Holiday Extras rebuilt its main app in two weeks with OpenAI's Codex

Nov 12, 2026
The UK travel extras company says work that would have taken more than six months took two weeks, and agents now prepare fixes from customer complaints.

UK travel company Holiday Extras rebuilt its main mobile app in two weeks using OpenAI's Codex, progress it says would previously have taken more than six months, according to a customer story published by OpenAI.

The company had already given all staff ChatGPT Enterprise. With Codex, Liam Thompson, its vice president of AI innovation and former head of design, worked with engineers to turn his understanding of customers into software, while engineers focused on architecture, APIs and security. Codex let the team build iOS and Android features together instead of Android lagging behind.

Customer feedback now feeds straight into fixes. When a user of its Countdown app complained about a missing list view, an agent prepared the change, Thompson approved it and the customer changed a one-star review to five stars. The figures and examples come from OpenAI's own customer story.

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