Helicone/helicone
Helicone is an open-source LLM observability and AI gateway platform that monitors, evaluates, and routes LLM calls with cost and latency tracking.

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The platform provides one-line integration for LLM call monitoring, enabling developers to track costs, latency, and performance across multiple AI models and frameworks. It serves as an AI gateway providing access to over 100 models with intelligent routing and automatic fallbacks. The platform includes agent tracing, datasets, fine-tuning support, and prompt management tooling for AI engineering workflows.