Langfuse is an open source LLM engineering platform. It helps teams collaboratively develop, monitor, evaluate, and debug AI applications. Langfuse can be self-hosted in minutes and is battle-tested. Proudly made with ClickHouse open source database.
Trace OpenAI Codex CLI coding sessions, agent turns, tool calls, token usage, and subagents with Langfuse for comprehensive observability.
🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.
End-to-end Langfuse workshop using a TypeScript Agent to teach the AI engineering loop: tracing, prompt management, monitoring, datasets, experiments, and evaluation.
🪢 Langfuse JS/TS SDKs - Instrument your LLM app and get detailed tracing/observability. Works with any LLM or framework
🪢 Langfuse Python SDK (v4, OpenTelemetry). Tracing: get_client() / start_as_current_observation — not the legacy Langfuse().trace() client.
