Codex Free Tier Limits: What You Actually Get Without Paying (2026)

OpenAI Codex does not have a dedicated free tier. As of October 2026, Codex access is bundled into a paid ChatGPT plan (Plus, Pro, Business, Edu, or Enterprise) or billed per-token through the OpenAI API with no ongoing free quota. This matters most for developers deciding whether to prototype with Codex before committing to a subscription or API spend.

• Lowest-cost entry point: ChatGPT Plus at $20/month, which includes limited Codex usage that resets on a rolling window.
• ChatGPT Pro at $200/month unlocks substantially higher Codex usage caps for heavy daily use.
• API access via Codex CLI is pay-as-you-go per token, with no permanent free allowance beyond any trial credit new accounts may receive.

Is there a free tier for OpenAI Codex?

No. OpenAI does not offer an unlimited or standalone free version of Codex. Every path into Codex, whether through the ChatGPT app, the Codex CLI, or an IDE extension, requires either a paid ChatGPT subscription or an API key billed on usage, according to OpenAI's Codex documentation.

What does ChatGPT Plus include for Codex usage?

ChatGPT Plus is the cheapest way to get Codex, bundling a limited amount of agentic coding usage into the $20/month subscription alongside regular ChatGPT access. The exact cap depends on task complexity and model reasoning effort, and OpenAI has adjusted these allowances multiple times since Codex's 2025 launch, so Plus users should expect the limit to be meaningfully smaller than what Pro or Business tiers receive (OpenAI ChatGPT pricing).

Because Plus limits are shared across your ChatGPT chat usage and your Codex tasks, running several long agentic coding sessions in the same day can exhaust your allowance faster than casual chat use alone would.

How do Pro and Business plans change the limits?

ChatGPT Pro ($200/month) and Business/Enterprise plans give significantly higher Codex usage ceilings than Plus, aimed at developers running Codex as a daily driver rather than an occasional assistant. Team and Enterprise plans also pool usage differently across seats, which changes how limits are enforced for multi-developer accounts (OpenAI pricing).

Plan	Monthly cost	Codex access	Best for
ChatGPT Free	$0	No Codex access	Not viable for Codex
ChatGPT Plus	$20	Limited, resets on a rolling window	Occasional/light coding tasks
ChatGPT Pro	$200	Substantially higher caps	Daily, heavy Codex use
Business/Enterprise	Custom	Pooled team usage	Teams running Codex at scale
API (Codex CLI)	Pay-as-you-go	Per-token billing, no free quota	Custom workflows, CI, scripting

Can you use Codex with just an API key?

Yes. Codex CLI can run against the OpenAI API directly instead of a ChatGPT subscription, but this is billed per input/output token at standard API rates rather than through a free allowance. New API accounts have historically received a small trial credit, but this is not a recurring free tier and expires after a limited period, per OpenAI's API rate limits documentation.

API billing also means costs scale directly with how much code context Codex reads and generates, so large repositories or long agentic sessions can get expensive quickly compared to the flat-rate ChatGPT subscription model.

When do Codex usage limits reset?

Codex usage tied to a ChatGPT subscription resets on a recurring window rather than accumulating indefinitely, similar to how other AI coding assistants structure their caps. For a deeper breakdown of exact reset timing and how to track your remaining Codex allowance, see this guide on Codex usage limits and reset time.

How to avoid hitting Codex limits

• Reserve Codex for tasks that genuinely need agentic multi-step reasoning, not quick one-line edits.
• Break large refactors into smaller, scoped tasks instead of one long-running session.
• Track remaining usage proactively rather than discovering a limit mid-task.
• If you're consistently hitting Plus limits, compare the cost of Pro against API pay-as-you-go pricing for your actual usage pattern.

How does Codex compare to other coding tools' free tiers?

Codex is stricter than some competitors on the free side since it has no free tier at all, while tools like Cursor and GitHub Copilot offer limited free plans before requiring payment. If you're evaluating alternatives, see how Cursor's pricing and rate limits compare, or check Claude Pro's usage limits and reset schedule if you're weighing Codex against Claude Code.

Key takeaways

1. OpenAI Codex has no free tier; it requires ChatGPT Plus/Pro/Business or API billing.
2. ChatGPT Plus ($20/month) is the cheapest entry point but has the lowest Codex caps.
3. ChatGPT Pro ($200/month) is built for developers running Codex daily at higher volume.
4. API access via Codex CLI is metered per token with no recurring free allowance.
5. Usage resets on a rolling window for subscription-based Codex access, not a hard monthly reset.

Sources

• https://developers.openai.com/codex
• https://openai.com/chatgpt/pricing
• https://platform.openai.com/docs/guides/rate-limits