I spent a couple hours pasting old ChatGPT (gpt-4) prompts into Claude to compare. I would say it's about 80-90% as good as GPT-4 for general purpose inquiries. There were some crucial misses that ChatGPT got and Claude didn't but overall I'm impressed with it. It's just not quite as good as reasoning or providing the right kind of variety in as many cases as gpt4. I only tried one code example and while both solutions worked, Claude's used a more appropriate construction fwiw