# Greptile takes bug detection beyond code review with GPT-6 Astra

DevFeed: [Greptile takes bug detection beyond code review with GPT-6 Astra](<https://devfeed.tech/articles/greptile-takes-bug-detection-beyond-code-review-with-gpt-6-astra-101257.md>)

Original publisher: [Read original article](<https://openai.com/index/greptile-code-review-codex-astra>)

Published: 2026-10-26T22:00:00Z

Content type: article

Language: en

Sources: [OpenAI News](<https://devfeed.tech/sources/openai-news.md>)

Topics: [gpt-6-astra](<https://devfeed.tech/topics/gpt-6-astra.md>), [codex](<https://devfeed.tech/topics/codex.md>), [ai code review](<https://devfeed.tech/topics/ai-code-review.md>), [Pull Request](<https://devfeed.tech/topics/pull-request.md>), [ui-testing](<https://devfeed.tech/topics/ui-testing.md>)

Tags: [agents](<https://devfeed.tech/tags/agents.md>), [astra](<https://devfeed.tech/tags/astra.md>), [bug](<https://devfeed.tech/tags/bug.md>), [code](<https://devfeed.tech/tags/code.md>), [code-review](<https://devfeed.tech/tags/code-review.md>), [codex](<https://devfeed.tech/tags/codex.md>), [detection](<https://devfeed.tech/tags/detection.md>), [gpt](<https://devfeed.tech/tags/gpt.md>), [gpt-6](<https://devfeed.tech/tags/gpt-6.md>), [gpt-6-astra](<https://devfeed.tech/tags/gpt-6-astra.md>), [reduce](<https://devfeed.tech/tags/reduce.md>), [review](<https://devfeed.tech/tags/review.md>), [rework](<https://devfeed.tech/tags/rework.md>), [security](<https://devfeed.tech/tags/security.md>), [startup](<https://devfeed.tech/tags/startup.md>), [takes](<https://devfeed.tech/tags/takes.md>), [test](<https://devfeed.tech/tags/test.md>), [user](<https://devfeed.tech/tags/user.md>), [uses](<https://devfeed.tech/tags/uses.md>), [with](<https://devfeed.tech/tags/with.md>), [workflows](<https://devfeed.tech/tags/workflows.md>)

## AI overview

Greptile uses GPT-6 Astra to test pull requests by running a development server, resizing the browser to an iPhone-sized viewport, and simulating user interactions so it can detect visual and workflow issues that code inspection alone may miss. The company says this automates testing that would be too slow for a QA firm to perform on every change. Separately, its Daybreak product is described as helping customers strengthen security, without further detail on its methods. Greptile also exposes its codebase documentation through an MCP server so Codex can follow existing customer patterns; the company tracks AI-code reverts and says supplying agents with this context reduces them. It also uses Codex internally and sees faster development as a benefit of Ultrafast. These are claims in the supplied excerpt, not independent evaluations.

## Source excerpt

How Greptile uses GPT-6 Astra to test user workflows, Daybreak to strengthen security, and Codex to reduce rework.