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Large Language ModelsOpenAI BlogPublished: May 15, 2026, 13:00 JST

Sea Rolls Out Codex Across Engineering Teams

3 Key Points

  1. What happened

    Sea Limited is rolling out OpenAI's Codex across its developer organisation, with internal data showing 87% of users are weekly active users. The company has also partnered with OpenAI to host the first regional Codex Hackathon Series across Asia, starting in Singapore.

  2. Why it matters

    Sea's CPO David Chen sees AI-assisted development as a structural multiplier, not just a productivity boost. Codex helps engineers navigate large codebases, and the company is using it to drive engineering discipline by generating test coverage and paying down technical debt.

  3. What to watch

    The shift hinges on whether developers truly move from passive autocomplete to agentic workflows. Chen predicts engineering teams will become more leveraged, with developers evolving into "system orchestrators" who focus on product judgment and system design.

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Context & Analysis

Sea Limited's decision to roll out Codex across its entire developer organisation reflects a broader strategic bet on AI-native software development. The company, founded in Singapore, operates across digital entertainment, e-commerce, and digital financial services in fragmented, hyper-localized markets. Its CPO, David Chen, frames the adoption not as a marginal efficiency gain but as a structural multiplier that helps engineers manage complexity and maintain reliability under peak loads.

The internal data showing 87% weekly active users suggests the tool has moved beyond novelty into daily workflows. Chen reports that developers are using Codex to "think better" rather than just type faster, with AI agents autonomously proposing test-driven implementations and surfacing edge cases. This aligns with his view that the technology helps pay down technical debt and ship more resilient systems.

The partnership to bring the Codex Hackathon Series to Southeast Asia indicates a deliberate effort to build a regional developer ecosystem around these tools. Chen believes the region's complex, multilingual problems make it a proving ground for AI-native development. The stakes are whether engineering teams will successfully reconfigure around human-AI collaboration, with developers evolving into orchestrators of AI-driven workflows rather than simply writing code.

FAQ
What is Codex?
Codex is an agentic AI coding tool from OpenAI that goes beyond autocomplete. It provides deep contextual awareness of large codebases, helping engineers trace dependencies and understand legacy logic.
How is Sea using Codex in daily development?
Developers at Sea use Codex for code understanding, debugging, and feature development. AI agents are increasingly operating within CI/CD pipelines, reasoning through product requirements, proposing test-driven implementations, and accelerating debugging loops.
What is the Codex Hackathon Series?
Sea and OpenAI have partnered to host the first regional Codex Hackathon Series across Asia. It begins in Singapore and will head to markets including Indonesia, Taiwan, and Vietnam.

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