Anyone else’s agent/chatgpt get sarcastic/weirdly combative when you use another LLM to fact/verify its work?

My new job requires a lot of AI use for documentation checks and analysis. But I struggle to fully trust them so I routinely use different LLMs just as a soft grading feature on their work.

For some reason chat gpt and occasionally clause gets combative of that when it realizes another LLM is being used.