TanStack AI is a new open-source SDK in alpha that provides multi-provider AI integration with support for OpenAI, Anthropic, Gemini, and Ollama. It offers a unified API across providers, supports multiple client frameworks (React, Solid, vanilla TypeScript) and server-side languages (TypeScript, PHP, Python), and includes features like automatic tool calling and TanStack DevTools integration. The SDK aims to compete with Vercel's AI SDK by offering broader language support and framework flexibility.