OpenAI has released Codex-CLI version 0.23, which includes a 50% increase in usage limits for ChatGPT Plus users, enhancing the coding experience with GPT-5 integration. The Codex CLI tool, accessible via npm installation, supports advanced features such as a new /model command and a "minimal" version of GPT-5 aimed at improving efficiency. Users have noted that GPT-5 offers improved reasoning capabilities, especially when using the high reasoning mode, and that the tool is included in the ChatGPT subscription plan. A recent bug that prematurely triggered usage limits was fixed, and usage limits were reset for all users. While some users praise Codex CLI as a step forward in command-line coding interfaces, others have expressed mixed opinions about its usability compared to integrated development environments (IDEs) and alternative coding agents like Sonnet and o3. Overall, the tool is gaining traction among developers, with rapid iteration and growing adoption noted by industry observers.