E02¶


Research	R0027 — Multilingual prompt engineering challenges
Run	2026-03-26
Query	Q001
Source	SRC07
Evidence	SRC07-E02
Type	Statistical

English prompts outperform translated prompts across all languages tested

URL: https://arxiv.org/html/2504.17720v2

Extract¶

"Using English prompts consistently outperformed translated prompts (72.7% vs. 67.2% average)." This 5.5 percentage point advantage of English prompts held across all tested languages, indicating that even when task data is in a non-English language, English instructions yield better performance.

Relevance to Hypotheses¶

Hypothesis	Relationship	Strength
H1	Supports	Directly demonstrates prompt language affects performance
H2	Contradicts	Clear, consistent advantage for English prompts
H3	Supports	The advantage is consistent but varies in magnitude by language

Context¶

This finding is consistent with SRC06 (Arabic prompting study) and suggests a general pattern: models have been optimized for English instruction-following regardless of task language.