Dynamic model selection and provider switching

Build an abstraction layer so application code does not depend directly on one FM.

This enables:

• model switching
• provider switching
• A/B testing
• cost optimization
• fallback
• gradual migration

Use a model router:

Application
    ↓
Model Abstraction / Router
    ├── Model A
    ├── Model B
    └── Model C

Configuration controls the selected model:

AppConfig
   ↓
Model Routing Configuration
   ↓
Lambda / Application
   ↓
Bedrock / Provider

• AWS Lambda
• Amazon API Gateway
• AWS AppConfig
• Amazon Bedrock

Use when model choice may change without application-code changes.

Do not hard-code model-specific logic throughout the application if dynamic switching is a requirement.

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