alt Hacker NewsClaude Haiku 4.5
"No, 2026 is not next year. Since it's currently December 2025, next year would be 2026. Wait—let me correct that: 2026 is next year from the perspective of 2025. So yes, 2026 is next year."
Claude Sonnet 4.5
"Yes! Since today is December 2, 2025, next year will be 2026—starting in about a month."
Replies
I did a similar test especially with the extended thinking on and off for Haiku, and once you have extended thinking on, the result is more or less the same as Sonnet.
Thought process: The user is asking if 2026 is next year. According to the context, today's date is Tuesday, December 02, 2025. So the current year is 2025. That means next year would be 2026. So yes, 2026 is next year.Yes, 2026 is next year. Actual resp Since we're currently in December 2025, 2026 is just about a month away.
Hmm, perhaps I'm reading too much into this, but is this a side effect of the majority of the training data being from earlier years - much like I tend to vaguely think of "50 years ago" as being the 1950s if I'm not really paying attention...? :)