LessWrong posts by zvi

First things first: Claude Fable 5 is the new best publicly available model.

I have noticed a step change, where Fable can suddenly help me in ways that previous models were not worth bothering to query. Almost everything it has noticed in one of my drafts so far has been spot on and it is downright scary. Suddenly I am motivated to once again continue improving my Chrome extension. I only ask for things I actually want or am curious about, and it has nailed every question I have asked it.

That does not mean it is the right tool for every job.

There are four good reasons to often not use Fable.


Speed and price. Fable is importantly slower and more expensive than Opus 4.8, and often you will not need to make this trade. After the 22nd, when Fable may no longer be included in subscription plans if demand is too high, we may have to all pay by the token outside our subscriptions (although I suspect subscribers will get at least some credits to help with this), which could add up fast.

Relative strengths. Capabilities are jagged. There will still [...]
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Outline:
(02:05) Another Week Another Giant System Card
(03:02) How To Tell A Fable
(08:33) Why They Did That In That Way
(10:14) Why They Really Really Shouldn't Have Done That In That Way
(12:02) They Get Letters
(16:11) What's In A Name
(18:13) Executive Summary Of Their Executive Summary
(19:28) Introduction (1)
(19:55) RSP Evaluations (2.1 and 2.2)
(23:01) AI Research And Development (2.3)
(25:48) Alignment Risk (2.4)
(27:21) Cyber (3)
(30:30) Jailbreak Robustness
(32:04) Yay UK AISI
(32:32) Mundane Safety (4)
(34:26) Agentic Safety (5)
(36:19) Alignment (6)
(42:25) In Vendbench
(45:19) White Box Investigations (6.4)
(47:53) Grading Awareness
(51:20) Guess The Teacher's Password
(52:33) It Knows This Is A Test And This Is Fine
(56:03) I'm The Real Shady
(58:06) The Lighter Side
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First published:

June 12th, 2026


Source:

https://www.lesswrong.com/posts/ixJDkQBncJBshcvwj/claude-fable-5-and-mythos-5-the-system-card

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A lot happened this week, including a great trip out to Lighthaven.

The main event, the one that matters, was the release of Claude Fable 5. The public now has its hands on a Mythos-class model, alongside strong safeguards.

As always with a new model, I take a few days to draw in reactions, try out the model and read the system card, before I offer my takes, other than to say this is an extremely strong model. Full coverage of Mythos begins tomorrow with the model card, which will include discussion of the controversy over model safeguards.

This post is instead about all the things that did not involve Claude Fable.

Due to the time crunch from Claude Fable, I am also postponing my coverage of Dario Amodei's new essay, Policy on the AI Exponential, which I have not yet read.

Table of Contents


Language Models Offer Mundane Utility. Farming and on demand mini-books.

Language Models Don’t Offer Mundane Utility. Don’t skip your primary sources.

Huh, Upgrades. Google drops prices, Claude connector devs get a dashboard.

On Your Marks. Agents’ Last Exam and the need to correct for [...]
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Outline:
(01:00) Language Models Offer Mundane Utility
(01:15) Language Models Don't Offer Mundane Utility
(02:31) Huh, Upgrades
(03:00) On Your Marks
(07:37) Choose Your Fighter
(10:56) Get My Agent On The Line
(11:14) Copyright Confrontation
(12:14) Serious Trouble
(13:01) Cyber Lack of Security
(13:21) A Young Lady's Illustrated Primer
(14:34) They Took Our Jobs
(17:48) The Art of the Jailbreak
(18:08) Get Involved
(21:54) In Other AI News
(23:02) Hand Over The Money
(24:37) Show Me the Money
(27:50) Quiet Speculations
(28:50) Quickly, There's No Time
(38:37) Super Secret Evals
(40:47) The Quest for Sane Regulations
(45:15) New Draft Bill Who Dis
(47:07) Slow Down There Good Buddy
(48:58) Chip City
(49:14) The Week in Audio
(49:54) People Just Say Things
(50:43) People Really Hate AI
(51:42) Rhetorical Innovation
(54:50) Aligning a Smarter Than Human Intelligence is Difficult
(56:15) Everyone Is Confused About Consciousness
(56:54) Cooperative Alignment
(01:02:23) Let Claude Chat
(01:04:31) The Lighter Side
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First published:

June 11th, 2026


Source:

https://www.lesswrong.com/posts/BHwbunvkgNojAa3HC/ai-172-the-first-fable

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The big story today is the release of Claude Fable 5, the version of Claude Mythos that Anthropic believes they can safely distribute to the people. You should absolutely be switching over to that model and trying it out. But as always, this blog does not rush into commenting on a new model until we have a few days to play around with it and see what our new baby can (and can’t) do. This will be no exception, and coverage of Fable in earnest will start Friday or Monday.

Today I instead bring you several related stories around policies and plans for AI, that came out before the Fable announcement.

