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.