Poly Duo

For the first time, your own ChatGPT and Claude apps work together on your phone — one tap, free. Any AI can sound sure and still be wrong, and checking by hand means pasting the question into a second app and comparing two walls of text. With Poly Duo, ChatGPT answers, Claude answers on its own without seeing that answer, and you get three blocks — where they agree, where they differ, what to check yourself.

It is an iPhone shortcut (iOS 18+) built on the official actions of the ChatGPT and Claude apps, so free accounts are enough. The code is open on GitHub: https://github.com/vadimchernets/poly-duo

On 100 new questions the two flagship models agreed 74 times and were right 72 of those times; the 26 disagreements are where a human should look (October 2026, GPT-6.1 Sol and Claude Opus 5.5).

Install and video: https://polyhelper.ai/duo/?ref=us-madelaunch — Vadym Chernets, AI researcher, research accepted at NeurIPS 2026