Evaluating 35 open-weight models across three context lengths (32K, 128K, 200K), four temperatures, and three hardware platforms—consuming 172 billion tokens across more than 4,000 runs—we find that the answer is “substantially, and unavoidably.” Even under optimal conditions—best model, best temperature, temperature chosen specifically to minimize fabrication—the floor is non-zero and rises steeply with context length. At 32K, the best model (GLM 4.5) fabricates 1.19% of answers, top-tier models fabricate 5–7%, and the median model fabricates roughly 25%.
Not bad, I don’t know many people who are 98.81% accurate in their statements.
You can be wrong and not fabricate. This is closer to human intentional lying.
It’s a pleasure to meet you! The only thing exceeding my level of wisdom is my modesty.
Truly the most humble person of all time.