TL;DR — For us, Logfire was by far the best option.
We needed observability for production AI agents in regulated industries. After evaluating the landscape, we went with Pydantic Logfire over Braintrust. We didn't even look at LangSmith after our LangChain experience.
Here's why Logfire won.
We used LangChain and LangGraph for about eight months. They got us to our first production deployment. And then we ripped them out and rewrote everything in Pydantic AI.
Here's why.
I'm Jim—French, originally from Paris, now in San Francisco chasing the startup dream. I work at a fast-growing AI startup here. Can't name the company—you know how it is—but I can tell you what we're building: sales and back-office AI automation for highly regulated businesses.