Buy Greptile, or build your own?
A basic review agent is easy to build. Making it reliably catch critical bugs takes much more.
Greptile has learned from millions of bugs across millions of changes
Your internal review agent is only exposed to new types of bugs as they come up in your codebase. Greptile reviews and tests millions of pull requests across tens of thousands of companies. This range exposes types of bugs and model errors that one company's code may never reveal.
As a result, we are able to make Greptile very good at catching a very wide range of bug types.
- 69.1B
- 24.9M
- 2.43
Greptile can more confidently iterate the agent due to the diversity and breadth of its evals
There will constantly be new models, tools, and techniques, so you will need to keep iterating your internal review agent. Iterating an internal review agent is very difficult. Serious bugs are very uncommon, so you may make a change to a model, prompt, or tool, and the regression may go unnoticed for months.
Greptile evals every update to its agent across millions of buggy PRs to ensure it can reliably catch the maximum number of critical bugs.
Agent is continuously iterated:
- 01
New model, prompt, or tool
- 02
Evaluate against millions of buggy PRs
- 03
Measure what the agent catches
- 04
Improve the next review
Good is easy. A lot goes into making a review agent great.
A coding agent being 70% as good as the frontier might be okay, but a validation agent which you trust to validate and even approve your changes needs to be as close to perfect as possible. While getting to 70% is as easy as putting a frontier model agent in a sandbox, getting to 95% is a lot of work. There is a lot of value in increasing the likelihood of preventing the few truly catastrophic incidents.
An internal review agent needs code search, current documentation, isolated test environments, browser tests, warning filters, and a test system.
Read how to build a code review agentCode search
Find the context beyond the diff.
Current documentation
Understand the codebase and intent.
Isolated environments
Install dependencies and run the code.
Browser tests
Check real user flows.
Warning filters
Keep the review focused on real bugs.
Evaluations
Know whether each change is an improvement.
Greptile is far more token-efficient than your internal review agent
Using frontier models for every step can cost $3–15 per review. Greptile combines models and tools to deliver reviews at a fixed $1 per review.
Maximum price/performance through optimizing model routing
Thanks to Greptile’s expansive eval set, we are constantly optimizing tools and models for every subtask within the review process so we can provide outsized value at a predictable fixed cost per review.
Your next step, either way.
Explore Greptile with our team, or read our guide to building a code review agent, from the basic workflow to codebase context, testing, and inference costs.