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It's Not What You Say, It's How You Say It: Evaluating LLM Responses to Expressions of Belief

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TL;DR - This paper introduces a linguistically grounded benchmark for measuring how expressions of belief influence whether LLMs follow user-provided context or prior knowledge. Results show systematic sensitivity to phrasing, raising robustness and prompt-engineering concerns.

  • The typology covers 17 expression types across form, evidentiality, epistemic stance, and tone.
  • Controlled belief-query pairs isolate linguistic framing effects while using world-knowledge facts.
  • Evaluation spans 16 Llama3, Qwen3, and Gemma3 models from 1B to 30B parameters.
  • Larger and instruction-tuned models were generally less context-following, while some expression types were consistently more persuasive than others.

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It's Not What You Say, It's How You Say It: Evaluating LLM Responses to Expressions of Belief

arXiv cs.CL Kevin Du, Clara KĂĽmpel, Michelle Wastl, Alex Warstadt 2026-07-20 arXiv:2607.18232 doi:10.18653/v1/2026.acl-long.142
Public signals OpenAlex citations 0
Providers: Hugging Face · N/A OpenAlex · Citations 0 Publisher · N/A Semantic Scholar · N/A X · N/A Fetched 2026-08-20 14:37:04.224691 UTC

TL;DR - This paper introduces a linguistically grounded benchmark for measuring how expressions of belief influence whether LLMs follow user-provided context or prior knowledge. Results show systematic sensitivity to phrasing, raising robustness and prompt-engineering concerns.

  • The typology covers 17 expression types across form, evidentiality, epistemic stance, and tone.
  • Controlled belief-query pairs isolate linguistic framing effects while using world-knowledge facts.
  • Evaluation spans 16 Llama3, Qwen3, and Gemma3 models from 1B to 30B parameters.
  • Larger and instruction-tuned models were generally less context-following, while some expression types were consistently more persuasive than others.
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