Deepseek is really good, and I've found it consistently better than ChatGPT. I don't know what the hype behind OpenAI is. I don't know if they were better and got worse, because I could swear ChatGPT was good at some point in the past.
I am thrilled with DeepSeek V4 Flash via API as it's very good and very cheap. But for everyday advanced tasks and coding even DS V4 Pro is nowhere near GPT 5.5 nor Claude Opus 4.7 (and never mind 4.8). I think V4 is a great release but the frontier is moving fast, too.