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
- DSPyStable
Stanford framework for programming (not prompting) LMs
- GuidanceExperimental
Microsoft's constrained generation library for structured LLM output
- HaystackStable
Deepset open-source NLP framework for production LLM pipelines
- InstructorProduction
Structured outputs from LLMs using Pydantic schemas
- LMQLExperimental
Query language for LLMs — SQL-like syntax for constrained generation
- LangChainProduction
Composable LLM application framework — chains, agents, RAG

