Best things about Claude: it will often figure out a good feedback loop where it can build + test and get quick feedback about whether the thing is working. This works best in Claude code but can be effective in cursor too

Best things about gpt: the precision. I don't even care that they're slow, it just let's me queue up more work

Best things about codex: it's a little smarter at handling very hard or very easy tasks. It might spend less time on easy tasks and even more time on hard ones

Best things about grok: speed plus leetcode style ability

All of them tend to benefit from a feedback loop if you can give them great tests or good static analysis etc, but they will cheat if you let them (any in ts)