OpenAI Codex

OpenAI's coding agent (CLI and cloud).

Key facts

• Use case: AI coding IDEs & agents
• TestedTools score: Testing in progress
• Pricing: Included in ChatGPT plans: Free $0; Go $8/mo; Plus $20/mo; Pro $100, $200 or $500/mo; Business $25/user/mo billed monthly; Enterprise custom; or API-key usage at API rates verified (source, checked 2026-10-15)
• Affiliate: unknown

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Alternatives

• Cursor
• Windsurf
• Claude Code
• GitHub Copilot
• Cline
• Aider
• Zed
• OpenCode
• Pi

Building a tool like this? Fast-Track Review gets it tested sooner (paid, does not change its score).