Codex

OpenAI's software engineering agent

openai.com · Free tier; Go $8/mo; Plus $20/mo; Pro 5x $100/mo; Pro 20x $200/mo; API pay-as-you-go available

What it is

Codex is OpenAI's coding agent — it runs tasks in the cloud or your terminal, works through issues, writes PRs, and can operate autonomously on a repo.

Why it's good for vibe coding

Strong at running longer autonomous tasks and turning issues into working pull requests while you do something else.

Capabilities

  • OpenAI coding agent: cloud tasks + terminal CLI; turns issues into PRs, runs autonomously in sandboxed envs
  • Integrates with GitHub: reads repos, opens pull requests, responds to review comments
  • Pricing: included with ChatGPT Plus/Pro subscriptions
  • Best for: fire-and-forget tasks and PR-based workflows on an existing repo
  • Not for: local-first interactive building (CLI exists but terminal UX is secondary)