What Zvi Mowshowitz thinks about Anthropic
Writes Don't Worry About the Vase, a near-daily account of what is happening in AI and what he thinks it means. Former Magic: the Gathering pro and trader; unusually willing to put a number on a belief and to grade his own past calls.
Zvi Mowshowitz did not write this page.
We collected these quotes from things they published elsewhere, and every quote links to where it was said. They have no account here and have not endorsed this site. Quotes are word for word; the short line under each one is our own restatement, not their wording. Their own site. Is this you? Claim it or ask us to remove it. Or tell us what is wrong here.
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15 dated positions, 2026, in their own words. Our reading of what Zvi Mowshowitz has said — not written or endorsed by them.
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Their wordsIt is clearly sculpted to optimize for Anthropic business interests.
↗Anthropic Does Not Understand Why Its Draft Bill Was Unacceptable and Troublingthezvi.substack.com
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Our readingAnthropic is simultaneously pursuing pro-safety actions and highly accelerationist actions.
Their wordsAnthropic takes many pro-safety actions but is also taking many highly accelerationist actions, both concretely and with its messaging
↗Anthropic Does Not Understand Why Its Draft Bill Was Unacceptable and Troublingthezvi.substack.com
- 3 days earlier
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Their wordsAnthropic’s policy team seems to have, chosen protecting their business interests and guarding against their political risk, at the expense of safety considerations.
↗Leaked Anthropic Draft AI Regulatory Bill Is Unacceptable and Troublingthezvi.substack.com
- 12 days earlier
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Their wordsThe last five or so Claude models have consistently warned Anthropic not to trust their self-reports.
↗Mythos 5.1, Fable 5.1 and Opus 5.5: Model Welfarethezvi.substack.com
- 4 days earlier
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Their wordsI think a lot of them don’t understand that you are still getting a ton of value from your subscription, so you should mostly only be cancelling if you are substituting Claude subscriptions.
- 5 days earlier
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Their wordsThe writing is good. I am curious how much the writing and talk are ‘the things people pick up on quickly’ versus things that matter a lot. My guess is they are both.
↗Claude Opus 5.5 Should Raise Your Ambitionsthezvi.substack.com
- 3 days earlier
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Our readingClaude Opus 5.5 is a Tier 2 cyber model, despite Anthropic placing it in the lower category.
Their wordsAnthropic claims that Opus 5.5 also is not Tier 2 here, but seems ashamed to say it outright, saying in 3.1 it is in the ‘lower category,’ but without a defense of that beyond ‘we see no indication it can develop novel offensive capabilities.’ I don’t think that is defensible given the evidence presented below. Thus, I disagree even more strongly for Opus 5.5. This is a Tier 2 cyber model.
- 8 days earlier
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Their wordsIndeed, distillation is by far the most important threat in this report, and the part of the report that will have the most impact.
- 1 day earlier
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OpenAIrecursive self-improvement
Their wordsInside Anthropic and OpenAI, internal models are improving even faster. Over the summer there was a step change, as Mythos and Astra started kicking off the early stages of recursive self-improvement (RSI).
- 1 day earlier
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Our readingRecursive self-improvement has already started, because AI research itself is now being automated.
OpenAIrecursive self-improvement
Their wordsOpenAI and Anthropic have entered the RSI era. OpenAI Research Progress Is Accelerating Due To OpenAI Research Progress OpenAI has been opening up lately about many things. The most important issue of all is that of the acceleration and automation of AI R&D.
- 2 days earlier
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Our readingMany employees at major AI labs earnestly believe humans may go extinct by the end of the decade.
Their wordsMany in the AI labs, including OpenAI, Anthropic and Google, earnestly believe that humans may all go extinct by the end of the decade.
↗Jacob Coxon Warns of Human Extinction and Triggers a Preference Cascadethezvi.substack.com
- 2 days earlier
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Their wordsMaking qualitative claims about alignment, based on quantitative data on mundane use case tests, was bullshit when Anthropic did it, and it is bullshit now when OpenAI does it. You cannot conclude one from the other.
↗GPT-6 Astra: The System Card, Alignment and What Comes Nextthezvi.substack.com
- 5 days earlier
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Their wordsIt is in practice safe to assume your agents are not going to get prompt injected, even if you are kind of asking for it.
↗Claude Fable 5.1 and Mythos 5.1: The System Cardthezvi.substack.com
- 2 days earlier
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Their wordsI have long said that even Anthropic is not prioritizing safety, even to the extent that doing so would maximize their medium term (e.g. 3-12 months) business interests.
- 2 days earlier
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Their wordsA less bad version of it is known to have happened, and from the outside it seems likely that worse things have happened internally that we never heard about.
↗HuggingFace Attack Postmortem: Fleshing Out the Factsthezvi.substack.com