How I Used GPT-5.6 Sol to Upgrade an Existing Product Without Rebuilding It
A solo builder’s notes on using GPT-5.6 as a product reviewer, code reviewer, and design partner—not just a code generator.
In 2025, I wrote about using Cursor and AI to build Focero, a small web-based focus timer.
That first phase was mostly about creation.
I was generating layouts, implementing timer logic, adding multilingual pages, fixing bugs, and trying to turn a simple idea into a working product.
The next phase was very different.
By 2026, the app was no longer a blank project. It already had an existing codebase, working pages, search visibility, returning users, design decisions, technical debt, and features that should not be casually replaced.
Starting over would have been easy.
It would not necessarily have been correct.
So instead of asking AI to build another version of Focero from scratch, I used GPT-5.6 Sol in ChatGPT as a product reviewer, code reviewer, and design partner.
The goal...
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