Codex Review 2026: What OpenAI's Coding Agent Actually Costs (and Where It Loses to Claude Code)

OpenAI's Codex isn't a new product announcement — it's been live for a while, bundled into ChatGPT rather than sold on its own. That bundling is exactly why it's easy to underrate: there's no dedicated landing page shouting about it, so a lot of people paying for ChatGPT Plus don't realize they already have a CLI coding agent, a VS Code/Cursor/Windsurf extension, cloud-hosted long-running tasks, and automatic PR review on GitHub, all included.

We wrote it up the way we write every tool here — pricing and docs pages checked directly (2026-10-26), cross-referenced against the open-source openai/codex repo, no lab benchmark run, and anything the sources don't state (MCP support, a JetBrains integration) left as unverified instead of guessed.

What you actually get:

• Plus, $20/month — CLI, IDE extension, web tasks. Usage is capped per 5-hour window, with the exact message allowance varying by which model you're using.
• Pro, from $100/month ($100/$200/$500 tiers) — removes the 5-hour cap entirely.
• Business, $25/user/month ($20/user annually, 2+ seats) — same per-seat limits as Plus, plus admin controls.
• Free and Go — Codex only, through the ChatGPT desktop app, one model, "subject to rollout."
• API key — skip the subscription, pay OpenAI's per-token rate instead.

The 5-hour window is the detail that matters most if you're deciding between Plus and Pro: OpenAI publishes it as a range per model rather than a fixed number, because the real ceiling depends on task size. Budget for "it varies," not a specific count.

Where it actually stands against the competition:

• vs. Claude Code — the closest match in the whole market. Same shape: CLI, editor extension, desktop app, web, bundled into a subscription instead of metered separately. Which one wins for you comes down to which subscription you already hold and whose usage limits fit your day better, not a capability gap.
• vs. Cursor / Copilot — different category. Codex has no inline autocomplete; plenty of people run it alongside an autocomplete tool rather than instead of one.
• vs. Aider / Cline — those are open source and model-agnostic (bring your own API key, any provider). Codex locks you to OpenAI's models but trades per-token billing for flat plan pricing — a real tradeoff, not a strict downgrade.

Our take: 4/5. If you already pay for ChatGPT Plus, Codex costs you nothing extra and is worth trying before you add a second agent subscription on top. The honest limitations — no autocomplete, OpenAI-only models, a usage cap that only Pro removes, unverified MCP/JetBrains support — are exactly the things we'd want to know before signing up, not after.

Full review with the complete pricing table, strengths/limitations breakdown and "who should use this" guide: https://devtoolsreview.com/reviews/codex-review/

We have no affiliate or commission relationship with OpenAI for Codex — checked 2026-10-26, no program exists to disclose.