AI Coding Agent Extension Guide
Compare the Claude Code and ChatGPT / Codex ecosystems
Claude Code
Anthropic
🗺️
Interactive Cheatsheet
📖
Concepts
Docs
·
GitHub
·
MCP Spec
ChatGPT / Codex
OpenAI
🗺️
Interactive Cheatsheet
📖
Concepts
Codex Docs
·
GitHub
·
ChatGPT
📅
Evolution Timeline
When each extension type was first released — Jun 2023 to Mar 2026
