Simplex Deploys Codex and ChatGPT Enterprise to Cut Development Time by 70%
Adopt Codex as the primary coding agent to cut design time by 40% and development time by 70%.
Adopt Codex as the primary coding agent and integrate it into your CI/CD pipeline to reduce design and development time.
Summary
Simplex has rolled out ChatGPT Enterprise across its organization and selected Codex as its primary coding agent, positioning AI at the core of its software delivery process. The company uses Codex not only for code generation but also for front‑ and back‑end development from design documents, unit test creation, non‑functional requirement review, and automated fixes during internal integration testing. Internal pilots show a 40% reduction in hours spent designing each screen, a 70% cut in development time per screen, and a 17% decrease in integration testing effort.
Beyond speed, Codex improves review accuracy across multiple files, enabling smaller teams to advance design work more efficiently. Simplex is redefining its development workflow from a linear sequence to a rule‑based, iterative model that leverages AI for implementation, validation, and continuous improvement. The approach treats AI adoption as an operating model with governance, training, and shared expertise, aiming to free senior engineers for higher‑level decision making while AI handles routine coding and testing tasks.
Key changes
- Simplex adopted ChatGPT Enterprise as the foundation for company‑wide AI deployment
- Codex selected as the primary coding agent and used for code generation, design, testing, and fixes
- Codex generates front‑ and back‑end code from design documents and reference implementations
- Codex creates unit tests, reviews non‑functional requirements, and fixes integration issues
- Codex CLI runs Python scripts for continuous deployment from server implementation to end‑to‑end test fixes
- Internal evaluation shows 40% fewer hours to design each screen, 70% fewer hours to develop each screen, and 17% fewer hours for integration testing
- Codex improves accuracy of reviews across multiple files, enabling smaller teams to move design work forward
- Simplex is redefining its development process around AI, moving from a linear sequence to rule‑based iterative integration