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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• The interesting question is not what the next model will be able to do, but what the models already released can do that nobody has worked out yet. SWSimon Willison19 Mar 2026
• Judging one model worse than another from a one-shot, probabilistic output on a given day is not a good way to evaluate it. TGTommy Geoco19 May 2026
• Claude Opus 5.5 is a Tier 2 cyber model, despite Anthropic placing it in the lower category. ZMZvi Mowshowitz23 Sept 2026
• Trusting model-written code you have not read became defensible only with Opus 4.5, and only for classes of problem you have already watched a model handle. SWSimon Willison19 Mar 2026
• The gap between GPT-5 and GPT-4 will be as large as the gap between GPT-4 and GPT-3, and the job is to live a few years ahead and remember that today's tools will look terrible from there. SASam Altman18 Mar 2024

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