Comparison Last updated: October 27, 2026 · Prices and limits checked on vendor pages Oct 27, 2026

Claude Code vs Codex: which $20 plan, which needs fewer fixes, and using both

Claude Pro and ChatGPT Plus both cost $20/month, and both include a coding agent. Here's what each $20 actually buys, what Cursor charges instead, and how to split work between the two.

Quick pick

You already pay for Claude, or want one $20 subscription for chat and coding: Claude Code. Pro includes Claude Code in the terminal, IDE, desktop app and browser, with Opus and Sonnet models. Your chats and your coding share one usage pool.
You want to see how much usage you'll get before you pay, plus cloud tasks and GitHub PR review on the entry plan: Codex. OpenAI publishes estimated message ranges per model for Plus, and Plus includes Codex cloud, automatic code review and the Slack integration.
You hit limits on one and don't want to pay $100: run both for $40. They're separate subscriptions with separate limits. A common split is Claude Code to plan and review, Codex to implement.
You want an AI editor rather than an agent: Cursor has no $20 plan. Plus is $8 (Grok models only) and Premium is $30.

Our daily coding ranking covers editors. This page is about the two terminal-first coding agents. Facts come from claude.com/pricing, Anthropic's help article Use Claude Code with your Pro or Max plan, the Claude Code docs, OpenAI's Codex pricing page, chatgpt.com/pricing and cursor.com/pricing, all read October 27, 2026. Prices are USD before tax and change often, so check the vendor before you buy. No affiliate links on this page.

The $20 plan: usage limits and pricing (checked October 27, 2026)

	Claude Code (Claude Pro)	Codex (ChatGPT Plus)	Cursor (for price comparison)
Price	$20/month, or $17/month billed annually ($200 up front)	$20/month	No $20 plan. Plus is $8/month; Premium is $30/month
Free plan	Claude Free doesn't include Claude Code	Free ($0) and Go ($8/month) get limited Codex: GPT-6 Luna in the desktop app, subject to rollout	Free ($0) with limited agent and chat requests
Models on the $20-ish plan	Opus, Sonnet and Haiku; Fable only through paid usage credits on Pro	GPT-6.1 Sol, GPT-6.1 Terra, GPT-6 Astra, GPT-6 Sol and GPT-6 Luna in Codex	Plus: Grok models only. Premium: third-party models available, billed separately at API list price
Published usage amount	No fixed message count. Pro gives "at least 5x more usage per 5-hour session than Free"	Estimated local messages per 5 hours on Plus: GPT-6 Astra 5–45, GPT-6.1 Sol 15–160, GPT-6.1 Terra 35–285, GPT-6 Luna 350–3,000 (OpenAI says these aren't fixed limits)	Plus: "Basic" usage. Premium: 4x Plus. No unit count published
How limits reset	Rolling 5-hour session window plus a weekly limit	5-hour window; weekly limits may also apply	Usage pool refreshes weekly
What shares the pool	Claude chat on web, desktop and mobile, plus Claude Code in every surface	Codex local messages and cloud tasks, plus ChatGPT Work; cloud tasks may use more per task	Cursor plus Grok (Chat, Imagine, Voice, Bot)
When you hit the limit	Wait for the reset, upgrade, turn on usage credits at standard API rates, or switch to a pay-as-you-go Console account. A response already in progress can finish ("wrapping up"), up to once per weekly period on Pro, rolling out gradually	A turn already in progress can keep going, subject to fair use. Buy ChatGPT credits, or run local chats with an API key at API rates	Buy top-offs or wait for the weekly refresh
Check what's left	Settings > Usage, or `/status` in Claude Code	Usage dashboard, or `/status` in the Codex CLI	Settings
Next tier up	Max 5x or Max 20x, from $100/month (5x or 20x Pro usage per 5-hour session)	Pro at $100, $200 or $500/month; OpenAI says Pro plans currently have no five-hour limit	Super $100/month (15x Plus), Ultra $200/month (50x Plus)

So which $20 plan gives more usage?

Nobody can answer that from the official pages, and anyone quoting an exact number for both is guessing. OpenAI gives ranges. Anthropic gives a multiple of the Free plan. Usage on both depends on the model, how much of your repo the agent reads and how long the session runs. What the pages do tell you:

Codex is more predictable up front. You can see a published range for each model, and dropping to a lighter model (GPT-6 Luna's estimate is about 20x GPT-6.1 Sol's) stretches the plan a long way for routine tasks.
Claude Pro's pool is shared with your chats. If you also use Claude for writing and research every day, that comes out of the same five-hour and weekly limits as your coding.
Both let you pay to keep going without upgrading: Claude usage credits at API rates, or ChatGPT credits on Plus.
Measure your own week. Run your normal work on one plan and watch /status. Both tools show it, and that tells you more than any chart.

Tip from OpenAI's docs that applies to both tools: keep the instructions file short and turn off MCP servers you aren't using. OpenAI says every MCP server adds context to each message and uses more of your limit.

Which needs fewer fixes on a real, messy codebase?

