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ADMIN_MODELS_AUTO_MODEL_FIX.md

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+# Admin Models Auto Model Fix
+
+## Summary
+Fixed two issues with the admin models page related to the auto model setting for hobby/free plan users:
+
+1. **Added missing UI**: Created the UI elements for setting the auto model for hobby/free plan users
+2. **Fixed model selection logic**: Ensured that paid plan users can select their own models without the auto model setting interfering
+
+## Changes Made
+
+### 1. Frontend - admin.html
+**File**: `/home/engine/project/chat/public/admin.html`
+
+Added a new card section for configuring the auto model for hobby/free plan users:
+- Form: `auto-model-form`
+- Select dropdown: `auto-model-select`
+- Status display: `auto-model-status`
+
+The UI explains that this setting only affects hobby/free plan users, while paid plan users can select their own models.
+
+### 2. Backend - server.js
+**File**: `/home/engine/project/chat/server.js`
+
+Modified the `resolvePlanModel()` function to fix the model selection logic:
+
+**Previous Behavior**:
+- For paid plans, if configured models existed, it would always return the first configured model, ignoring user selections
+
+**New Behavior**:
+- **For hobby/free plan users**: 
+  - Uses the admin-configured `freePlanModel` setting when no specific model is requested
+  - Still allows them to explicitly request specific models if they have a valid tier
+  
+- **For paid plan users**:
+  - Always respects the user's model selection
+  - If user requests a model (even without a tier), uses it
+  - Only falls back to first configured model if user doesn't request anything or requests 'auto'
+
+## Test Results
+
+Created comprehensive tests (`test_model_resolution.js`) that verify:
+
+✓ Hobby users get the auto model when no specific request  
+✓ Hobby users get the auto model when requesting 'auto'  
+✓ Hobby users can explicitly request other models  
+✓ Paid users always get their requested model  
+✓ Paid users can request models without tiers  
+✓ Paid users get first configured model when no request  
+✓ Paid users get first configured model when requesting 'auto'  
+
+All 8 test cases pass.
+
+## Technical Details
+
+### Model Resolution Flow
+
+1. **Explicit model with tier (not 'auto')**: Return requested model immediately
+2. **Hobby/Free plan**:
+   - Check admin's `freePlanModel` setting
+   - Fall back to first configured model
+   - Fall back to default model
+3. **Paid plan**:
+   - If specific model requested (not 'auto'), use it
+   - Otherwise use first configured model
+   - Fall back to default model
+
+### API Integration
+
+The feature integrates with existing API endpoints:
+- **GET** `/api/admin/plan-settings` - Retrieves current settings including `freePlanModel`
+- **POST** `/api/admin/plan-settings` - Saves the `freePlanModel` setting
+
+### JavaScript Integration
+
+The admin.js file already had all the necessary handlers:
+- `populateAutoModelOptions()` - Populates the dropdown with available models
+- Form submission handler at lines 1515-1532
+- Proper element references at lines 38-40
+
+## User Impact
+
+### For Admins
+- New UI section in Admin Panel → Build models page
+- Can configure which model hobby/free users automatically use
+- Clear indication that paid users can choose their own models
+
+### For Hobby/Free Plan Users
+- Automatically assigned the admin-configured model
+- Can still explicitly select other models if available
+
+### For Paid Plan Users
+- Full control over model selection
+- Their choices are always respected
+- Auto model setting does not affect them