Claude Agent SDK vs Pydantic AI

Pick two tools from the same category to compare side-by-side.

	Claude Agent SDK Anthropic's official SDK for building production agents on Claude.	Pydantic AI Type-safe Python agent framework built by the Pydantic team around validated structured outputs.
Category	framework	framework
Vendor type	commercial	open source
Pricing	free	free
Strengths	+ First-class Claude features (prompt caching, extended thinking) + Designed around production agent patterns + Compatible with the Skills standard	+ Strong type safety and validated structured outputs + Familiar, ergonomic API for Pydantic users + Model-agnostic with broad provider support + Native OpenTelemetry/Logfire observability
Tradeoffs	− Claude-only (cross-provider needs a gateway like Portkey)	− Younger framework with a smaller ecosystem than incumbents − Fewer built-in high-level multi-agent orchestration abstractions − APIs still maturing
Used in stacks	9	0