Prompt Revision as a Source of Cultural Bias in Text-to-Image Systems

Aleksandra Urman, Elsa Lichtenegger, Salima Jaoua, Azza Bouleimen, Robin Forsberg, Corinna Hertweck, Stefania Ionescu, Nicolò Pagan, Ancsa Hannak, Joachim Baumann


Abstract
Commercial text-to-image systems silently revise user prompts before generating images, a step users typically cannot disable or even see. Existing audits of cultural bias examine only the final images and treat generation as a single pipeline, so they cannot tell where the bias originates. We introduce WORLDVIEW, a multilingual benchmark of 8,960 prompts across 15 languages and 31 language–context pairings. Using it, we audit the revision layer in three systems (DALL-E-3, Imagen-4, GPT-Image-1.5) through a three-step analysis of how heavily it marks each cultural context, whether it flattens that context into a narrow vocabulary, and whether that vocabulary is stereotypical. Relative to a no-context English baseline, the US is the least-marked context, while non-Western and non-Anglophone contexts are marked far more heavily, flattened into narrow vocabularies applied across topically diverse prompts, and reduced to recognizable cultural stereotypes. Comparing images from original versus revised prompts on models without a revision layer, we identify the layer itself as a previously undocumented, causal source of this stereotyping. To locate cultural bias, and fix it, we must audit the system as deployed, not the model alone.
Anthology ID:
2026.emnlp-main.1599
Volume:
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Month:
October
Year:
2026
Address:
Budapest, Hungary
Editors:
Hung-Yi Lee, Sunipa Dev, Jessy Li, Desmond Elliott
Venue:
EMNLP
SIG:
SIGDAT
Publisher:
Association for Computational Linguistics
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Pages:
36352–36377
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URL:
https://aclanthology.org/2026.emnlp-main.1599/
DOI:
Bibkey:
Cite (ACL):
Aleksandra Urman, Elsa Lichtenegger, Salima Jaoua, Azza Bouleimen, Robin Forsberg, Corinna Hertweck, Stefania Ionescu, Nicolò Pagan, Ancsa Hannak, and Joachim Baumann. 2026. Prompt Revision as a Source of Cultural Bias in Text-to-Image Systems. In Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing, pages 36352–36377, Budapest, Hungary. Association for Computational Linguistics.
Cite (Informal):
Prompt Revision as a Source of Cultural Bias in Text-to-Image Systems (Urman et al., EMNLP 2026)
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https://aclanthology.org/2026.emnlp-main.1599.pdf