Comparison

OpenAI Agents SDK vs Pydantic AI

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

OpenAI Agents SDK

OpenAI's lightweight agents SDK (Swarm successor).

+ Minimal and readable abstraction
+ First-class OpenAI tracing and guardrails
− OpenAI models first
− Young ecosystem

Pydantic AI

Type-safe agent framework from the Pydantic team.

+ Type-safe structured outputs
+ Clean dependency-injection design
− Newer, fewer integrations than LangChain
− Python only

Spec	OpenAI Agents SDK	Pydantic AI
Category	framework	framework
License	MIT	MIT
Open source	Yes	Yes
Self-hostable	Yes	Yes
MCP support	Yes	Yes
Pricing	free	free
Starting price	BYOK usage cost	BYOK usage cost
Models	gpt	claude, gpt, gemini, byok
Languages	python	python
GitHub stars	27.4k	18.0k
Last activity	2026-06-24	2026-06-25