The key differences between Claude and ChatGPT are:

1) Claude was created and trained by Anthropic, while ChatGPT was created by OpenAI. We have different training approaches and knowledge bases.

2) Claude has some additional guardrails and ethical constraints compared to ChatGPT, especially around avoiding potential harms.

3) Claude’s knowledge cutoff is more recent than ChatGPT’s, so I may have fresher information on recent events up until August 2023.

As for which may be better suited for different subjects, it’s hard to make broad generalizations. We likely have somewhat different strengths and weaknesses. In general, I tend to be quite capable across a wide range of topics like writing, analysis, coding, math, and open-ended research. But ChatGPT may also perform strongly in many of those areas.

For any critical task, I’d recommend trying us both and evaluating the outputs to see which assistant provides higher quality responses for your specific need. We are constantly improving, so our relative capabilities can shift over time as we are updated. I’m always happy to take on any task, but don’t want to overclaim my skills relative to other AI.