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[GH-ISSUE #19049] feat: general system prompt shouldn't overwrite system prompt of custom model #18757
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Reference: github-starred/open-webui#18757
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Originally created by @burntcouscous on GitHub (Nov 8, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/19049
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Problem Description
In setttings > general I have a system prompt. I also created a custom model entry (workaspace > models> ) and added a system prompt. When I start a chat with that model it uses the 'general' system prompt instead of the one specifically definid in the model.
I can see this from the sqlite db as well as from how it responds.
Desired Solution you'd like
Imo the general system prompt should work as a default-fallback. Not like a global that overwrites more specifically defined system prompts on custom models.
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@tjbck commented on GitHub (Nov 8, 2025):
@silentoplayz setting level system prompt should be appended to the existing system prompt is this not the case currently?
@silentoplayz commented on GitHub (Nov 8, 2025):
Yes, I can confirm that a model level system prompt is appended to the existing system prompt in Settings -> General. This applies for both base models and custom models. This same behavior occurs as expected if I was to remove the system prompt from Settings -> General and place the system prompt in the chat controls sidebar within a chat.