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Helicone is an AI Gateway and LLM observability platform that lets developers route, monitor, and debug AI applications across 100+ models with a single API key. It provides real-time cost and latency tracking, prompt management, agent tracing, and one-line integration with OpenAI, Anthropic, and other major providers. It's backed by Y Combinator and used by fast-growing AI companies to build more reliable AI products.
Why it made the leaderboard
If you're building LLM-powered applications and need to understand what's actually happening in production — costs, latency, failed requests, prompt regressions — Helicone gives you full observability with a single baseURL swap, no SDK refactoring required. The combination of an AI gateway (100+ model support, automatic fallbacks) with deep observability in one self-hostable package is rare and saves teams from stitching together multiple tools.
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