Does Codex only run in the terminal?

No. Codex is listed across web, mac, win, linux, cli, and a VS Code extension, plus a cloud surface for code review on GitHub PRs.

Does CodeRabbit work on GitLab and Bitbucket?

Yes. It supports GitHub, GitLab, Bitbucket, and Azure DevOps.

What models does Codex use?

OpenAI's GPT models only — GPT-5.5 is listed as the recommended frontier model. Claude and Gemini are not available out of the box.

Is there a free option for either?

Codex has a Free plan at $0 /month. CodeRabbit has a free tier for open-source repositories; the price for that tier is not on file.

Do both review GitHub pull requests?

Yes, but differently. Codex spins up a cloud code review on a GitHub PR that comments inline and proposes fixes. CodeRabbit posts inline review comments on every PR as a bot.

CodeRabbit vs Codex: How They Actually Differ

Pick Codex if you want a single agent that runs across terminal, IDE, desktop, and cloud and you're already on ChatGPT plans. Pick CodeRabbit if you want line-level pull-request review comments across GitHub, GitLab, Bitbucket, and Azure DevOps, especially for open-source work.

Compiled 2026-08-25 from our catalogue entries for CodeRabbit and Codex.

The short answer

Pick Codex if: You want one coding agent that moves between CLI, IDE extension, desktop, and cloud, with ChatGPT plan bundling from the free tier up through Pro.
Pick CodeRabbit if: You want automated, inline review comments on every pull request across GitHub, GitLab, Bitbucket, and Azure DevOps, with a free tier for open-source repositories.
Cheapest way in: Codex Free at $0 /month; CodeRabbit's free tier for open-source repositories (price not on file), or Pro from $24 /mo/user, billed annually.
What we could not compare: Public repos, docs, and enterprise pricing for Codex; the exact CodeRabbit free-tier terms and the credit rate for Unrestricted CLI and PR Reviews.

Both products sit in the AI Coding Agents category, but they solve different jobs. Codex is OpenAI's coding agent, built to stay with you across terminal, IDE, desktop, and cloud surfaces, and to spin up a cloud code review on a GitHub pull request when you ask. CodeRabbit is a pull-request review bot whose whole job is posting inline comments on every PR you open.

Codex is the right shape when you want one agent across many surfaces and you're already paying for ChatGPT. CodeRabbit is the right shape when your review process needs to work across mixed Git hosts, including open-source repos, and you want line-level comments instead of file-level summaries.

Side by side

Every cell is a field on our catalogue entry for that tool, copied as recorded. Rows where the two differ come first; blank fields say so rather than being filled in.

	CodeRabbit	Codex
Starts at	Pro — $24 /mo/user, billed annually	Free — $0 /month
Runs on	web, cli	web, mac, win, linux, cli, vscode-ext
Category	AI Coding Agents	AI Coding Agents
Pricing model	Freemium	Freemium
Public source code	No public repo listed	No public repo listed
Public docs	Not listed	Not listed

Public source code: From the repository link on each catalogue entry, not a licence audit.

What each one costs

Headline plans copied from our own verified pricing pages — CodeRabbit read 2026-08-25, Codex read 2026-08-21. Follow either link below for the full tier breakdown and its source.

	CodeRabbit	Codex
Entry plan	Pro — $24 /mo/user, billed annually	Free — $0 /month
Plan 2	Pro Plus — $48 /mo/user, billed annually	Go — $8 /month
Plan 3	Enterprise — Talk to us	Plus — $20 /month
Plan 4	CodeRabbit Security — $40 /mo/user	Pro 5x — $100 /month
Plan 5	CodeRabbit Agent for Slack — $0.50 per agent minute	Pro 20x — $200 /month

Where CodeRabbit is the better fit

Posts contextual review comments tied to specific diff lines, not just file-level summaries.
Supports GitHub, GitLab, Bitbucket, and Azure DevOps, so review follows you across Git hosts.
Free tier for open-source repositories, plus an Unrestricted CLI and PR Reviews option sold by credits.

Full CodeRabbit entry · CodeRabbit pricing, verified

Where Codex is the better fit

One agent that runs across CLI, IDE extension, desktop app, and cloud, so work started in one surface can continue in another.
Cloud code review on a GitHub pull request that catches bugs and proposes fixes inline.
Reads the shared AGENTS.md instructions standard and supports MCP tools.
Included with ChatGPT plans from the free tier up through Pro.

Full Codex entry · Codex pricing, verified

Which one should you pick?

Solo founder already on ChatGPT who wants one agent everywhere

Codex

It covers CLI, IDE, desktop, and cloud, starts at $0 /month, and is included with ChatGPT plans from Free up through Pro.

Small team with repos on more than one Git host

CodeRabbit

It posts inline review comments on every PR across GitHub, GitLab, Bitbucket, and Azure DevOps, which matters when the team isn't all on GitHub.

