Instead of just asking an AI to write a PRD, first provide it with a "Socratic questioning" template. The LLM will then act as a thinking partner, asking challenging, open-ended questions about the problem and solution. This upfront thinking process results in a significantly more robust final document.
Codex lacks a built-in feature for parallel sub-agents like Claude Code. The workaround is to instruct the main Codex instance to write a script that launches multiple, separate terminal sessions of itself. Each session handles a sub-task in parallel, and the main instance aggregates the results.
Codex lacks formal custom commands. You can achieve the same result by storing detailed prompts and templates in local files (e.g., meeting summaries, PRD structures). Reference these files with the '@' symbol in your prompts to apply consistent instructions and formatting to your tasks.
Browser-based ChatGPT cannot execute code or connect to external APIs, limiting its power. The Codex CLI unlocks these agentic capabilities, allowing it to interact with local files, run scripts, and connect to databases, making it a far more powerful tool for real-world tasks.
Codex constantly asks for permissions, which slows down complex tasks. Using the `--yolo` command-line flag bypasses all approval prompts, allowing it to run uninterrupted. While this grants full access and carries some risk, it's a critical hack for improving workflow efficiency.
When a conversation with Codex approaches its context window limit, using `/new` erases all history. The `/compact` command is a better alternative. It instructs the LLM to summarize the current conversation into a shorter form, freeing up tokens while retaining essential context for continued work.
The Codex tool is distinct from the "GPT-5 Codec" model it contains. The specialized model is tuned only for coding and performs poorly on other tasks. For document analysis, summarization, and strategic thinking, product managers should stick with the general-purpose GPT-5 model for best results.
Codex exposes every command and step, giving engineers granular control. Claude Code abstracts away complexity with a simpler UI, guessing user intent more often. This reflects a fundamental design difference: precision for technical users versus ease-of-use for non-technical ones.