A Writesonic analysis reveals notable differences in citation sources between ChatGPT’s default model (GPT-5.3) and premium model (GPT-5.4). The premium model cites 56% brand websites compared to 8% by the default. Overall, the two models shared only 7% of sources. The divergence stems from differing search strategies; GPT-5.4 employs targeted sub-queries and utilizes site: operators, averaging 8.5 sub-queries per prompt, unlike GPT-5.3, which relies on broader inquiries. The default model favors third-party articles and blogs, while the premium model emphasizes brand content, particularly pricing pages. When comparing products, GPT-5.3 rarely cites brands, whereas GPT-5.4 predominantly does. This indicates that branding visibility in ChatGPT may hinge on the model used, affecting traffic insights for businesses. The findings underscore the evolving nature of AI models and their implications for SEO, content strategy, and brand management in digital landscapes.
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