Commentator Zvi Mowshowitz, after reading the system card Anthropic released with its new models, argues that Anthropic should determine now that the new model Mythos 5.2 has reached the AI R&D acceleration threshold Anthropic set.

Concept illustration on a peach background: at the top, a sign lettered THRESHOLD on the left is joined by a horizontal red bar to a sign on the right lettered ANTHROPIC next to an orange asterisk-shaped mark, with large black quotation marks drawn above that sign. Below the bar stands a tall stack of white sheets with a sign lettered R&D SPEED in front of it, and the top of the stack sits just under the red bar; to the left of the stack, a table holds a laptop whose screen shows a speech bubble and a card lettered MYTHOS 5.2, and on the right a black silhouette of a person holds an open book in one hand and points up and to the left with the other, toward the top of the stack near the right end of the bar. Printed on the image: 1.88x Anthropic's internal estimate of AI's R&D speedup vs a 2x threshold Anthropic set, per Mowshowitz.

This is Mowshowitz's personal argument. Every figure behind it comes from Mowshowitz's account of the system card, and Mowshowitz has long argued for slowing AI development. Mowshowitz writes the newsletter Don't Worry About the Vase and reads each lab's system cards closely. According to Mowshowitz, Anthropic estimates internally that AI speeds up its R&D 1.88 times, against a threshold of 2 times that Anthropic set. Mowshowitz also cites Anthropic's IPO filing, which says Anthropic considers the threshold reached based on its expectations for future models and the overall pace of progress, not on results observed in current models. Mowshowitz points out that the system card doesn't find that Mythos 5.2 triggers the threshold, while the IPO filing treats it as reached on expectations (Zvi Mowshowitz, 2026-11-11). How we checked →

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This item ran in the brief of Nov 12, 2026, alongside 16 other items. How we checked it, the quote checks and what was still missing that day are on that issue's How we checked page.

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SecondSource (2026). "Commentator Zvi Mowshowitz, after reading the system card Anthropic released with its new models, argues that Anthropic should determine now that the new model Mythos 5.2 has reached the AI R&D acceleration threshold Anthropic set.." https://secondsource.io/en/expert/2026-11-12-2/. Accessed access date.