User Complaints: DeepSeek Ignores Rule Prompts, Falls Behind Qwen in Practice

Juulk9087 · reddit · 2026-08-02

A user running the DeepSeek model natively locally criticized the model for its inability to effectively follow user-defined rules and system prompts during actual coding tasks.

The user reported that the model ignores customized behavioral constraints regardless of using first or second-person prompts, or whether the prompts are in Chinese or English. They argue that this inability to be steered via rules is why many benchmark-heavy models fail in real-world, complex user environments. Frustrated by the model's subpar behavior, the author has decided to switch back to Qwen 27b.

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