Claude vs OpenAI Agents SDK

The OpenAI Agents SDK is a developer-first framework: you write Python code to define agents, handoffs, guardrails, and human-in-the-loop checks. It supports containerized Sandbox Agents for long-running tasks like code review, and Realtime Agents built on gpt-realtime-2.1 for low-latency voice. It's provider-agnostic via LiteLLM (100+ models) and can use MCP tools. Claude, by contrast, is a packaged assistant: it handles long documents (PDFs, design files), gives structured output (JSON, XML), and includes specialized tools like Claude Code (now with artifacts), Claude Design (design-to-code), Claude Tag in Slack, and Claude Science. Claude also has voice mode and memory across conversations. The SDK doesn't offer these out-of-the-box tools—you'd build them. Claude is stronger for zero-setup productivity; the SDK is stronger for custom orchestration, especially if you want to mix models or embed agents in your own app.

The OpenAI Agents SDK is MIT-licensed and free—you pay only for API usage from OpenAI or whichever LLM you connect via LiteLLM. There are no subscription tiers. Claude is freemium: the Free tier allows limited access (including limited web search), while paid plans (Pro, etc.) unlock higher usage limits and priority access. The recent Claude Opus 5 launch undercuts the previous cost barrier: it delivers near-Fable 5 performance at roughly half the cost, so high-intelligence tasks are more affordable on Claude than before. For a solo developer experimenting with agents, the SDK has zero upfront cost. For a business needing managed, reliable assistant features, Claude's subscription is likely worth it despite the API costs (if used heavily).