GPT-5.2-Codex vs Claude Code Opus 4.5 – Vibe Coding a Physical Product

Timestamps:

00:00 - Intro
00:50 - Test Introduction
02:09 - Prompt Overview
03:22 - Coding Model Settings
03:52 - Codex Product Idea
04:39 - Claude Product Idea
05:11 - Vibe Building Begins
06:16 - Codex 3D Product Design
07:01 - Claude 3D Product Design
08:05 - 3D Enclosure Results
09:35 - Agent CAD Designs
14:46 - Physical Building Steps
15:15 - Codex Software Test
16:58 - Building Codex Device
19:32 - Building Claude Device
23:13 - Claude Code Result Overview
25:38 - Codex Result Overview
26:38 - Claude Code Product Detail Look
28:04 - Codex Product Detail Look
29:04 - Having Them Check Their Work
30:34 - Experiment Summary
31:16 - Closing Thoughts

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In this video, we put GPT-5.2 Codex and Claude Code Opus 4.5 into a head-to-head experiment focused on vibe coding a real physical product. Rather than limiting the comparison to abstract prompts or benchmarks, we task each model with ideation, 3D design, enclosure planning, software development, and real-world build considerations.

We begin with shared prompts and configuration settings, then let each model independently propose a product concept. From there, we move into 3D product design, CAD-style enclosure generation, agent-driven refinements, and actual physical build steps. Each model is also asked to review and critique its own work to see how well it can reason about mistakes and improvements.