Is OpenAI Codex free for AI coding assistants?

No — there's no free plan, but no monthly fee either: you pay for what you use (ChatGPT Go: developers $8 per seat).

How much does OpenAI Codex cost for AI coding assistants?

Codex comes with a ChatGPT plan: Go $8, Plus $20 and Pro from $100 per month, with usage limits and optional credits beyond them. At list prices: developers 1 seat: $8.00/month (ChatGPT Go); developers 1 seat: $8.00/month (ChatGPT Go); developers 1 seat: $8.00/month (ChatGPT Go).

OpenAI Codex pricing

How OpenAI Codex charges, what to know before you commit, and what you'd pay at your usage — next to what the alternatives would cost for the same thing.

How it charges

Checked 2026-10-03 on learn.chatgpt.com ↗ · USD, list prices

In short

Codex comes with a ChatGPT plan: Go $8, Plus $20 and Pro from $100 per month, with usage limits and optional credits beyond them.

Free plan: Yes
Side project: $8.00/mo ChatGPT Go
Growing: $8.00/mo ChatGPT Go
Scaling: $8.00/mo ChatGPT Go

What the model leaves out

Codex comes with a ChatGPT plan. Go covers lightweight tasks on GPT-6 Luna in the desktop app only, and Plus adds the web, CLI and IDE extension. Pro also comes at $200 and $500/month with higher limits. Business is $25 per user per month billed monthly. Codex can also run on an API key at token prices.

Before you commit

Plus and Business have five-hour limits that depend on the model (OpenAI estimates 15–160 local messages per five hours on GPT-6.1 Sol), and weekly limits may also apply; Pro currently has no five-hour limit.
Cloud tasks, Fast mode (2.5x) and image generation use up the allowance faster than standard local messages.
Past the limit, Plus and Pro users can buy ChatGPT credits or run local chats on an API key at API rates.
Go and Free run only GPT-6 Luna in the desktop app; the web, CLI and IDE extension need Plus or higher.