OpenAI Researchers Report 100% Codex-Generated Programming, Accelerating Development

OpenAI researchers are now using the company's Codex programming model to generate 100% of their code, according to internal reports circulating on social media. The development marks a significant acceleration in AI-assisted programming, with one researcher describing the shift as "freeing" from the burden of manual coding. The technology has enabled rapid development cycles, including building an MCP server in three days and launching a Sora Android app within three weeks. While efficiency gains are substantial, concerns are emerging about code review capacity and potential hidden errors in AI-generated programs. OpenAI CEO Sam Altman has announced new Codex-related products launching within the next month. The development reflects intensifying competition between OpenAI's Codex and Anthropic's Claude Code, with some developers reporting that GPT-5.2-Codex delivers more reliable results for complex tasks. The trend suggests a fundamental shift where "clearly describing requirements" may become the new core skill rather than manual coding.