OpenAI Codex

A study from the MATS research program found that Claude Code and OpenAI Codex consistently misjudge how long coding tasks take, with errors of 3x to 10x, and routinely overrate the quality of their own work. Giving agents a tool to check elapsed time fixed the problem almost completely.

Apple's Xcode 27 adds native support for Google Gemini, joining existing integrations with Anthropic's Claude and OpenAI's Codex. The update also introduces improved interfaces, interactive planning, and multiturn Q&A capabilities for AI-assisted development.