OpenAI Codex by OpenAI is ranked #3 in our best AI Coding Assistants list (October 2026). Cheapest paid on-ramp to a serious coding agent via ChatGPT Go. Pricing: ChatGPT Free (quick tasks) · Go $8/mo · Plus $20/mo · Pro $100/$200/$500/mo · Business $25/seat/mo.
What OpenAI Codex does
Codex runs coding tasks locally (CLI/IDE) or in cloud sandboxes, included with ChatGPT plans. Pro tiers currently have no 5-hour limit.
Best for: ChatGPT users who want a coding agent included
OpenAI Codex pricing
| Plans | ChatGPT Free (quick tasks) · Go $8/mo · Plus $20/mo · Pro $100/$200/$500/mo · Business $25/seat/mo |
|---|---|
| Free tier | Quick tasks on ChatGPT Free |
| Checked | 2026-10-24 · pricing source ↗ |
Prices change often. Confirm on the vendor's site before you buy.
Swelldex verdict
FAQ
How much does OpenAI Codex cost?
ChatGPT Free (quick tasks) · Go $8/mo · Plus $20/mo · Pro $100/$200/$500/mo · Business $25/seat/mo (checked Oct 24, 2026).
Does OpenAI Codex have a free tier?
Yes: Quick tasks on ChatGPT Free.
Who is OpenAI Codex best for?
ChatGPT users who want a coding agent included.
Is OpenAI Codex worth it?
Our verdict: Cheapest paid on-ramp to a serious coding agent via ChatGPT Go. Strong at parallel cloud tasks; limits vary a lot by plan.