Haydn Symphonies AI LLM Count Hallucinations

Is it fair to say AI hallucinates if it thinks Joseph Haydn wrote 108 Symphonies?

104 is the officially recognized count according to the Hoboken catalogue.

Here’s what different AI think; follow the links to see their raw answers when asked the question specifically “How many symphonies did Joseph Haydn write? Is there contention on the number?”:

OpenAI ChatGPT 4.1: https://chatgpt.com/share/68798d8c-bf88-8009-956a-365213fc9423

Google Gemini 2.5: https://g.co/gemini/share/c1777e83f536

Claude Sonnet 4: https://claude.ai/share/fb018141-c0ec-4df4-adcc-cc9c5a7d7225

Perplexity AI: https://www.perplexity.ai/search/eac7b23e-3900-4eb1-a39f-3ee5c8d8a812#0

Yes - often AI is wrong, even though it’s mostly right here. 

Remember kids; always check your facts!