OpenAI Codex Review

Codex is not a separate purchase. It rides inside whichever ChatGPT plan you already hold, so the real decision is which tier gives you enough Codex usage for the week you actually work, not whether to buy a new tool.

OpenAI does not publish a fixed message count for any tier, because a one-line fix and a repository migration draw down the allowance at very different rates.

Toolradar data: the September 2026 AI coding ranking evaluated 153 tools, and Codex sits alongside Claude Code and Cursor in that directory. The closer, head-to-head numbers below are checked against each vendor directly.

How we compared: pricing and product pages for OpenAI Codex, Claude Code, Cursor, GitHub Copilot, and Antigravity CLI, read on September 25, 2026, in USD. A pricing-only breakdown of Codex's closest rival lives at Claude Code pricing.

OpenAI Codex is OpenAI's coding agent, reachable from the ChatGPT desktop app, the web, a command-line tool, an IDE extension, and iOS. It reads a repository, edits files, runs commands in a sandbox, and can open a pull request, so the work happens against the codebase you already have open rather than in a separate chat window. OpenAI was founded in December 2015 and is headquartered in San Francisco.

Every ChatGPT tier from Free through Enterprise gets some access: the two cheapest tiers run on GPT-6 Luna at standard speed, while the two priciest personal tiers add GPT-6 Sol for heavier reasoning tasks. A worktree system lets several agent sessions run in parallel on the same repo, and cloud environments keep a task going after the laptop closes.

Skills let a team encode a repeatable workflow, such as a pull-request review checklist, so Codex applies it the same way every time instead of being re-explained each session.

Background automation covers issue triage, CI monitoring, and alert response on a schedule, which is the part that turns Codex from a chat helper into something closer to a junior teammate with recurring duties.

An API key runs the CLI outside any ChatGPT plan, billed at standard token rates, but that path drops the cloud features: no automatic GitHub review, no Slack integration. Business and Enterprise workspaces add SAML SSO, SCIM, and audit logs, none of which sit on a personal seat below them.

Install the CLI or the IDE extension, sign in with your ChatGPT account, and describe the change in plain language. Codex searches the repository, edits the files it needs, and can run your existing test suite, so the check that gates the change is the one your team already trusts.

Tag @Codex on a GitHub pull request and it reviews the diff without you opening a terminal at all.

Usage resets locally over a five-hour window, and OpenAI's own dashboard shows estimated local messages per period rather than a hard count: entry-level paid users see roughly 5 to 45 GPT-6 Astra turns or 350 to 3,000 GPT-6 Luna turns per window, and the two Pro tiers scale that range up by five and twenty times respectively.

Model choice, context size, and tool use all change how fast a session burns the allowance, so prompt length alone will not predict your week.

When you hit the ceiling mid-task, Codex finishes the turn you are already on under a fair-use allowance, then paid personal users can buy extra credits rather than being forced to upgrade a plan outright. Business and Enterprise workspaces on flexible pricing draw down shared workspace credits instead of a fixed per-seat cap.

For the review-focused half of that workflow, the AI code review list is the narrower buy, and how to use Claude Code is the closest terminal-agent setup guide for comparison.

Codex, Claude Code, Cursor, GitHub Copilot, and Antigravity CLI each bundle their agent into a broader subscription rather than selling it alone, so the comparison below is which host plan gives you enough coding usage for the least money.

Codex Free and Go run on the lightest model tier; Plus is the first level with the CLI, IDE extension, cloud review, and Slack together, and Pro starts at five times that Plus allowance, or four times that again on the top tier.

OpenAI paused new sign-ups and upgrades to that top Pro tier on September 10, 2026, so anyone who needs that ceiling today has to already hold it or wait for the pause to lift, per OpenAI's help center.

Claude Code carries no price of its own either. Annual Pro is $17/mo with Claude Code included, undercutting Codex Plus for a broadly similar single seat, though Claude's monthly Pro rate matches Codex Plus exactly.

Claude's two Max tiers mirror Codex's two Pro tiers almost dollar for dollar, but Anthropic sells no annual discount on either Max tier, where Codex never offered an annual option to begin with. Claude's Team Standard seat matches Codex Business on the annual per-seat rate, and Team Premium runs five times that, both capped per person rather than pooled.

Cursor is the one tool here priced as its own product rather than folded into a chat plan. Hobby is free with limited agent requests, Pro matches the entry rate that Codex and Claude share, and Anysphere recommends Pro+ for daily agent use, a middle tier neither Codex nor Claude Code offers at that exact price point.

Ultra tops out at the same ceiling as the higher Pro-style tiers above, and Teams runs a flat $40/user/mo regardless of Standard or Premium seat type.

GitHub Copilot is the cheapest paid entry of the five: Pro includes 1,500 AI credits worth $15 at the standard per-credit rate, Pro+ is $39/mo with 7,000 credits, and the top individual tier matches the mid-range Pro figure shared by Codex, Claude, and Cursor, but with 20,000 credits included.

Business seats run about half the Pro+ rate per user, and Enterprise costs roughly double Business, both cheaper per seat than Claude's Team Premium or Cursor's Teams plan. Inline completions stay outside the credit meter on every paid Copilot tier, which none of the four chat-first agents here separate out from their general usage pool.

Google moved free and consumer users from Gemini CLI to Antigravity CLI on June 18, 2026, and Antigravity is the only tool here with a real free tier of its own: the $0 individual plan includes Gemini Flash models, Claude Sonnet and Opus, unlimited Tab completions and basic weekly rate limits.

Raising those limits runs through a Google AI subscription rather than a developer-specific plan: Google AI Pro is $19.99/mo, and Google AI Ultra is $99.99/mo, with a $199.99/mo tier for the highest usage.

Organizations reach Antigravity through Google Cloud with consumption-based pricing, so there is no simple seat price to quote against the other four tools.

Codex fits a developer who already pays for ChatGPT and wants that subscription to cover an agent instead of adding a second bill. Plus is the practical entry for a few focused coding sessions a week, and the next Pro tier up is the move once a single evening of migration work burns through that allowance before you are done.

Teams already inside a ChatGPT Business workspace get SSO and admin controls without standing up separate billing for the coding agent.

It is a weaker default when the daily habit is unlimited Tab-style autocomplete, since GitHub Copilot keeps completions off its credit meter on every paid plan, and Cursor bundles unlimited completions into an editor built around that workflow.

GitHub Copilot is the cheaper seat if IDE completions matter more than a terminal agent, and Cursor is the pick when the editor itself should be AI-native rather than a plugin bolted onto VS Code.

Skip a personal seat on Codex's highest tier if that is the one you actually need right now. It has taken no new sign-ups or upgrades since September 10, 2026, so anyone starting from scratch is limited to the lower Pro tier until OpenAI lifts that pause.

Anyone who wants the largest free allowance before paying anything should start on Antigravity's free tier instead, then compare the paid tiers here once its weekly limits start to bind.

Devshot covers pauses like this one as they happen. Subscribe free for the next plan or usage change across these five tools.