OpenAI Codex

Coding agent (cloud + CLI) · OpenAI

Verdict: Good if you already pay for ChatGPT; the Plus tier is framed for a few sessions a week, so daily heavy use points to Pro.

Pricing (as published): Free $0; Go $8/mo; Plus $20/mo; Pro plans at $100, $200 or $500/mo (official pricing page).
Limits: Free: quick coding tasks; Go: lightweight tasks; Plus: 'a few focused coding sessions each week'. Precise quotas: not published on the fetched official page.
Compatibility: CLI, IDE extension, cloud tasks, ChatGPT.
Stacks: terminal, vscode, web, github
Open source: no

Official source: https://developers.openai.com/codex/pricing · verified 2026-10-16. Based on official docs, not hands-on tested.