I used to use GPT-4o when I needed to draft documents at work, but since GPT-5 came out, I tried the beta.
Overall, its contextual understanding has improved a lot, and it really maintains consistency, especially in long-form writing. It still occasionally stumbles on technical terms in certain fields when writing in Korean, but the overall quality is satisfying.
If you're considering adopting it, I'd suggest calculating the cost-effectiveness first. Choosing the right plan will depend on your monthly usage.