Not an LLM specifically, in particular lack of backtracking and the network depth limits as well as interconnectivity limits sets hard limits on capabilities.

https://www.lesswrong.com/posts/XNBZPbxyYhmoqD87F/llms-and-computation-complexity

https://garymarcus.substack.com/p/math-is-hard-if-you-are-an-llm-and

https://arxiv.org/abs/2401.11817

https://www.marktechpost.com/2023/08/01/this-ai-research-dives-into-the-limitations-and-capabilities-of-transformer-large-language-models-llms-empirically-and-theoretically-on-compositional-tasks/?amp

Humans have a completely different memory model and a in large part a very different way of linking together learned concepts to form their world view and to develop interdisciplinary skills, allowing us to solve many kinds of highly complex tasks as long as we can keep enough of it in our memory.