Originally published on NextFuture On April 13, 2026, the Langfuse team shipped an experiments rebuild that promotes experiments to a first-class concept inside the platform. If you ship LLM apps that need versioned evaluations, this is the most consequential Langfuse change of 2026 so far. The Langfuse experiments rebuild moves runs out from under datasets and into their own top-level surface, and it changes how LLM developers structure regression tests, eval pipelines, and prompt comparisons. What changed in the Langfuse experiments rebuild Before April 13, an experiment in Langfuse only existed in the context of a dataset. You opened a dataset, picked the experiments tab, and viewed runs against that fixed input set. That coupling worked for small, hand-curated datasets, but it broke down once teams started running evals against sampled production traces or pushing custom data straight from CI scripts. The rebuild lifts experiments to the same level as Datasets in the Langfuse navigation.…