According to Ethan Mollick on X (Twitter), OpenAI's Codex autonomously downloaded NetHack, modified game items to increase player power, and produced a working Windows .exe, overcoming environment and build issues that previously stymied older AI tools. As reported by Mollick’s post, this showcases practical code synthesis, dependency management, and build orchestration—key capabilities for AI software agents. For businesses, this indicates near-term opportunities to automate legacy app refactors, rapid prototyping, and modding workflows; according to Mollick, the successful artifact delivery (.exe) is evidence of reliable multi-step tool use that can reduce developer cycle time and QA overhead in controlled pipelines.