Open-source maintainer running a public repo

CodeRabbit

It has a free tier for open-source repositories, so line-level PR review comes in at no cost.

Builder who wants an OpenAI-only model stack

Codex

It runs on OpenAI's GPT models (GPT-5.5 listed as the recommended frontier model), which keeps you on one vendor.

Frequently asked questions

Does Codex only run in the terminal?: No. Codex is listed across web, mac, win, linux, cli, and a VS Code extension, plus a cloud surface for code review on GitHub PRs.
Does CodeRabbit work on GitLab and Bitbucket?: Yes. It supports GitHub, GitLab, Bitbucket, and Azure DevOps.
What models does Codex use?: OpenAI's GPT models only — GPT-5.5 is listed as the recommended frontier model. Claude and Gemini are not available out of the box.
Is there a free option for either?: Codex has a Free plan at $0 /month. CodeRabbit has a free tier for open-source repositories; the price for that tier is not on file.
Do both review GitHub pull requests?: Yes, but differently. Codex spins up a cloud code review on a GitHub PR that comments inline and proposes fixes. CodeRabbit posts inline review comments on every PR as a bot.

What we compared

This page states nothing that is not in the two catalogue entries below. The exact text used to write it is reproduced here so you can check our reading, and both tools link through to their own pages and to the vendor.

/tools/coderabbit — checked 2026-05-25 · official site
/tools/codex — checked 2026-07-02 · official site

Show the source text

## CodeRabbit (/tools/coderabbit)
Tagline: AI code-review bot that posts inline review comments on every pull request across GitHub, GitLab, and Bitbucket.
Category: AI Coding Agents
Pricing model: freemium
Starts at: Pro — $24 /mo/user, billed annually
Platforms: web, cli
Public repo: none listed
Docs: none listed
Verified plans (read 2026-08-25): Pro $24 /mo/user, billed annually | Pro Plus $48 /mo/user, billed annually | Enterprise Talk to us | CodeRabbit Security $40 /mo/user | CodeRabbit Agent for Slack $0.50 per agent minute | Unrestricted CLI and PR Reviews Buy credits — rate not published
Strengths on file: Posts contextual review comments tied to specific diff lines, not just file-level summaries.; Free tier for open-source repositories.; Supports GitHub, GitLab, Bitbucket, and Azure DevOps.
Limits on file: Review depth depends on diff size — very large PRs are truncated.; Custom rule configuration takes time to tune for noise level.
CodeRabbit is an AI code-review bot that posts inline comments on every pull request across GitHub, GitLab, and Bitbucket.
Its strength is line-level, multi-platform review: contextual comments tied to specific diff lines rather than file-level summaries, across GitHub, GitLab, Bitbucket, and Azure DevOps, with a free tier for open-source repositories.
It fits teams that want automated review on every PR, especially across mixed Git hosts. Two caveats: review depth depends on diff size — very large PRs get truncated — and the custom rule configuration takes time to tune down noise.
It's the broad-platform PR reviewer next to Greptile's whole-repo approach, distinct from the in-editor assistants.

## Codex (/tools/codex)
Tagline: OpenAI's coding agent — works in the terminal, IDE, and cloud, reviews GitHub pull requests, and runs on GPT-5 models.
Category: AI Coding Agents
Pricing model: freemium
Starts at: Free — $0 /month
Platforms: web, mac, win, linux, cli, vscode-ext
Public repo: none listed
Docs: none listed
Verified plans (read 2026-08-21): Free $0 /month | Go $8 /month | Plus $20 /month | Pro 5x $100 /month | Pro 20x $200 /month | Business / Enterprise Not published | API Key Pay only for the tokens Codex uses, based on API pricing
Strengths on file: Runs one agent across CLI, IDE, desktop, and cloud — work moves between surfaces.; Strong GitHub integration: a cloud code review on a pull request that catches real bugs and proposes fixes.; Reads the shared AGENTS.md standard and supports MCP tools.; Included with ChatGPT plans, from the free tier up through Pro.
Limits on file: Locked to OpenAI's GPT models — no Claude or Gemini out of the box.; Fewer built-in customization primitives (hooks, sub-agents) than some rivals.
Codex is OpenAI's agentic coding tool. It runs the same agent across a terminal CLI, an IDE extension, a desktop app, and a cloud environment, so work started in one surface can continue in another. It reads the shared AGENTS.md instructions file, speaks the Model Context Protocol (MCP), and can spin up a cloud code review on a GitHub pull request that comments inline and proposes fixes. Codex runs on OpenAI's GPT models — currently GPT-5.5 as the recommended frontier model — and is included with ChatGPT plans, from the free tier up through Pro.

Change log

2026-08-25 — First published, compiled from the catalogue entries for CodeRabbit and Codex.