Compare

AutoGen (AG2) vs PydanticAI

PydanticAI scores higher on the AgentReady, 79/100 against 53/100. They differ on 14 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

AutoGen (AG2). AG2 (formerly AutoGen) is an open-source multi-agent AI framework and AgentOS for building, orchestrating, and evolving systems of AI agents.

PydanticAI. PydanticAI is the batteries-included type-safe framework for building production AI agents in Python.

Where AutoGen (AG2) is ahead

AutoGen (AG2) passes agent-compatible signup flow and copyable quickstart, and PydanticAI does not. That is adopt, whether an agent can get a key and make its first successful call without a human in the loop.

It also holds operate: observable execution. PydanticAI misses it.

Where PydanticAI is ahead

PydanticAI passes structured api reference, openapi / spec quality, response examples provided, errors and status codes documented and limits / constraints documented, and AutoGen (AG2) does not. That is understand, whether an agent can read the docs and work out how the API behaves before calling it.

It also holds adopt: self-service signup and no mandatory sales call. AutoGen (AG2) misses those.

And on operate, structured, predictable output, machine-readable errors, idempotency support and rate-limit behavior predictable. AutoGen (AG2) misses those.

What neither does

Both fail authentication documented, request examples provided, programmatic credential creation, fast time to first request, cli available, retry behavior documented, agent compatibility verified. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. PydanticAI leads 85 to 23. AutoGen (AG2) misses structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; PydanticAI misses authentication documented, request examples provided.

Adopt. PydanticAI leads 65 to 55. AutoGen (AG2) misses self-service signup, no mandatory sales call, programmatic credential creation, fast time to first request, cli available; PydanticAI misses agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart, cli available.

Operate. PydanticAI leads 65 to 35. AutoGen (AG2) misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; PydanticAI misses retry behavior documented, observable execution, agent compatibility verified.

Pricing

AutoGen (AG2) does not publish a machine-readable starting price and has a free tier. PydanticAI starts at $0/mo and has a free tier.

Signal by signal

Which to pick

PydanticAI clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: AutoGen (AG2) and PydanticAI. Alternatives to each: AutoGen (AG2), PydanticAI.

An agent can fetch this as data: POST /v1/compare {"slugs": ["ag2", "pydantic"]}