GPT-5.3 Codex vs Claude Opus 4.6: Real Coding Tasks
In this video, I compare GPT-5.3 Codex and Claude Opus 4.6 using a benchmark overview plus 4 real engineering tasks. Connect with me 🤗 - X: https://x.com/_alejandroao - LinkedIn: https://www.linkedin.com/in/alejandro-ao/ Tasks covered: - Landing page improvement - Visual physics simulation - One-shot web game build - Laravel to Next.js migration I use the same task framing for both models and score them based on practical output quality and execution. Chapters: 00:00 Introduction and methodology 01:38 Announcement benchmarks and pricing 04:17 Task 1 - Landing page improvement 08:34 Task 2 - Visual physics simulation (Claude and Codex results) 12:50 Task 3 - One-shot web game 15:20 Task 4 - Laravel to Next.js migration (build and results) 21:47 Final score and conclusion
