Video by Aj Yadav (@thevibefounder) · originally posted on XView original post on X
Claude Code (Claude Opus 5) vs OpenAI Codex (GPT-5.6 Sol)
Checkout-outage incident room
Aj Yadav@thevibefounderHarness comparison1 likes224 views
Claude Code with Claude Opus 5 (high) and Codex with GPT-5.6 Sol (high) build an incident room for a checkout outage from the same prompt, with a 20-minute first pass and no manual fixes.
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.
Harnesses and models
| Harness | Model | Effort | Notes |
|---|---|---|---|
| Claude Code | Claude Opus 5Anthropic | high | Left; first pass.Written as “Opus 5” |
| OpenAI Codex | GPT-5.6 SolOpenAI | high | Right; labelled “after QA”. |
Details
| Kind | Side-by-side (same post, same prompt) |
|---|---|
| Task | Checkout-outage incident room |
| Category | Web/UI |
| Mode | Not stated |
| Posted | |
| Video length | 14.2 s |
| Likes / views | 1 / 224 · as of Oct 18, 2026 |
| Bookmarks | 0 |
| Notes | The left side is labelled first pass and the right side after QA, so the two may not be at the same stage. |
| Sponsored | No |
| Original post | x.com/thevibefounder/status/2081153432757694862 |
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