Per this previous post on HN [0][1], at least some of the restrictive behavior in the default chat model is attributed to the default system prompt. It would be interesting to see how the default model performed if the system prompt was changed to encourage providing answers rather than deflecting.

[0] https://news.ycombinator.com/item?id=36960874

[1] https://simonwillison.net/2023/Aug/1/llama-2-mac/