args
+    })!
+    return { surface, persisted: () => persisted }
+  }
+
+  it('untracks an omitted Claude alias', () => {
+    seedNativeChatAppliedSessionOptions('claude-pty-1', 'claude', { model: 'opus' })
+    const { surface, persisted } = createClaudeSurface()
+
+    surface.replaceModels(discoveredClaude())
+
+    expect(readNativeChatSessionOptionCache('claude-pty-1')?.model).toBeUndefined()
+    expect(persisted().claude).toBeUndefined()
+  })
+
+  it('does not adopt an omitted typed Claude alias as launch default', () => {
+    const { surface, persisted } = createClaudeSurface({ initialModels: discoveredClaude() })
+
+    surface.recordOutgoingCommand('/model opus')
+    expect(persisted().claude?.model).toBeUndefined()
+    surface.recordOutgoingCommand('/model fable')
+    expect(persisted().claude?.model).toBe('fable')
+  })
+})
diff --git a/src/renderer/src/components/native-chat/native-chat-pty-session-options.test.ts b/src/renderer/src/components/native-chat/native-chat-pty-session-options.test.ts
index e653a29258f..50acadaac35 100644
--- a/src/renderer/src/components/native-chat/native-chat-pty-session-options.test.ts
+++ b/src/renderer/src/components/native-chat/native-chat-pty-session-options.test.ts
@@ -631,12 +631,11 @@ describe('native chat PTY session options', () => {
     })
   })
 
-  it('keeps a tracked alias selectable when the host catalog omits it', async () => {
+  it('drops a tracked Claude alias when the host catalog omits it', () => {
     seedNativeChatAppliedSessionOptions('pty-1', 'claude', {
       model: 'opus',
       effort: 'xhigh'
     })
-    const dispatch = vi.fn()
     const surface = createNativeChatPtySessionOptions({
       agent: 'claude',
       scopeKey: 'pty-1',
@@ -646,23 +645,13 @@ describe('native chat PTY session options', () => {
         { id: 'sonnet', label: 'Sonnet', options: [] }
       ],
       mode: 'live',
-      dispatchCommand: dispatch
+      dispatchCommand: vi.fn()
     })!
 
     expect(surface.getSnapshot()[0].kind).toMatchObject({
-      currentValue: 'opus',
-      choices: expect.arrayContaining([
-        { value: 'opus', label: 'Opus', description: expect.any(String) }
-      ])
+      choices: expect.not.arrayContaining([{ value: 'opus' }])
     })
-    expect(surface.getSnapshot().find(({ id }) => id === 'effort')).toMatchObject({
-      settable: true,
-      kind: { currentValue: 'xhigh' }
-    })
-
-    await surface.setOption('effort', 'high')
-
-    expect(dispatch).toHaveBeenCalledWith('/effort high')
+    expect(readNativeChatSessionOptionCache('pty-1')?.model).toBeUndefined()
   })
 
   it('drops the reconciled row once the tracked model moves onto the host catalog', async () => {
diff --git a/src/renderer/src/components/native-chat/native-chat-pty-session-options.ts b/src/renderer/src/components/native-chat/native-chat-pty-session-options.ts
index aa7562b5944..4ceb178ce21 100644
--- a/src/renderer/src/components/native-chat/native-chat-pty-session-options.ts
+++ b/src/renderer/src/components/native-chat/native-chat-pty-session-options.ts
@@ -1,4 +1,5 @@
 import {
+  discoveredModelsDefineCatalogMembership,
   getAgentSessionOptionCatalog,
   type CatalogModel
 } from '../../../../shared/agent-session-option-catalog'
@@ -80,7 +81,7 @@ export function createNativeChatPtySessionOptions(
    *  the picker via re-injection and re-persist the fatal `-m` on any later option
    *  write, undoing the settings retirement. */
   const untrackRetiredModel = (): boolean => {
-    if (!catalog.discoveredModelsAreAuthoritative || !modelsAreDiscovered) {
+    if (!discoveredModelsDefineCatalogMembership(catalog) || !modelsAreDiscovered) {
       return false
     }
     const trackedId = typeof record.model?.value === 'string' ? record.model.value : null
@@ -143,7 +144,8 @@ export function createNativeChatPtySessionOptions(
    *  adopting either would emit an `-m` that is fatal on an account without it. */
   const modelIsAdoptableAsLaunchDefault = (modelId: string): boolean =>
     modelsAreDiscovered
-      ? !catalog.discoveredModelsAreAuthoritative || models.some((model) => model.id === modelId)
+      ? !discoveredModelsDefineCatalogMembership(catalog) ||
+        models.some((model) => model.id === modelId)
       : record.model !== undefined
 
