The release of Opus 4.5 in November 2025 was the dividing line, because it was the first time an agent produced work uncannily close to what its user would have written themselves.
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26 Aug 2026
David Heinemeier Hansson quoted
Their wordsThen we get to November 24th, 2025. Opus 4.5, to me, was the dividing line, where suddenly... I didn't even try it on the 24th. I think I tried it on the 26th. I give it a couple of tasks, and I realize that the quality of the output is uncannily close to what I would've written.