LLaMA2 is far and away from GPT 3.5. Just look at HumanEval and other code generation metrics. All these GPT-4 based "chat evals" are extremely misleading and people should take it with a bag of salt.
The ranking I linked and quoted in my comment's is much better. See the About tab. It has 4 evaluations and it doesn't use GPT-4 to evaluate.
Also the top one is a tuned Llama 2. Also clarified in my original comment.