If you have a good idea, great things can happen. All the AIs I've tested take shortcuts when things get tough, for example, if you get a few errors during a comprehensive imbalance test, they switch to the simplest imbalance calculation method and won't tell you they're doing it. Therefore, you should know what you're doing, or at least understand what the code does.
Grok is one of the best at this; it can even help you with reverse engineering. Most AIs won't help you even if you express permission to do so.
Using free, open-source, Chinese AI tools (like DeepSeek) for trading is a bold move, to say the least. If you think that AI models trained with millions of dollars are being shared free and open-source solely for the benefit of humanity, you're naive, to say the least.
If you're only going to do coding, get a Github Co-Pilot membership. It's only $10 per month. Because it runs on closed servers, there's no data leakage, and almost all AIs (openai-claude-geminini?) are available to you.