Chinese gamification company SUD has released the COCOS 4 game engine as fully open source software, just two months after acquiring it for $72 million. Previously proprietary, the engine is now available under the MIT license with all commercial restrictions removed. This move aims to attract more developers and integrate AI-native features.
The COCOS game engine, a cross-platform platform popular in Asian markets for lightweight mobile and in-app games, has marked a significant shift by becoming open source. Acquired by SUD in November 2025 for $72 million, the engine's latest version, COCOS 4, was announced open source on January 5, 2026.
SUD stated that the decision removes all commercial restrictions and places COCOS 4 under the MIT license. The release separates the engine from its editor: COCOS now refers solely to the engine core, building on Cocos Creator 3.x with forward compatibility and adherence to Semantic Versioning rules, including a six-month deprecation window before removals.
A new standalone IDE called PinK will handle production pipelines, incorporating built-in Agents and migrating visual features from previous Cocos Creator versions. The open source package includes the engine core, cross-platform code for all native platforms, COCOS CLI, and full IDE headless mode, with mini-game support to roll out gradually. Core editing functions are transitioning to headless mode, accessible via CLI.
SUD emphasized no direct commercialization goals for COCOS 4, focusing instead on expanding the developer base to foster more game content essential for long-term growth. The open source model was chosen to accelerate AI-native functionality, as 'AI can better understand open code and guide the engine to evolve in AI-friendly directions.' Additional aims include encouraging pull requests to strengthen the engine through community contributions and achieving global reach by uniting game and AI developers in an open ecosystem.
Future development prioritizes AI features, delivered as MCPs or Agents rather than libraries, while lightening the engine for broader device compatibility. Cross-platform support will expand to Steam and others, with fixes for bugs like Spine-related issues and performance boosts for rich text and lists. Developers can now modify any code or even fork it to build new engines.
The source code and documentation are available on the COCOS GitHub repository.
