On March 3, 2026, OpenAI pushed GPT-5.3 Instant to all ChatGPT users, free and paid, with no fanfare about what else might have changed beneath the surface. Within days, SEO and AI search practitioners began documenting something unexpected: The internal metadata that had allowed third-party tools to observe ChatGPT’s query fan-out behavior (the sub-queries the model generates behind the scenes before composing a response) was no longer visible.
A German SEO publication, SEO Südwest, published a detailed account on March 7, noting that researchers…

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