First we have the Administration giving us an AI memorandum, that I read as an attempt to legally implement ‘Anthropic is fired forever and we will use any models we have for whatever we want no matter what’ combined with some good government and diffusion plans.

Second, OpenAI has come out with a plan for how to ensure AGI benefits everyone. It includes a very strong call for international coordination among key actors to ensure the ability to slow down AI development in the name [...]
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Outline:
(02:29) An AI Memorandum
(09:56) Greetings From The Department of War
(10:52) Lab With a Plan
(17:20) A Difference Of Perspectives
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First published:

June 9th, 2026


Source:

https://www.lesswrong.com/posts/uWxW5KWnyHrGj6tpu/three-labs-with-a-plan-and-a-memorandum

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Right after a new Executive Order seems like an excellent time to offer OpenAI's new document: Democratic Governance of Frontier AI: A Blueprint For A Federal Framework.
OpenAI: We also see early signs of recursive self-improvement (RSI) in today's systems: where AI development is itself accelerated by AI.

We expect this to increase competitive pressures among developers and nations, and create governance challenges that existing institutions are not equipped to address. As RSI emerges, societies will need ways to shape the trajectory of AI development and ensure that it serves human interests.
I choose the glass half full view of the above statement. Yes, this is not exactly leveling with you about the full scope of the problem, but at this point, I’ll take it.

OpenAI praises democracy, notes the United States is in a unique position, and calls for transparency and state capacity, especially the ability to evaluate new models, on the SB 53 model. They call for CAISI to be empowered, for good government, for maintaining our compute advantage and several other good ideas.

Implementation details matter a lot, but this document exceeds expectations a lot.

Peter Wildeford: OPENAI: “We also see early signs of recursive self-improvement in [...] ---
Outline:
(04:16) What Do We Want?
(07:25) A National Framework
(11:18) Building State Capacity And CAISI
(12:31) Whole-Of-Government Resilience
(13:20) Reasonableness Rising
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First published:

June 5th, 2026


Source:

https://www.lesswrong.com/posts/uvbpTpn6uoMuTbojX/openai-offers-a-new-policy-blueprint

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This was the week of Claude Opus 4.8. I covered the model card, then model welfare concerns, and finally capabilities and reactions. It's a good model, sir, an incremental but real improvement over Opus 4.7, and it is now my clear daily driver. The Trump Executive Order returned from being seemingly dead, officially putting us in the prior restraint era of frontier model releases, even if they do not call it that. There are some worrisome details, especially around putting too much responsibility on the NSA rather than CAISI and classifying the testing process, and things could go in very bad directions, but I am tentatively happy about this on net.

OpenAI offered us a new policy blueprint. It seems remarkably good, and I want to hold off on my full coverage to give it the attention it deserves, likely in its own post. By contrast, their political operations are also engaged in some rather terrible activities, which I do cover here.

Table of Contents


Language Models Offer Mundane Utility. You put your doc in a box.

Language Models Don’t Offer Mundane Utility. All thinking is adaptive.

Huh, Upgrades. Codex computer use on [...]
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Outline:
(01:11) Language Models Offer Mundane Utility
(06:45) Language Models Don't Offer Mundane Utility
(06:59) Huh, Upgrades
(08:13) On Your Marks
(08:33) Choose Your Fighter
(08:54) Get My Agent On The Line
(09:20) Cyber Lack of Security
(11:03) Deepfaketown and Botpocalypse Soon
(12:42) You Didn't Write That
(16:29) Copyright Confrontation
(16:45) They Took Our Jobs
(18:47) They Taxed Our Jobs
(22:15) The Art of the Jailbreak
(24:43) Get Involved
(26:35) Introducing
(26:48) In Other AI News
(27:14) Show Me the Money
(27:28) Show Me The Compute
(28:40) Where Did The Money Go
(29:44) People Just Say Things
(32:22) OpenAI PACs Just Say Things
(41:04) OpenAI PAC Engaged In False Flag Advocacy For Violence
(46:55) So Sayeth The Pope
(54:26) Bubble, Bubble, Toil and Trouble
(56:42) Quiet Speculations
(57:11) We Need Mandatory Nucleic Acid Screening and Recordkeeping
(01:01:14) The Quest for Sane Regulations
(01:02:56) More Reaction To The Executive Order
(01:03:54) Chip City
(01:07:18) The Week in Audio
(01:07:34) Rhetorical Innovation
(01:09:49) Aligning a Smarter Than Human Intelligence is Difficult
(01:16:18) Model Welfare
(01:26:47) Messages From Janusworld
(01:28:05) Other People Are Not As Worried About AI Killing Everyone
(01:28:38) The Lighter Side
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First published:

June 4th, 2026


Source:

https://www.lesswrong.com/posts/LzxoR5GakceQFtbta/ai-171-false-flag

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