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Greptile says it uses GPT-6 Astra to test user workflows, Daybreak for security checks and Codex to reduce rework in code review.
Greptile said it is using GPT-6 Astra to test user workflows, Daybreak to strengthen security and Codex to reduce rework, framing the combination as a way to catch bugs beyond traditional code review. The company described the approach in a post published on Monday, 26 October 2026, alongside its broader push into AI-assisted review and validation.
Evidence and context
The source material does not provide technical benchmarks or quantified performance results for the workflow-testing approach. It does indicate that Greptile is positioning its tooling as more than a static pull-request reviewer: the company’s existing system builds a graph of repository files, functions and dependencies, then uses parallel agents to examine pull requests with broader codebase context and learn team conventions from review comments, according to Greptile’s product and company pages.
That framing fits a series of recent product moves. On 9 October 2026, Greptile published a technical overview on how to build a code review agent, and on 25 September 2026 it introduced Plus and Apex review tiers for more intensive pull-request analysis. Greptile also announced a $50 million Series B led by Menlo Ventures at a $750 million valuation on 19 October 2026. Those figures come from the company announcement and participating investor Operator Collective.
Background material supplied for this report says Greptile was founded in 2023 by Daksh Gupta, Soohoon Choi and Vaishant Kameswaran, with Gupta as CEO and Choi as CTO. It also says the company participated in Y Combinator’s Winter 2024 batch and that its current focus is AI-assisted code review and independent validation of human- and AI-generated code. The company’s earlier offering helped developers query large codebases through a web application and API.
The latest post therefore appears to extend Greptile’s stated product direction rather than introduce a separate business line. However, no date was supplied for a next catalyst beyond the publication of the 26 October 2026 post, and the source material does not include operational metrics, customer commentary or deployment details specific to GPT-6 Astra, Daybreak or Codex beyond the named functions described above.
