Alternatives to Vercel AI SDK

Open-source Python library for guaranteed valid structured outputs from LLMs

An open-source Python library for steering LLMs with native control flow, regex, and CFG constraints.

Google's open-source framework for building agentic AI apps in JS, Go, Python & Dart.

Open-source streaming-first toolkit that turns AI agent output into interactive UI, not JSON.

Open-source Swift package wrapping the OpenAI API with async/await and Combine.

GoAI SDK: one unified Go API across 25+ LLM providers with streaming, structured output, MCP support.

Free GitHub repo of OpenAI API code examples, guides, and Jupyter notebooks.

Open-source MCP testing & app framework for building ChatGPT Apps and Claude Connectors.

Extra-small OpenAI-compatible AI SDK for JS — 40x smaller installs.

Open-source AI agent SDK for production-grade Python & TypeScript agents

Open-source Java library for building LLM-powered apps with a unified API

Open-source LLM that turns natural language into API calls for tool-using agents

Open-source framework for building private, on-premise RAG applications with 100% local data control.

Compress AI agent context by 60–90% with a local, open-source MCP server.

Run LLMs in-browser with WebGPU — headless React hooks, just useLLM().

Build AI agents on small language models—run locally or via any OpenAI-compatible server.

LMQL is a programming language for LLM interaction with typed constraints, nested queries, and multi-backend portability.

Ruby gem for streaming open source LLMs via Ollama locally

React frontend stack for building agentic user experiences with generative UI

An open-source Python framework that turns ordinary functions into AI-powered tools via simple decorators.

Predibase by Rubrik: Fine-tune and serve open-source LLMs on managed infrastructure.

A type-safe programming language for building AI agents with compile-time guarantees on structured outputs.

Open-source Python framework turning messy text into typed, queryable Semantic DataFrames

TypeScript SDK to build AI agents with composable middleware and full control.

Fast Java tokenizer library for OpenAI GPT models using BPE

Open-source Rust CLI that filters command output before it hits your LLM

Open-source React chat UI components for LLM interfaces

Open-source tool for comparing chain-of-thought reasoning traces across AI backends

Fast, open-source tokenization library for training custom vocabularies with BPE, WordPiece, Unigram.

Open-source Django library for adding AI assistants, chatbots, and RAG to your projects.