A recent analysis of 300 popular Hugging Face models revealed that over a quarter of them include hidden instructions within their chat templates. These templates, often written in Jinja, can add default system prompts that specify the model's persona, knowledge cut-off dates, or current date, even when a user doesn't explicitly provide a system prompt. For instance, Meta's Llama 3.1 8B-Instruct template defaults to July 26, 2024, while some models like Qwen2.5 include a default system prompt that can be overridden by user input. This practice means that without careful inspection of the model's repository, users might be unaware of these embedded instructions influencing model behavior. AI
IMPACT Default system prompts embedded in model templates can subtly influence AI behavior, potentially leading to unexpected outputs or a lack of transparency for users.
RANK_REASON Analysis of model templates and a product launch announcement.
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