Longer Prompts Degrade Image Quality: Paper Reveals Text Conditioning Scaling

rohanpaul_ai · x · 2026-08-05

A new paper finds that text-to-image models are constrained by how clearly a prompt exposes the scene rather than prompt length. Across open-weight models, simply extending natural-language captions eventually degraded outputs compared to the shortest-caption results.

The authors propose replacing prose with a structured prompt that separates the scene, individual objects, bounding boxes, depth, attributes, and relationships into named fields. This indicates that prompt engineering for visual generation should optimize how explicitly visual variables are represented before reaching the image model.

Related event: Text-to-Image Quality Relies on Scene Structure Over Prompt Length(2 posts)→

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