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# Model Version Update Analysis - V3.5 to V5

## Current State Analysis

### Backend Defaults
1. **`create_music.php`** (line 28):
   - Default: `$model_name = $_POST['model_name'] ?? 'V3_5';`

2. **`api.php`** (line 35):
   - Default: `$model_name = $input['model_name'] ?? 'V3_5';`

3. **`config/database.php`** (line 59):
   - Database column default: `model_version VARCHAR(10) DEFAULT 'v3'`
   - Function default: `createMusicTrack(..., $modelVersion = 'v3', ...)`

### Frontend UI
1. **Advanced Mode Dropdown** (`index.php` lines 1658-1662):
   - Options: V3_5 (Fast), V4 (Balanced), V4_5 (Premium)
   - **Missing V5 option**

2. **Pro Mode Dropdown** (`index.php` lines 1939-1944):
   - Options: V3_5 (Fast & Reliable), V4 (Balanced Quality), V4_5 (Premium Quality), V5 (Experimental)
   - V5 exists but marked as "Experimental"

3. **Modal Version** (`includes/create_music_modal.php` lines 63-67):
   - Same as Advanced Mode - missing V5

## Required Updates

### 1. Backend Defaults
- [ ] Update `create_music.php` default from `'V3_5'` to `'V5`
- [ ] Update `api.php` default from `'V3_5'` to `'V5'`
- [ ] Update `config/database.php` function default from `'v3'` to `'v5'`
- [ ] Update database column default (optional, for new records)

### 2. Frontend UI Updates
- [ ] Add V5 option to Advanced Mode dropdown in `index.php`
- [ ] Add V5 option to Advanced Mode dropdown in `includes/create_music_modal.php`
- [ ] Update Pro Mode V5 label from "Experimental" to production-ready label
- [ ] Set V5 as default/selected option in dropdowns

### 3. Files to Update
1. `create_music.php` - line 28
2. `api.php` - line 35
3. `config/database.php` - line 635 (function default)
4. `index.php` - lines 1658-1662 (Advanced Mode dropdown)
5. `index.php` - lines 1939-1944 (Pro Mode dropdown - update V5 label)
6. `includes/create_music_modal.php` - lines 63-67 (Advanced Mode dropdown)
7. `includes/create_music_modal.php` - lines 344-349 (Pro Mode dropdown)
8. `index copy.php` - lines 1431-1435 (if still in use)

## Notes
- V5 already exists in Pro Mode but is marked as "Experimental"
- Need to verify the exact API model name format (V5 vs V5_0 vs v5)
- Callback logs show API returns "chirp-v4" format, but we send "V3_5" format
- Database stores model_version but may use different format than API parameter