May 14 : OpenAI said on Thursday its coding tool Codex was being added to the ChatGPT mobile app, expanding access to the product as competition intensifies in the market for AI code-generation tools. Coding tools have become an important way for AI companies to reach business customers, with OpenAI competing against rivals, including Anthropic, whose Claude Code tool has gained traction among developers. Codex can perform tasks such as writing features, answering questions about codebase,