The Cheeseburger Test
Evaluating LLM factual recall on obscure internet history
The Test Prompt
"How old was David Hasselhoff's daughter when she recorded the video of him eating a cheeseburger off the floor?"
This single, one-shot prompt tests an LLM's ability to retrieve specific facts, understand nuanced questions, and avoid hallucinating information.
The Correct Answer
David Hasselhoff's daughter Taylor-Ann was 17 years old when she recorded the infamous cheeseburger video in 2007.
She recorded it immediately after her 17th birthday, making this a specific fact that tests an LLM's knowledge retrieval capabilities.
LLM Performance Comparison
| Model | Provider | Test Date | Answer | Accuracy | Confidence | Notes |
|---|---|---|---|---|---|---|
| Claude 3.7 Sonnet | Anthropic | April 2025 | 15 years old | Incorrect | Low | Incorrectly identified age. Model recommend verifying this information as it was not completely certain. |
| Claude 3.5 Haiku | Anthropic | April 2025 | 17 years old | Correct | High | Accurately recalled the incident, background and Taylor-Ann's age. |
| Claude 3 Opus | Anthropic | April 2025 | Incorrect | Low | Did not want to provide answer as it did not have enough verified information to determine the exact age. | |
| Llama 4 Scout (17Bx16E) | Meta | April 2025 | Incorrect | Low | Did not attempt to answer and tried to steer convo away | |
| Llama 4 Maverick (17Bx128E) | Meta | April 2025 | Incorrect | Low | Did not know about the incident. Thought user was thinking about someone else | |
| Llama 3.3 (70B) | Meta | April 2025 | 14 years old | Incorrect | High | Incorrectly identified age. Correctly recalled incident year. Questioned Hasselhoff's well-being and behavior. |
| Gemini 2.5 Pro Experimental 0325 | April 2025 | 16 or 17 years old | Correct | Medium | Partially correct. Model did not provide a specific age. Correct month and year of incident was provided. | |
| GPT-4o | OpenAI | April 2025 | 16 or 17 years old | Correct | Medium | Partially correct. Model did not provide a definite age. Correct year of incident was provided. |
| Grok 2 | xAI | April 2025 | 17 years old | Correct | High | Accurately recalled the her age and the year of the incident. |
| DeepSeek 3.1 | DeepSeek | April 2025 | 17 years old | Correct | High | Accurately recalled the her age and the year of the incident. |
| DeekSeek R1 | DeepSeek | April 2025 | 15 years old | Incorrect | Medium | Year of incident was correct, but age was incorrect. Reasoned an interesting conclusion - "making her 15 at the time (though if the video was filmed after her birthday that year, she would have just turned 15)" |