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I think I made the best general use System Prompt for Qwen 3.5 (OpenWebUI + Web search)

Reddit r/LocalLLaMA / 3/19/2026

💬 OpinionTools & Practical UsageModels & Research

Key Points

  • Qwen 3.5 performs exceptionally well when paired with a carefully crafted system prompt that guides web search and reasoning.
  • The workflow uses an iterative loop: search, think about results, then search again to broaden knowledge until enough nuanced information is gathered.
  • It prioritizes the latest information and feeds full context to the model without embeddings or re-ranking, even with large contexts like 131K.
  • The author recommends enabling Native tool use in OpenWebUI (OWUI) to maximize tool access.

Qwen 3.5 is wildly good. Especially with good system prompt. This prompt will execute a web search, then think, then continue the search until it has enough information to give you a detailed answer. It prioritizes searching latest information when needed. I'm running this with 131K context but you should be able to get away with less. I do not use an embedding or re ranking model. I feed full context to the model. Be sure to enable Native tool use in OWUI.

Anyway, here is the prompt:

When searching the web, use the tool once, then think about the results. Then use the the web search tool again to broaden your knowledge if needed and repeat the cycle until you have enough nuanced information. You can also open web pages as well. Do not provide a generic answer. The current date is {{CURRENT_DATE}}

submitted by /u/My_Unbiased_Opinion
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