Capcom is preparing RE Engine for a very different future. At the company’s CAPCOM Open Conference RE:2026, programmer Satoshi Ishida presented the next phase of the engine behind the publisher’s biggest games — an ambitious project called REX, designed to evolve the technology without replacing it entirely.
RE ENGINE has quietly become Capcom’s technological backbone. Originally developed in 2014 and first used commercially with Resident Evil 7 in 2017, it has since powered more than 27 of the company’s titles — and more than 2,000 Capcom developers across different countries now work in it. But after more than eight years of continuous development, Capcom has hit problems that can’t be solved by simply bolting on more features: modern games have become massive, their data has grown dramatically, and increasingly complex development tools can turn simple changes into lengthy waiting periods — all while AI reshapes virtually every corner of the industry.
What REX Actually Includes
REX is a set of interlocking components aimed at those exact problems. RE:Dox creates a common way of handling different types of game data, which Capcom says can significantly improve loading and editing speeds. RE:UI tackles sluggish development software by cutting unnecessary memory usage and processing, keeping tools responsive even as they grow more complex. RE:Runtime makes the engine itself more efficient by grouping the huge numbers of characters and objects modern games keep active at once, and RE:C++ can translate developer-friendly code into a form optimized for faster machine processing.
An Engine Built for Humans — and AI
The most intriguing part of REX is what all of this could eventually enable. Capcom wants RE ENGINE to become more suitable for an era where developers and AI work alongside each other: by establishing a more consistent programming foundation, the company hopes to make its systems easier for both humans and AI to understand — which could eventually allow AI to assist with programming, generate parts of a game, run tests, and even playtest builds automatically to identify potential bugs.
Capcom is already taking steps in that direction: technologies including RE:Dox and RE:Log have been released as open-source projects. We’re still a long way from AI independently building the next Resident Evil from beginning to end — but with 85.8% of Japanese game developers now reporting generative AI use, REX shows Capcom thinking far beyond simply making its engine faster.