diff --git a/src/main/services/schedule/ScheduledTaskExecutor.ts b/src/main/services/schedule/ScheduledTaskExecutor.ts
index 01577b0d..43cabf0b 100644
--- a/src/main/services/schedule/ScheduledTaskExecutor.ts
+++ b/src/main/services/schedule/ScheduledTaskExecutor.ts
@@ -55,15 +55,6 @@ function buildProviderFastModeArgs(config: ScheduleLaunchConfig): string[] {
 }
 
 function validateFastModeLaunchConfig(config: ScheduleLaunchConfig): void {
-  if (
-    config.providerId === 'codex' &&
-    config.fastMode === 'on' &&
-    config.resolvedFastMode !== true
-  ) {
-    throw new Error(
-      'Codex Fast mode was requested for this schedule, but the saved launch profile is not Fast-eligible. Reopen the schedule and save it again with a supported ChatGPT account configuration.'
-    );
-  }
   if (config.providerId !== 'codex' || config.resolvedFastMode !== true) {
     return;
   }
diff --git a/src/main/services/team/TeamProvisioningService.ts b/src/main/services/team/TeamProvisioningService.ts
index b142e1bf..0402addd 100644
--- a/src/main/services/team/TeamProvisioningService.ts
+++ b/src/main/services/team/TeamProvisioningService.ts
@@ -4987,22 +4987,8 @@ export class TeamProvisioningService {
       );
     }
 
-    const codexSelection = resolveCodexSelectionFromFacts({
-      selectedModel: params.model,
-      facts: params.facts,
-    });
-    const codexFastResolution = resolveCodexFastMode({
-      selection: codexSelection,
-      selectedFastMode: params.fastMode,
-    });
-    if ((params.fastMode ?? 'inherit') === 'on' && !codexFastResolution.selectable) {
-      throw new Error(
-        `${params.actorLabel} enables Codex Fast mode, but ${
-          codexFastResolution.disabledReason ??
-          'it is unavailable for the selected runtime, model, or auth mode.'
-        }`
-      );
-    }
+    // Codex Fast is optional acceleration. If it is no longer eligible, the launch identity
+    // resolves it to normal Codex mode instead of blocking an otherwise launch-ready model.
 
     if (!explicitModel || params.facts.modelIds.has(explicitModel)) {
       return;
diff --git a/test/main/services/schedule/ScheduledTaskExecutor.test.ts b/test/main/services/schedule/ScheduledTaskExecutor.test.ts
index d2ebed47..15ccddeb 100644
--- a/test/main/services/schedule/ScheduledTaskExecutor.test.ts
+++ b/test/main/services/schedule/ScheduledTaskExecutor.test.ts
@@ -529,26 +529,32 @@ describe('ScheduledTaskExecutor', () => {
     proc.emit('close', 0);
   });
 
-  it('rejects explicit Codex schedule Fast before spawn when saved eligibility is false', async () => {
+  it('runs a standard Codex schedule when saved Fast eligibility is false', async () => {
+    const proc = createMockProcess();
+    mockSpawnCli.mockReturnValue(proc);
+
     const executor = new ScheduledTaskExecutor();
 
-    await expect(
-      executor.execute(
-        makeRequest({
-          config: {
-            cwd: '/tmp/project',
-            prompt: 'do it',
-            providerId: 'codex',
-            providerBackendId: 'codex-native',
-            model: 'gpt-5.4-mini',
-            fastMode: 'on',
-            resolvedFastMode: false,
-          },
-        })
-      )
-    ).rejects.toThrow('Codex Fast mode was requested');
+    void executor.execute(
+      makeRequest({
+        config: {
+          cwd: '/tmp/project',
+          prompt: 'do it',
+          providerId: 'codex',
+          providerBackendId: 'codex-native',
+          model: 'gpt-5.4-mini',
+          fastMode: 'on',
+          resolvedFastMode: false,
+        },
+      })
+    );
+    await flushAsync();
 
-    expect(mockSpawnCli).not.toHaveBeenCalled();
+    const args = mockSpawnCli.mock.calls[0][1] as string[];
+    expect(args).not.toContain('service_tier="fast"');
+    expect(args).not.toContain('features.fast_mode=true');
+
+    proc.emit('close', 0);
   });
 
   it('does not hard-code Codex Fast schedules to GPT-5.4 when saved eligibility is true', async () => {
diff --git a/test/main/services/team/TeamProvisioningServicePrepare.test.ts b/test/main/services/team/TeamProvisioningServicePrepare.test.ts
index 55ec9e58..453c2685 100644
--- a/test/main/services/team/TeamProvisioningServicePrepare.test.ts
+++ b/test/main/services/team/TeamProvisioningServicePrepare.test.ts
@@ -4556,7 +4556,7 @@ describe('TeamProvisioningService prepare/auth behavior', () => {
     });
   });
 
-  it('rejects explicit Codex Fast before launch when auth or model eligibility is invalid', () => {
+  it('allows explicit Codex Fast to downgrade before launch when auth or model eligibility is invalid', () => {
     const svc = new TeamProvisioningService();
     const facts = {
       defaultModel: 'gpt-5.4-mini',
@@ -4624,7 +4624,27 @@ describe('TeamProvisioningService prepare/auth behavior', () => {
         fastMode: 'on',
         facts,
       })
-    ).toThrow('enables Codex Fast mode');
+    ).not.toThrow();
+
+    expect(
+      (svc as any).buildProviderModelLaunchIdentity({
+        request: {
+          providerId: 'codex',
+          providerBackendId: 'codex-native',
+          model: 'gpt-5.4-mini',
+          fastMode: 'on',
+        },
+        facts,
+      })
+    ).toMatchObject({
+      providerId: 'codex',
+      providerBackendId: 'codex-native',
+      selectedModel: 'gpt-5.4-mini',
+      resolvedLaunchModel: 'gpt-5.4-mini',
+      selectedFastMode: 'on',
+      resolvedFastMode: false,
+      fastResolutionReason: expect.stringContaining('API key mode uses standard API pricing'),
+    });
   });
 
   it('rejects Anthropic max and fast when the exact resolved launch model does not support them', () => {