At Ray Summit 2023, Anyscale Endpoints debuted with a promise of enabling fast, cost-efficient, and scalable integration of large language models (LLMs) into applications using popular LLM APIs. Arize AI is a launch partner, providing developers with LLM observability across various use cases on any cloud as their AI applications evolve. The service integrates with LangChain, allowing users to fine-tune and deploy powerful open-source LLMs at scale. Users can log LLM responses and metadata into Arize, enabling better evaluation and troubleshooting of LLMs in real-world environments, which is particularly important as the open source LLM ecosystem expands.