Custom instructions vs. api system prompt

Hey. I’ve been playing with the custom instructions in the commercial ui and then in the api playground. When I put my ai’s “personality” into C.I. the responses are much more aligned with what I wrote. When I write the same instructions in the system prompt using API playground, the results are more vanilla and less like what I described.

I have tried with different settings like temperature, but it seems that C.I. might have something extra added to it, to make it follow instructions more clearly?

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