Claude API
Best for: Coding and agentic apps
Anthropic's models by API, strong at coding, long documents and tool use. Prompt caching cuts repeat costs.
Visit Claude API ↗Home / Use case
Build your own AI agent
“I want an agent that uses tools and runs multi-step tasks.”
SDKs and frameworks for tool-using agents. Prefer the thinnest one that does the job.
Tools for this
OpenAI API
Best for: Broadest multimodal menu
GPT models plus image, speech and realtime voice APIs under one key.
Visit OpenAI API ↗Claude Agent SDK
Best for: Production-grade agents
The harness behind Claude Code, packaged for your own agents: tools, files, subagents and permissions included.
Visit Claude Agent SDK ↗Vercel AI SDK
Best for: AI features in TypeScript apps
A TypeScript toolkit for streaming chat UIs and tool calls across providers. Natural fit for Next.js apps.
Visit Vercel AI SDK ↗LangGraph
Best for: Complex stateful agents
Model your agent as a graph of steps with state and checkpoints. Worth it for long, branching workflows.
Visit LangGraph ↗