Build a Pomodoro app using GPT-5 Codex CLI and Claude Code

Press play on the video. It'll jump straight to the section that answers the title above — no need to watch the full video.

Claude Code OpenAI Codex

Claude Coding Software Development

A comparative demo of building a timer application automatically via the command line interface (CLI) using two of the latest AI coding models.

Differences in 'Agentic' Styles

Codex tends to proceed with executing the plan without interruptions, whereas Claude Code frequently requests additional 'permission' before making file changes.

Output Strengths vs. Weaknesses

Claude Code is often 'over-ambitious' by adding complex UI (such as gradient backgrounds), but it occasionally introduces bugs into the app logic. Codex is simpler and remains focused on the requested features, which typically results in better stability.

Claude Troubleshooting Tips

If Claude produces inconsistent results, note that Anthropic has acknowledged recent API stability issues. Using the Opus model can help yield more accurate results for the time being.

More from AI-Powered Coding & App Development

None

Execute Headless Claude Code Commands with Local Context

Build automated AI agents with Claude Code

Syncing work context with Multi-AI workflows

Claude Google Gemini

Managing project memory and context with Claude Memory

Analyze Sales Call Audio Recordings with Google AI Studio

Google AI Studio Google Gemini