HELICONE

Langfuse vs Braintrust vs Helicone: Choosing an LLM Observability Stack in 2026

A fair, sourced comparison of the three LLM observability platforms teams reach for once agents hit production: Langfuse's open-source tracing and prompt management, Braintrust's eval-first workflow for regressions, and Helicone's drop-in proxy for logging and cost control. Architecture, pricing model, self-hosting, and which to pick by workload.