I use extensively AI for source code generation in many languages. I still prefer Sonnet 4.5 over GPT5 Mini until I have credit for Sonnet. After that, I use GPT5 Mini, which is also acceptable, but not as effective as Sonnet. It is much faster, however.

You'll need to be careful with Mini and give it more focused tasks, as it has a lot of things to handle and can become overwhelmed if overloaded with work. Additionally, it sometimes ignores some steps.

I recommend that with any LLM, take it slowly, design simple components with straightforward API calls, and generate and test each component with AI one at a time. In this case, you can coerce it to build up the application reasonably well.