Claude Agent SDK vs OpenAI Codex
Claude Agent SDK Anthropic
The agent loop behind Claude Code as a TypeScript and Python library, with tools, skills, MCP and subagents.
VisitOpenAI Codex OpenAI
OpenAI’s coding agent, in ChatGPT, a terminal CLI and IDE extensions, that works on tasks in the cloud or locally.
VisitSide by side
| Property | Claude Agent SDK | OpenAI Codex |
|---|---|---|
| Type | Product | Product |
| Category | AI agents and automation | AI coding tools |
| Made by | Anthropic | OpenAI |
| Pricing | Pay per use | Paid |
| Open source | No | Yes |
| API | Yes | Yes |
| Platforms | API | Terminal, IDE, Web |
| Startup | Yes | Yes |
Features
Only Claude Agent SDK
- agent framework
- skills
- multi-agent
Both
- mcp
Only OpenAI Codex
- coding agent
- terminal
- autonomous
- code review