Harness comparisonAI Coding
Claude Code (Claude Opus 4.1) vs OpenAI Codex (GPT-5) vs Cursor (GPT-5)
Next.js customer feedback app
Video byIan Nuttall@iannuttall · originally posted on XView original post on X 1,218 likes195,403 views
Claude Code with Claude Opus 4.1, Codex with GPT-5 and Cursor's CLI agent with GPT-5 get the same prompt: a Next.js app with Tailwind 4 and shadcn that collects customer feedback and shows it in a widget, with 30 minutes each.
Each side pairs a coding harness with its own model, so harness and model differences are mixed. More Claude Code vs OpenAI Codex. All harness comparisons.
The post, itemised
- Task
- Next.js customer feedback app
- Category
- Web/UI
- Mode
- Not stated
- Posted
- Video length
- 78.3 s
- Likes
- 1,218
- Views
- 195,403
- Bookmarks
- 835
- Sponsored
- No
Cost & time, as stated in the postEach harness got the same prompt and 30 minutes. Token counts are as the post states them.
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