From my perspective, there's a vast divide between open source models and GPT4 at present. The lmsys leaderboard rankings are derived from users independently engaging with the LLMs and opting for the answers they find most appealing. Consequently, the rankings are influenced not only by the type of questions users ask but also by their preference for succinctness in responses. When we venture into the realm of more complex tasks, such as code generation, GPT4 unequivocally outshines all open source models.

That said, the advancements in models like Orca and the "Textbooks are all you need" paper are noteworthy (https://arxiv.org/pdf/2306.02707.pdf, https://arxiv.org/abs/2306.11644). I'm optimistic about what future smaller models could achieve.