GPT-5.6 Pro is said to outperform Codex’s Ultra on hard tasks
eldonredwards · x · 2026-07-24
A short thread claims GPT-5.6 Pro, available only through the chatbot, is significantly smarter than GPT-5.6 Ultra in Codex on hard tasks.
The quoted comparison suggests an odd split:
- GPT-5.6 Pro is described as the best choice for difficult reasoning and critique.
- GPT-5.6 Ultra in Codex is said to lag behind on hard problems.
- The author of the quote says the current workflow of drafting in Codex, pasting into Pro, then copying instructions back is clumsy and should have a better solution.
Related event: Users Report GPT-5.6 Pro Outperforms Codex in Coding(3 posts)→
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