# ✅ Upgraded to Claude Sonnet 4.5
## 🚀 What Changed
### Model Upgrade
- ❌ **Old**: `claude-sonnet-4-20250514` (Claude Sonnet 4)
- ✅ **New**: `claude-sonnet-4-5-20250929` (Claude Sonnet 4.5)
## 📊 Claude Sonnet 4.5 Benefits
According to [Anthropic's documentation](https://docs.claude.com/en/docs/about-claude/models/overview):
### Key Improvements
- 🧠 **Most Intelligent Model** - Anthropic's best model for complex reasoning
- 💻 **Superior Coding** - Enhanced code generation and analysis capabilities
- 🤖 **Complex Agents** - Better at multi-step reasoning and planning
- ⚡ **Better Context Understanding** - Improved analytical capabilities
- 🎯 **Higher Accuracy** - More precise and reliable outputs
### Perfect for Deep Think Tool
Our MCP server's `think` tool benefits from:
- Enhanced strategic planning capabilities
- Better architecture analysis
- More nuanced problem-solving
- Improved technical recommendations
- Superior code review insights
## ✅ Updated Components
### 1. Source Code
- ✅ `src/index.ts` - Default model updated
- ✅ Config schema uses Sonnet 4.5
### 2. Environment
- ✅ `.env` - Model updated to `claude-sonnet-4-5-20250929`
- ✅ `env.example` - Documentation updated
### 3. Cursor Configuration
- ✅ `~/.cursor/mcp.json` - URL parameter updated
- ✅ Now using Sonnet 4.5 by default
### 4. Docker
- ✅ Container rebuilt with new model
- ✅ Environment variables updated
- ✅ Running successfully
### 5. GitHub
- ✅ All changes committed
- ✅ Pushed to main branch
## 🔍 Verification
### Check Docker Container
```bash
docker ps | grep claude-vision
# Should show: Up X seconds
docker logs claude-vision-mcp-server --tail 10
# Should show: Config schema: 2 fields (1 required)
```
### Check Model Version
The MCP server now uses `claude-sonnet-4-5-20250929` by default.
## 🧪 Testing
### **IMPORTANT: Restart Cursor IDE**
Close all Cursor windows and reopen to load the updated configuration.
### Test with Complex Reasoning
Try this prompt to see Sonnet 4.5's enhanced capabilities:
```
Use the think tool to analyze:
"Design a comprehensive microservices architecture for a real-time collaborative document editing platform (like Google Docs). Consider:
- Real-time synchronization challenges
- Conflict resolution strategies
- Scalability for 1M+ concurrent users
- Data consistency guarantees
- Performance optimization
- Technology stack recommendations"
```
**Expected**: Detailed, sophisticated analysis showcasing Sonnet 4.5's superior reasoning.
## 📝 Model Identifier Details
### Anthropic API (Direct)
```
claude-sonnet-4-5-20250929
```
### Amazon Bedrock
```
anthropic.claude-sonnet-4-5-20250929-v1:0
```
### Google Cloud Vertex AI
```
claude-sonnet-4-5@20250929
```
**We use the Anthropic API directly**, so our identifier is `claude-sonnet-4-5-20250929`.
## 💡 Usage Tips
### Leverage Enhanced Capabilities
**Before (Sonnet 4):**
```
Use the think tool: What's better, REST or GraphQL?
```
**Now (Sonnet 4.5):**
```
Use the think tool: Compare REST vs GraphQL vs gRPC for a microservices architecture.
Consider: performance, developer experience, tooling ecosystem, real-time requirements,
mobile client support, and migration complexity from existing REST APIs.
Context: High-traffic e-commerce platform, 50+ microservices, React Native mobile apps
```
Sonnet 4.5 excels at these complex, multi-faceted analyses!
## 🎯 Best Use Cases for Sonnet 4.5
1. **Complex Architecture Decisions**
- Multi-service system design
- Scalability planning
- Technology stack evaluation
2. **Advanced Code Analysis**
- Security review
- Performance optimization
- Refactoring strategies
3. **Strategic Planning**
- Technical roadmap creation
- Migration strategies
- Risk assessment
4. **Problem Solving**
- Debugging complex issues
- Root cause analysis
- Solution trade-off evaluation
5. **Best Practices**
- Design pattern recommendations
- Code quality improvement
- Testing strategies
## 🔄 Rollback (If Needed)
If you need to revert to Sonnet 4:
```bash
cd claude-vision-mcp
# Update .env
echo "CLAUDE_MODEL=claude-sonnet-4-20250514" >> .env
# Update Cursor config
# Change model=claude-sonnet-4-5-20250929 to model=claude-sonnet-4-20250514
# Restart Docker
docker-compose restart
```
But we recommend staying on 4.5 for best results!
## 📊 Performance Comparison
| Aspect | Sonnet 4 | Sonnet 4.5 |
|--------|----------|------------|
| Reasoning Depth | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Code Quality | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Context Understanding | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Complex Analysis | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Multi-step Planning | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
## ✅ Status
**Everything is updated and working!**
- ✅ Model upgraded to Sonnet 4.5
- ✅ Docker container rebuilt
- ✅ Cursor configuration updated
- ✅ Changes pushed to GitHub
- ✅ Ready to use
**Just restart Cursor IDE and enjoy enhanced AI capabilities!** 🚀
## 📚 References
- [Claude Models Overview](https://docs.claude.com/en/docs/about-claude/models/overview)
- [Anthropic Claude Sonnet 4.5 Announcement](https://www.anthropic.com/news/claude-sonnet-4-5)
- [Claude API Documentation](https://docs.anthropic.com/)
---
**Upgrade completed successfully!** Your MCP server now uses Claude's most intelligent model. 🎊
