Experiential

Experiential is an open-source gateway and router for agent workflows. It exposes hosted, bring-your-own-key, local, and custom models through OpenAI-compatible and Anthropic Messages APIs, with model aliases, access controls, use-case restrictions, and spending limits for users and agents.

The local gateway runs through the `exp` CLI and serves API routes on loopback; its Python interface can load a fitted project router as an OpenAI client. The project can collect OpenTelemetry traces from agent traffic, build a simulation from those traces, and optimize a router for quality, speed, and cost. It also supports fine-tuning an owned open-source model using Tinker.

A hosted gateway is available at `api.experientiallabs.ai`, while local setup persists provider connections and configuration. Anonymous aggregate PostHog telemetry is enabled by default and can be disabled locally; the README states that it excludes prompts, traces, actions, observations, paths, model names, credentials, and raw customer content.