Pydantic Logfire
An observability platform developed by the Pydantic team that provides a unified view of LLM and application trace data, with support for integration into the Python ecosystem.
Timeline (last 90 days)
The article compared 12 AI agent observability and evaluation tools, including BotGauge, Braintrust, Confident AI, LangSmith, Langfuse, Arize Phoenix, Galileo, LangWatch, Pydantic Logfire, Latitude, Datadog LLM Observability, and Fiddler.
Braintrust pricing starts free, with the Pro version at $249/month; Confident AI starts free, with the Starter version at $200/month; LangSmith starts free, with the Plus version at $39/seat/month; Langfuse is free, with paid versions starting at $29/month; Arize Phoenix is free, with the cloud version starting at $50/month; Galileo is free, with the Pro version starting at $100/month; LangWatch is free, with paid versions starting at €29/seat/month; Pydantic Logfire is free, with the Team version starting at $49/month; Latitude is free, with the Pro version at $99/month; Datadog LLM Observability is billed by usage; Fiddler is custom-quoted.
Pydantic Logfire puts HTTP requests, agent loops, model calls and database queries into the same OpenTelemetry trace, queryable with SQL; for evaluation it relies more on custom scoring criteria than on built-in metrics.
All Facts (3)
The article compared 12 AI agent observability and evaluation tools, including BotGauge, Braintrust, Confident AI, LangSmith, Langfuse, Arize Phoenix, Galileo, LangWatch, Pydantic Logfire, Latitude, Datadog LLM Observability, and Fiddler.
50%UnverifiedBraintrust pricing starts free, with the Pro version at $249/month; Confident AI starts free, with the Starter version at $200/month; LangSmith starts free, with the Plus version at $39/seat/month; Langfuse is free, with paid versions starting at $29/month; Arize Phoenix is free, with the cloud version starting at $50/month; Galileo is free, with the Pro version starting at $100/month; LangWatch is free, with paid versions starting at €29/seat/month; Pydantic Logfire is free, with the Team version starting at $49/month; Latitude is free, with the Pro version at $99/month; Datadog LLM Observability is billed by usage; Fiddler is custom-quoted.
50%UnverifiedPydantic Logfire puts HTTP requests, agent loops, model calls and database queries into the same OpenTelemetry trace, queryable with SQL; for evaluation it relies more on custom scoring criteria than on built-in metrics.
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