We haven't run a controlled head-to-head on the same messy repo yet, so we won't name a winner or quote a benchmark. Fix rate depends heavily on the model you pick, the context you give it and whether the agent can run your tests. Here's what each tool gives you for messy code, from the vendors' docs:

	Claude Code	Codex
Repo instructions	`CLAUDE.md` read at the start of every session (or an existing `AGENTS.md` instead), plus auto memory it builds as it works	`AGENTS.md`, which can be nested by folder so big repos only load what's relevant
Guardrails that catch mistakes	Hooks run shell commands before or after actions, such as formatting after every edit or linting before a commit	Sandboxing and permission controls, plus auto-review of approval requests
Built-in review	GitHub Code Review on PRs, plus GitHub Actions or GitLab CI for automated review	Local `/review`, plus GitHub code review and automatic PR reviews
Parallel work	Multiple agents, with a lead agent that coordinates; background agents; web sessions in parallel	Subagents, worktrees and built-in Git tools; cloud tasks
Where it runs	Terminal, VS Code (and Cursor or other forks), JetBrains, desktop app, web and mobile	CLI, IDE extension, desktop app, web (Codex cloud) and iOS

Run your own one-hour test

Pick one real bug or small feature in your messiest repo, with a test that currently fails.
Write one short AGENTS.md (build command, test command, folders to avoid). Both tools can read it.
Give each agent the same prompt on a fresh branch, and let it run your tests.
Count how many follow-up prompts you need until the test passes and the diff is something you'd merge. Note how much of your 5-hour limit each one used (/status).

Your own repo is the only benchmark that counts here.

Using both together: Claude to plan and review, Codex to implement

A setup people talk about a lot on X is splitting the job: one agent writes the plan and reviews the diff, the other writes the code. Because Claude Pro and ChatGPT Plus have separate limits, $40/month gets you two pools instead of one, still well under either $100 tier.

One instructions file. Keep your rules in AGENTS.md. Codex reads it, and Claude Code can read it in place of a CLAUDE.md, so both agents follow the same rules.
Plan in Claude Code. Ask for a step-by-step plan and the files it would touch, and save it to a markdown file in the repo.
Implement in Codex. Point Codex at the plan file and have it make the change and run the tests, locally or as a cloud task.
Review in Claude Code. Pipe the diff in (for example git diff main --name-only | claude -p "review these changed files", a pattern from Claude Code's docs) or review the PR, then send fixes back to Codex.

The split also works the other way round. Codex has its own /review and PR review, so you can let Claude Code build and Codex review. Pick whichever direction leaves more headroom on the plan you lean on most.

Choose Claude Code when

You want one $20 subscription that covers Claude chat and a coding agent.
You want hooks that run your formatter, linter or tests around every edit.
You already use Cursor or VS Code and want the agent inside it: the Claude Code extension installs there and uses your Claude plan.

See Claude plans →

Choose Codex when

You want published usage estimates per model, and a cheap, fast model for high-volume routine tasks.
You want cloud tasks, automatic code review and the Slack integration on the $20 plan.
You want a path to more usage with no five-hour limit (ChatGPT Pro, from $100).

See Codex plans →

One privacy note

On Claude's individual plans (Free, Pro, Max), model training is listed as opt-out. In OpenAI's Codex feature table, "no training on API or business data by default" is marked for Business, Enterprise/Edu and API-key use, not for Plus or Pro. If your code is sensitive, check the training setting on whichever plan you choose.

Questions people ask

Which $20 plan gives more usage, Claude Pro or ChatGPT Plus for Codex?

Neither company publishes a number you can compare directly. OpenAI publishes estimated ranges for Codex on Plus, for example 15 to 160 local messages per five hours on GPT-6.1 Sol and 350 to 3,000 on GPT-6 Luna, with weekly limits that may also apply. Anthropic publishes no message count for Claude Pro: it says Pro gives at least 5x the Free plan's usage per five-hour session, adds weekly limits, and shares that pool between Claude chat and Claude Code. Checked October 27, 2026.

How much do Claude Code and Codex cost?

Claude Code comes with Claude Pro at $20/month ($17/month billed annually, $200 up front) and Max from $100/month (5x or 20x Pro usage). Codex comes with ChatGPT Plus at $20/month, and ChatGPT Pro comes in $100, $200 and $500 tiers. Free and Go plans have limited Codex access; Claude Free does not include Claude Code. Prices checked October 27, 2026 on claude.com and developers.openai.com.

Does Cursor have a $20 plan?

No. Cursor's individual plans are Free, Plus at $8/month (Grok models only), Premium at $30/month (4x Plus usage, third-party models billed separately at API list price), Super at $100 and Ultra at $200. Checked October 27, 2026 on cursor.com/pricing.

Which one needs fewer fixes on a messy codebase?

We haven't run a controlled test on the same repo yet, so we won't name a winner. Fix rate depends heavily on the model you pick, the instructions file you give it and whether it can run your tests. Both read a repo instructions file (Claude Code reads CLAUDE.md or AGENTS.md, Codex reads AGENTS.md), and both have a built-in review step.

Can I use Claude Code and Codex together?

Yes. They are separate subscriptions with separate limits, so running both costs $40/month on the entry plans. A common split is Claude Code for planning and review and Codex for implementation. Claude Code can read an AGENTS.md file in place of CLAUDE.md, so one instructions file can serve both tools.