# ✅ Model Update: Claude Sonnet 3.7 + Nova Premier

## 🎯 **UPDATE COMPLETED**

The application has been successfully updated to use the latest and most powerful models with intelligent fallback.

## 🤖 **New Model Hierarchy (Inference Profiles)**

### **1. Primary Model: Claude Sonnet 3.7 (Inference Profile)**
- **Model ID**: `us.anthropic.claude-3-7-sonnet-20250219-v1:0`
- **Type**: Inference Profile
- **Status**: ✅ **ACTIVE** (Available in us-east-1)
- **Performance**: Latest and most capable Claude model with optimized inference
- **Use Case**: Primary model for both code generation and execution

### **2. Fallback Model: Nova Premier (Inference Profile)**
- **Model ID**: `us.amazon.nova-premier-v1:0`
- **Type**: Inference Profile
- **Status**: ✅ **AVAILABLE** (Fallback ready)
- **Performance**: High-performance Amazon model with optimized inference
- **Use Case**: Automatic fallback if Claude Sonnet 3.7 unavailable

### **3. Last Resort: Claude 3.5 Sonnet (Standard Model)**
- **Model ID**: `anthropic.claude-3-5-sonnet-20241022-v2:0`
- **Type**: Standard Model
- **Status**: ✅ **AVAILABLE** (Safety net)
- **Performance**: Proven reliable model
- **Use Case**: Final fallback to ensure service availability

## 🔧 **Implementation Details**

### **Intelligent Model Selection**
```python
def create_bedrock_model_with_fallback(aws_region: str):
    # 1. Try Claude Sonnet 3.7 (primary)
    # 2. Fall back to Nova Premier
    # 3. Use Claude 3.5 Sonnet as last resort
    # 4. Automatic availability checking
    # 5. Graceful error handling
```

### **Features Added**
- ✅ **Automatic Model Detection**: Checks availability before initialization
- ✅ **Intelligent Fallback**: Seamless transition between models
- ✅ **Error Handling**: Graceful degradation with informative logging
- ✅ **Status Reporting**: Health endpoints show current model in use
- ✅ **Performance Optimization**: Uses best available model automatically

## 📊 **Current Status**

### **Test Results**
```bash
🎯 Model Fallback Testing
✅ Selected Model: us.anthropic.claude-3-7-sonnet-20250219-v1:0
🎉 Using PRIMARY inference profile: Claude Sonnet 3.7
✅ Agents initialized successfully
🎯 Confirmed: Using inference profile ID
```

### **Backend Status**
```json
{
  "status": "healthy",
  "current_model": "us.anthropic.claude-3-7-sonnet-20250219-v1:0",
  "architecture": {
    "code_generation": "Strands-Agents Agent (Claude Sonnet 3.7 Inference Profile)",
    "code_execution": "Agentcore Agent (Claude Sonnet 3.7 Inference Profile)"
  }
}
```

## 🚀 **Benefits**

### **Performance Improvements**
- **Latest AI Capabilities**: Claude Sonnet 3.7 provides state-of-the-art performance
- **Better Code Generation**: More accurate and efficient Python code
- **Enhanced Problem Solving**: Superior reasoning and logic capabilities
- **Improved Error Handling**: Better understanding of edge cases

### **Reliability Enhancements**
- **High Availability**: Multiple fallback options ensure service continuity
- **Automatic Recovery**: System adapts to model availability changes
- **Zero Downtime**: Seamless model switching without service interruption
- **Future-Proof**: Easy to add new models to the hierarchy

## 🎯 **Usage**

The model selection is **completely automatic**. Users don't need to change anything:

```bash
# Start the application - it will automatically use the best available model
./start.sh
```

### **Model Information in Responses**
- Health endpoint shows current model: `/health`
- Agent status shows model details: `/api/agents/status`
- System prompts include model information for transparency

## 📋 **Verification**

To verify the model update is working:

```bash
# Test model fallback logic
python test_model_fallback.py

# Check current model in use
curl http://localhost:8000/health | jq '.current_model'

# View detailed agent status
curl http://localhost:8000/api/agents/status | jq '.current_model'
```

## ✅ **Ready for Production**

The application now uses:
- **🎯 Claude Sonnet 3.7** for superior AI capabilities
- **🔄 Nova Premier** as intelligent fallback
- **🛡️ Claude 3.5 Sonnet** as safety net
- **🤖 Real AgentCore** for code execution
- **📊 Full monitoring** and status reporting

**The upgrade is complete and the application is ready for enhanced performance!** 🚀