   /** Every persist path — picker applies and typed commands — funnels through here. */
diff --git a/src/renderer/src/components/native-chat/native-chat-retire-persisted-model.test.ts b/src/renderer/src/components/native-chat/native-chat-retire-persisted-model.test.ts
index 2ac8eac3a16..5af6025b300 100644
--- a/src/renderer/src/components/native-chat/native-chat-retire-persisted-model.test.ts
+++ b/src/renderer/src/components/native-chat/native-chat-retire-persisted-model.test.ts
@@ -60,6 +60,16 @@ describe('retirePersistedModelMissingFromDiscovery', () => {
     })
   })
 
+  it('clears a persisted Claude alias omitted by a replacing probe', async () => {
+    persist({ claude: { model: 'opus', valuesByModel: { opus: { effort: 'high' } } } })
+    await retirePersistedModelMissingFromDiscovery('claude', models('fable', 'sonnet'))
+    expect(mocks.storeState.updateSettings).toHaveBeenCalledWith({
+      nativeChatSessionOptions: {
+        claude: { valuesByModel: { opus: { effort: 'high' } } }
+      }
+    })
+  })
+
   it('keeps a persisted id the probe still lists', async () => {
     persist({ grok: { model: 'grok-4.5' } })
     await retirePersistedModelMissingFromDiscovery('grok', models('grok-4.5', 'grok-build'))
diff --git a/src/renderer/src/components/native-chat/native-chat-session-option-discovery.ts b/src/renderer/src/components/native-chat/native-chat-session-option-discovery.ts
index 4e61f560577..694abde3bbd 100644
--- a/src/renderer/src/components/native-chat/native-chat-session-option-discovery.ts
+++ b/src/renderer/src/components/native-chat/native-chat-session-option-discovery.ts
@@ -1,6 +1,7 @@
 import type { AgentType } from '../../../../shared/agent-status-types'
 import {
   createClaudeCatalogOptions,
+  discoveredModelsDefineCatalogMembership,
   getAgentSessionOptionCatalog,
   type CatalogModel
 } from '../../../../shared/agent-session-option-catalog'
@@ -79,7 +80,8 @@ export async function discoverNativeChatCatalogModels(
     !result.success ||
     result.models.length === 0 ||
     // Why: static fallbacks must never impersonate a probe whose rows replace the seed.
-    ((catalog?.discoveredModelsReplaceSeed || catalog?.discoveredModelsAreAuthoritative) &&
+    (catalog &&
+      discoveredModelsDefineCatalogMembership(catalog) &&
       result.catalogOrigin !== 'probe')
   ) {
     return null
diff --git a/src/renderer/src/components/native-chat/native-chat-session-option-enrichment.test.ts b/src/renderer/src/components/native-chat/native-chat-session-option-enrichment.test.ts
index 3765a1b53a3..cdf6e6e3135 100644
--- a/src/renderer/src/components/native-chat/native-chat-session-option-enrichment.test.ts
+++ b/src/renderer/src/components/native-chat/native-chat-session-option-enrichment.test.ts
@@ -357,6 +357,22 @@ describe('native chat session option enrichment', () => {
     ).toEqual({ model: 'retired' })
   })
 
