The AI SDKs we reach for in 2026, and when
OpenAI, Anthropic, the Vercel AI SDK, and OpenRouter each solve a different shape of AI project. Here's how we actually choose between them on client work.
AI agents
Agent SDKs, voice agents, and the parts an agent is made of.
AI agent developmentOpenAI Agents SDK vs Claude Agent SDK: a closer look
Both SDKs run an agent loop, but they're built around different problems. One coordinates and hands off between agents. The other hands you Claude Code's own execution harness as a library.
What a realtime voice agent actually consists of
A booking or intake line is five separate pieces, transport, model, tool calls, guardrails, and a handoff path, and each one is a real decision.
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