llm-integration

Langfuse vs Helicone for LLM observability in 2026: SDK span trees vs one-line proxy plus AI Gateway, pricing, real Claude agent test, and decision tree.

Langfuse rebuilt experiments as a first-class concept on April 13, 2026. Here is what changes for LLM evaluation workflows and how to migrate this week.

Compare LiteLLM, Portkey, Cloudflare AI Gateway, OpenRouter, Helicone, and Kong AI Gateway for production LLM apps in 2026 — pricing, fallbacks, caching, and which one fits your stack.

I instrumented a Claude Sonnet 4.6 + pgvector RAG app across 7 LLM observability platforms — Langfuse, Helicone, Phoenix, Braintrust, Opik, Traceloop, Lunary.