+  it('drops a persisted Claude alias missing from a replacing probe but keeps Fable', async () => {
+    const persisted = {
+      claude: { model: 'opus', valuesByModel: { opus: { effort: 'high' } } }
+    }
+    const discover = vi.fn().mockResolvedValue([{ id: 'sonnet', label: 'Sonnet', options: [] }])
+    ensureNativeChatModelEnrichment({ agent: 'claude', hostKey: 'local', discover })
+    await vi.waitFor(() => expect(readNativeChatEnrichedModels('claude', 'local')).not.toBeNull())
+
+    expect(resolveNativeChatLaunchSessionOptions(persisted, 'claude')).toBeUndefined()
+    expect(resolveNativeChatLaunchSessionOptions({ claude: { model: 'fable' } }, 'claude')).toEqual(
+      {
+        model: 'fable'
+      }
+    )
+  })
+
   it('rejects a spec fallback for Claude, whose successful probe replaces the seed', async () => {
     mocks.discoverRuntimeCommitMessageModels.mockResolvedValue({
       success: true,
diff --git a/src/renderer/src/components/native-chat/native-chat-session-option-enrichment.ts b/src/renderer/src/components/native-chat/native-chat-session-option-enrichment.ts
index fd2036e0023..be586e4c8fa 100644
--- a/src/renderer/src/components/native-chat/native-chat-session-option-enrichment.ts
+++ b/src/renderer/src/components/native-chat/native-chat-session-option-enrichment.ts
@@ -1,5 +1,6 @@
 import type { AgentType } from '../../../../shared/agent-status-types'
 import {
+  discoveredModelsDefineCatalogMembership,
   getAgentSessionOptionCatalog,
   mergeCatalogModels,
   mergeDiscoveredModelsWithConsentGatedSeeds,
@@ -55,7 +56,8 @@ export function resolveNativeChatLaunchSessionOptions(
   agent: AgentType
 ): Record<string, SessionOptionValue> | undefined {
   const values = resolveNativeChatSessionOptionDefaults(persisted, agent)
-  if (!values || !getAgentSessionOptionCatalog(agent)?.discoveredModelsAreAuthoritative) {
+  const catalog = getAgentSessionOptionCatalog(agent)
+  if (!values || !catalog || !discoveredModelsDefineCatalogMembership(catalog)) {
     return values
   }
   let probed = false
diff --git a/src/renderer/src/components/native-chat/use-native-chat-session-options.ts b/src/renderer/src/components/native-chat/use-native-chat-session-options.ts
index 54237b05628..a0efa633377 100644
--- a/src/renderer/src/components/native-chat/use-native-chat-session-options.ts
+++ b/src/renderer/src/components/native-chat/use-native-chat-session-options.ts
@@ -1,6 +1,7 @@
 import { useEffect, useMemo, useRef, useSyncExternalStore } from 'react'
 import type { AgentType } from '../../../../shared/agent-status-types'
 import {
+  discoveredModelsDefineCatalogMembership,
   getAgentSessionOptionCatalog,
   type CatalogModel
 } from '../../../../shared/agent-session-option-catalog'
@@ -68,7 +69,8 @@ export async function retirePersistedModelMissingFromDiscovery(
   agent: AgentType,
   models: readonly CatalogModel[]
 ): Promise<void> {
-  if (!getAgentSessionOptionCatalog(agent)?.discoveredModelsAreAuthoritative) {
+  const catalog = getAgentSessionOptionCatalog(agent)
+  if (!catalog || !discoveredModelsDefineCatalogMembership(catalog)) {
     return
   }
   // An empty list means the probe failed, not that the account has no models.
diff --git a/src/shared/agent-session-option-catalog.test.ts b/src/shared/agent-session-option-catalog.test.ts
index a3b096ce4f1..672af7cee8b 100644
--- a/src/shared/agent-session-option-catalog.test.ts
+++ b/src/shared/agent-session-option-catalog.test.ts
@@ -1,5 +1,6 @@
 import { describe, expect, it } from 'vitest'
 import {
+  discoveredModelsDefineCatalogMembership,
   getAgentSessionOptionCatalog,
   mergeCatalogModels,
   mergeDiscoveredModelsWithConsentGatedSeeds
@@ -11,6 +12,18 @@ import {
 } from './native-chat-session-option-defaults'
 
 describe('agent session option catalog', () => {
+  it('shares membership policy across replacing and authoritative catalogs', () => {
+    expect(discoveredModelsDefineCatalogMembership(getAgentSessionOptionCatalog('claude')!)).toBe(
+      true
+    )
+    expect(discoveredModelsDefineCatalogMembership(getAgentSessionOptionCatalog('grok')!)).toBe(
+      true
+    )
+    expect(discoveredModelsDefineCatalogMembership(getAgentSessionOptionCatalog('cursor')!)).toBe(
+      false
+    )
+  })
+
   it('returns no catalog for unknown agents', () => {
     expect(getAgentSessionOptionCatalog('future-agent')).toBeNull()
   })
diff --git a/src/shared/agent-session-option-catalog.ts b/src/shared/agent-session-option-catalog.ts
index 7b2bab3c5a2..a6ce7dedb79 100644
--- a/src/shared/agent-session-option-catalog.ts
+++ b/src/shared/agent-session-option-catalog.ts
@@ -40,6 +40,16 @@ export function getAgentSessionOptionCatalog(agent: AgentType): AgentSessionOpti
   return CATALOGS[agent] ?? null
 }
 
+/** Whether a successful discovery result defines the catalog's model membership. */
+export function discoveredModelsDefineCatalogMembership(
+  catalog: AgentSessionOptionCatalog
+): boolean {
+  return (
+    catalog.discoveredModelsReplaceSeed === true ||
+    catalog.discoveredModelsAreAuthoritative === true
+  )
+}
+
 export function findCatalogModel(
   catalog: AgentSessionOptionCatalog,
   modelId: string