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LangStream

A lightweight framework for building LLM applications using streams.

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What is LangStream?

LangStream is a lightweight framework for building LLM applications using streams.

About

LangStream is a streamlined alternative to LangChain, designed for developers building LLM applications. It emphasizes simplicity with a core focus on streams as the primary building block, making it easy to learn and adapt. The framework is fully typed and composable, allowing for the creation of complex applications through the composition of various streams.

Strengths

  • Lightweight and easy to learn compared to alternatives
  • Fully typed for better development experience
  • Highly composable with clear abstractions
  • Supports asynchronous processing natively
  • Facilitates custom prompt engineering

Limitations

  • Limited features compared to more comprehensive frameworks
  • May require additional setup for complex integrations
  • Community and support may be smaller than larger frameworks

Use Cases

Creating chatbots that respond in specific formats (e.g., emojis)Building complex LLM applications through stream compositionImplementing custom prompt engineering for LLMsDebugging and testing LLM outputs with easeConnecting multiple LLMs or processing steps in a single workflow

Integrations

OpenAI APIPython AsyncIOVSCode with PyLance