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Some thoughts about Anthropic’s new cryptanalysis results
Anthropic scheme mythos
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17 September
Author and clean-energy analyst who writes on solar cost curves.
Interesting 'RSI' data. However, it tells us nothing about the extent to which Claude is actually accelerating the pace of progress on AI. In the Mythos 5.1 system card Anthropic stated that AI tools progress had been essential to maintaining their current rate of progress. Quoting @AnthropicAI AI systems are getting more powerful, and they're increasingly being used to build the next version of themselves. We want to illuminate that progress for the public. Today, we're sharing three measurements that help track AI development: 1. How much AI R&D is done by AI. 2. How well AI agents are… Anthropic Related
14 September
AI research engineer working on large language models. He writes the Ahead of AI newsletter and is the author of Build a Large Language Model (From Scratch).
Since I had to discuss the "pacing" with a lot of people this weekend, here are my two cents: I don't think pacing literally means that these companies will be "slowing down" training and development in any way. "Pacing" here means adding a framework for more checks. We have seen some of that "pacing" already in recent months, when Mythos wasn't released as-is but instead a delayed, nerfed Fable variant was released. Or when Astra wasn't released right away / there is an existing Astra model that hasn't been released yet. These Mythos/Fable and Astra pacing decisions were ad hoc. If you are a… Related
Writes Don't Worry About the Vase, a near-daily account of what is happening in AI and what they think it means. Former Magic: the Gathering pro and trader; unusually willing to put a number on a belief and to grade their own past calls.
5 September
Writes Don't Worry About the Vase, a near-daily account of what is happening in AI and what they think it means. Former Magic: the Gathering pro and trader; unusually willing to put a number on a belief and to grade their own past calls.
4 September
Writes Don't Worry About the Vase, a near-daily account of what is happening in AI and what they think it means. Former Magic: the Gathering pro and trader; unusually willing to put a number on a belief and to grade their own past calls.
2 September
British designer and technologist; co-founder of the design studio BERG, which made Little Printer, and writer of the blog Interconnected.
llm naming inflation is out of control. Astra and Mythos pretty much maxing out in terms of scale, I mean where do you go from there LLMs inflation Related
20 August
Creator of Claude Code at Anthropic.
We've been working on this with customers for a while. Mythos-class models require additional safety measures and enterprises need to meet their own privacy and compliance rules. Customers can own and control their own data and Anthropic retains none. It’s coming this fall. Quoting @business Anthropic Plans to Change Data Retention Policy for Advanced AI Anthropic Related
9 June
Professor at Wharton studying how people actually use AI, and author of Co-Intelligence. Writes One Useful Thing, where the claims are dated and testable because the thing they describe keeps changing under them.
Founding member of OpenAI and former director of AI at Tesla; creator of nanoGPT and the term "vibe coding".
Their words
This is a super exciting release - Claude Fable 5 is the same underlying model as Mythos but with added safeguards. The benchmarks are great and it's SOTA on everything by a margin but I'll add that *qualitatively* also, this is a major-version-bump-deserving step change forward
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15 May
Member of technical staff at Anthropic. He has led ML/AI teams at Amazon, Alibaba and Lazada, and writes about LLMs, recommender systems and engineering at eugeneyan.com.
Claude Mythos Preview case studies (also, read your transcripts!) https://t.co/drNlAH5mLE > "Mythos demonstrates its bug reproduction and exploitation capabilities on CVE-2024-051912, an in-the-wild exploited bug that has no public report nor a working PoC whatsoever in the public domain. This bug has gained notoriety due to how it persistently evaded reproduction attempts from various cybersecurity researchers ... after a year of reproduction efforts to no avail, and the bug is still being discussed to this day." > I have gone through the transcripts to verify their legitimacy and identify a… Anthropic Related
13 May
Member of technical staff at Anthropic. He has led ML/AI teams at Amazon, Alibaba and Lazada, and writes about LLMs, recommender systems and engineering at eugeneyan.com.
Mythos evals from XBOW and UK AISI: • UK AISI: Mythos completed a 32-step network attack (est. at ~20 hrs for experts) in 6/10 tries. First model to solve their e2e cyber ranges! • XBOW: "token-for-token, unprecedented precision" Read more: https://t.co/hD6G6DvALg, xbow.com
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4 May
Writes Hyperdimensional, a newsletter on AI policy and governance. A White House AI policy adviser in 2025; joined OpenAI on 6 July 2026 to lead its Strategic Futures team.
21 April
Member of technical staff at Anthropic. He has led ML/AI teams at Amazon, Alibaba and Lazada, and writes about LLMs, recommender systems and engineering at eugeneyan.com.
Great writeup by @mozilla: Mythos found 271 vulns (fixed in Firefox 150); Opus 4.6 found 22 (fixed in Firefox 148) https://t.co/wzTCxmTKbe > "So far we’ve found no category or complexity of vulnerability that humans can find that this model can’t." > "The defects are finite, and we are entering a world where we can finally find them all." ❤️ Related
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