LangChain
langchain.com
LangChain and LangGraph for building agents
Alternatives to LangChain
OpenAI API
platform.openai.com
GPT models, Realtime and Agents SDK for developers
Claude API
anthropic.com
Claude models, tool use and agent building blocks
Hugging Face
huggingface.co
Hub for open models, datasets and Spaces
Google AI Studio
aistudio.google.com
Prototype with Gemini models for free
xAI API
x.ai
Grok models via API
DeepSeek Platform
platform.deepseek.com
Low-cost API for DeepSeek models