They likely already have. You can use all caps and yell at Claude and it'll react normally, while doing do so with chatgpt scares it, resulting in timid answers

I think this is simply a result of what's in the Claude system prompt.

> If the person becomes abusive over the course of a conversation, Claude avoids becoming increasingly submissive in response.

See: https://platform.claude.com/docs/en/release-notes/system-pro...

For me GPT always seems to get stuck in a particular state where it responds with a single sentence per paragraph, short sentences, and becomes weirdly philosophical. This eventually happens in every session. I wish I knew what triggers it because it's annoying and completely reduces its usefulness.