PydanticAI Model Integration Provider Model Strings Format: Model Settings Fallback Models Chain models for resilience: Streaming Responses Streaming with Structured Output Dynamic Model Selection Deferred Model Checking Delay model validation for testing: Usage Tracking Usage Limits Provider-Specific Features OpenAI Anthropic Common Model Patterns | Use Case | Recommendation | |----------|---------------| | General purpose | or | | Fast/cheap | or | | Long context | (200k) or | | Reasoning | | | Cost-sensitive prod | with fast model first | Check gates before ship Use these only where they p…