Vercel AI SDK
TypeScript toolkit for building AI-powered web applications
Verdict
Best framework for AI-powered web apps in the React/Next.js ecosystem. Streaming, tool calling, and generative UI built in. Provider-agnostic with OpenAI, Anthropic, Google support.
Other Frameworks & SDKs
- LangChainProduction
Composable LLM application framework — chains, agents, RAG
- LlamaIndexProduction
Data framework for LLM applications — indexing and retrieval
- DSPyStable
Stanford framework for programming (not prompting) LMs
- HaystackStable
Deepset open-source NLP framework for production LLM pipelines
- Semantic KernelProduction
Microsoft's enterprise SDK for AI apps (.NET, Python, Java)
- InstructorProduction
Structured outputs from LLMs using Pydantic schemas

