What does ChatGPT Codex cost in 2026? Pricing and access options explained

Current Billing (verified July 2026)

Codex is included across the Free, Go, Plus, Pro, Business, and Enterprise plans rather than sold as a standalone product. Two things changed in 2026 that older guides get wrong:

1. The plan lineup changed. A new Go tier ($8/month) sits below Plus, the Team $30/user plan was replaced by Business at $25/user/month (about $20/user/month billed annually, minimum 2 users) on April 2, 2026, and Pro now splits into two usage tiers: $100/month (5x Plus usage) and $200/month (20x Plus usage).
2. The models changed. Codex now runs on the GPT-5 series — GPT-5.5, GPT-5.4, and GPT-5.4 mini — rather than the earlier codex-1 (o3-family) model.

Since April 2, 2026 Codex usage on Plus, Pro, Business, and Enterprise is billed against credit/token consumption rather than per message. Per 1M tokens the credit rates are GPT-5.5 = 125 in / 750 out, GPT-5.4 = 62.50 / 375, and GPT-5.4 mini = 18.75 / 113. Typical real-world usage runs about $100 to $200 per active developer per month, varying with model, parallel instances, and fast mode. (Source: OpenAI Codex pricing, accessed July 2026.)

Plan pricing (as of July 2026)

The Codex CLI remains a free, open-source terminal tool that connects with your own API key; using it that way bills token usage directly through the OpenAI API rather than a subscription.

Access options and cost control

• Subscription (Plus/Pro/Business): Codex draws on a shared usage allowance also used by other agentic ChatGPT features. Plus and Pro users can buy additional credits once they hit the cap.
• API key (unattended automation): billed strictly per token at standard OpenAI API rates, with no ceiling — set a hard budget cap.
• Choosing a tier: individual developers are well served by Plus at $20; heavy agentic users move to Pro (5x at $100 before 20x at $200); small teams that want SSO and no-training guarantees use Business at $25/user.

How it compares

At the entry level Plus ($20/month) is priced with GitHub Copilot Pro ($10/month), Claude Pro ($20/month), and Cursor Pro ($20/month). The distinction is interface and autonomy: Codex runs agentic, sandboxed tasks (including cloud tasks that open pull requests), whereas Copilot and Cursor are IDE-embedded. For unattended or high-volume generation, the API path is usually cheaper per unit of output than any subscription, at the cost of building your own tooling.

Editor's Note: Across ShadowGen engagements using Codex in 2026, the April-2026 switch from per-message to token-based credits changed how we budget it. On one client's migration work, two engineers running parallel Codex sessions against a large codebase exhausted the shared five-hour usage window by early afternoon, because cloud tasks and the local CLI both draw from the same allowance. Re-checked July 2026: the new Go ($8) and Business ($25/user) tiers reshuffled the low end — for a small team that wants SSO and a no-training guarantee, Business is now the sensible floor rather than stacking individual Plus seats. For unattended automation we still use an API key with a hard budget cap, since that path bills real dollars per token with no ceiling. — Rafal Fila, ShadowGen