Ask ChatGPT’s default and premium models the same question, and they’ll cite almost entirely different sources, according to a Writesonic analysis.
GPT-5.4 Thinking, ChatGPT’s premium model, sent 56% of its citations to brand websites. GPT-5.3 Instant, the default for all logged-in ChatGPT users, sent 8%.
Across all prompts, the two models shared only 7% of their cited sources. The reason comes down to how each model searches the web before answering.
Same Question, Different Search Strategy
When models were asked about CRM software, GPT-5.3…

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