A agentindex
Comparison

Claude Code vs OpenAI Codex

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

Claude Code

Anthropic's agentic CLI coding assistant.

  • + Strong multi-file reasoning and coordinated edits
  • + Sub-agents keep the main context lean
  • − Tied to Claude models only
  • − Can burn tokens re-reading large repos without guidance files

OpenAI Codex

OpenAI's open-source agentic coding CLI.

  • + Open-source CLI
  • + Sandboxed command execution
  • − OpenAI models only
  • − Newer, less battle-tested than incumbents
Spec Claude Code OpenAI Codex
Role Coding agent Coding agent
Tags coding-agent, cli, persona-solo-builder, persona-software-developer, persona-data-scientist coding-agent, cli, persona-solo-builder, persona-software-developer, persona-data-scientist
License Proprietary Apache-2.0
Open source No Yes
Self-hostable No No
MCP support Yes Yes
Pricing freemium usage
Price Bundled Free
Usage cost Included Metered
Models claude gpt
Languages python, typescript, go, rust, multi multi
GitHub stars — 95.4k
Last activity — 2026-07-04