TL;DR: SISTRIX data shows that citation patterns in ChatGPT's German-language responses changed after the introduction of GPT-5.5, comparable to a core algorithm update.
Summary: SISTRIX analyzed German-language ChatGPT responses and found distinct shifts in citation behavior following the appearance of GPT-5.5. The company likens the change to a core update, suggesting the new model version significantly impacts how citations are generated.
Why it matters: For AI builders using ChatGPT for research or content generation, citation reliability may shift with model updates. Monitor citation patterns after each version change and consider adjusting verification workflows to maintain accuracy.
Source: searchenginejournal.com