Codex code review alternative for AI-native engineering teams
Codex reviews changes.
Hyrax judges the system.
Codex can review a pull request and then take a follow-up task, which makes it useful for closing small gaps quickly. Hyrax evaluates whether work fits the system it lands in, and proves it by running the project test suite before the pull request opens.
Hyrax audits roughly 400 of its own repositories.
Free plan: full access, up to 100 PR reviews a month, a $30 starter credit, and $10/month ongoing.
[Hyrax] Refresh session token before expiry
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Why teams switch
What changes when Hyrax runs above the tools.
The codebase, not the diff
Codex code review sees the change in front of it. Hyrax audits the whole repository, so problems that no single pull request touches still surface.
Verified before it arrives
Every fix runs the project baseline tests, build and lint, and passes a second reviewer agent, before the pull request exists.
Context that compounds
The map of the codebase lives in the repository and improves with every merge, so the next decision starts from everything learned before it.
Comparison
How Hyrax and Codex code review make decisions.
Workflow
Comments on a diff, or a verified pull request.
- 01A pull request opens and Codex code review reads the diff.
- 02Codex code review returns comments, summaries and suggested changes.
- 03The team interprets the feedback, makes the edits, and merges.
- 01Maps the codebase and keeps the map in the repository
- 02Applies architectural judgment across six domains
- 03Opens a verified pull request that a human merges
Getting started
From install to the first verified pull request.
Install the GitHub App
Grant read access to the repositories in scope. No card is required to start.
Hyrax maps the repository
Discovery writes HYRAX.md and .hyrax/discovery into the repository, so humans and AI tools read the same context.
Review the first pull request
Approved improvements arrive as verified pull requests. A human merges every one.
The honest verdict
Both tools solve real problems.
Choose Codex code review if
The team already uses Codex for tasks and wants review in the same place. Keeping one tool for both is a fair reason to choose it.
Choose Hyrax if
Deciding what deserves attention matters more than reviewing what arrived. Hyrax audits six domains across the repository and verifies every fix against the project itself.
ChatGPT subscription or API usage.
Free plan with a $30 starter credit and $10/month ongoing. Paid is $30 per user per month, and each paid user gets $30/month of credits.
FAQ
Questions about Codex code review and Hyrax.
Yes, and most teams run both. Codex code review keeps doing its job. Hyrax works at the level of the whole codebase, decides what is worth changing, and delivers verified pull requests. Nothing about the Codex code review setup has to change.
Discovery writes HYRAX.md and a .hyrax/discovery directory, which document the architecture, conventions and risk areas of the codebase. Everything else arrives as a normal pull request on its own branch. Hyrax has no write access to the default branch.
The free plan includes full access, a $30 starter credit and $10/month of credits ongoing, with no card required. The paid plan is $30 per user per month, and each paid user gets $30/month of credits. Pull request reviews are included on every plan.
Installing the GitHub App and granting access to a repository takes a few minutes. Hyrax maps the codebase, then runs the first audit and returns findings ranked by severity and effort. The first verified pull requests follow once an audit is approved.
Build what you're proud to ship.
GitHub-native. Human-controlled. Verified before merge.