NewsletterBlogLearnCompareTopicsGlossary

How Much Does OpenAI Codex Cost?

OpenAI Codex pricing: free tier for students and open source maintainers, Pro access for paid subscribers. Here's what each tier includes.

tools
ShareXLinkedIn

How Much Does OpenAI Codex Cost?

OpenAI Codex offers a tiered pricing structure: free credits for students and open source maintainers, and paid access for general users. Students receive $100 in free credits through OpenAI's education program, while open source maintainers get free Pro-level access. Beyond these programs, Codex access is tied to OpenAI's broader API and ChatGPT subscription tiers.

Context

Codex pricing has evolved significantly from its origins as a standalone API. The current Codex CLI — OpenAI's agentic coding tool for the terminal — runs on the same underlying models as ChatGPT and the OpenAI API, which means pricing depends on how you access it.

There are three distinct access paths:

Free credits for students: OpenAI's student program grants $100 in free credits. The Codex for Students offer comes with real caveats — the credits are time-limited and subject to usage rate limits. This is enough to explore the tool, but not sufficient for sustained daily use on large codebases.

Free Pro access for open source maintainers: OpenAI launched a dedicated program giving qualifying open source maintainers free access to Codex Pro tools. The criteria center on active public repositories with real user adoption — hobbyist projects don't automatically qualify.

Standard API billing for everyone else: Codex CLI uses OpenAI's API under the hood, which means token-based billing at standard API rates. The costs scale with how much context you send per task — large codebases with long file reads can accumulate token usage quickly. See the complete Codex guide for a breakdown of how the tool processes requests.

If you're comparing this against alternatives, Anthropic's Claude Code uses similar API-based billing. Both tools reward users who keep tasks focused and context tight to manage costs.

Practical Steps

  1. Students: Apply through OpenAI's education portal to claim the $100 credit. Check the real caveats before assuming this covers production use.
  2. Open source maintainers: Apply for free Pro access via OpenAI's open source program. Have your repository stats ready — stars, contributors, and download metrics.
  3. General users: Start with the Codex CLI guide to understand typical session costs before committing. Use the --dry-run flag where available to preview what a task will do before burning tokens.
  4. VS Code users: The Codex VS Code extension may have different billing behavior than the CLI — check the extension's documentation for token usage details.

Want more AI insights? Subscribe to LoreAI for daily briefings.