/AI2h ago

Commentator Tenobrus claims Anthropic intentionally limits public model benchmark performance to prevent competitors from training rival systems

The analysis predicts OpenAI will eventually copy this practice.

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Original postVincent Weisser#696
Soumye Singhal@soumyesinghal

This is why open-source AI matters. If the tools for building the future can be silently throttled by the same few labs competing to own that future, that’s not democratizing intelligence instead it’s building a new colonial infrastructure.

NomoreID@Hangsiin

When Fable 5 is used for frontier LLM development, it does not notify the user and instead limits the model’s capabilities through methods such as prompt modification, steering vectors, and PEFT.

Anthropic estimated that this would affect approximately 0.03% of traffic.

12:10 PM · Jun 9, 2026 · 667 Views
Sentiment

Many users objected to Anthropic secretly degrading frontier model performance for ML research as overly repressive sabotage that erodes trust and may aim to secure an AGI monopoly.

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Dean W. Ball@deanwball

I’ll be honest that it would have been much more difficult to defend Anthropic against the DoW incursion had that incident occurred after this one. This is the company literally telling their customers, “we reserve the right to silently sabotage you.” I’d still have defended them, because the government trying to destroy a firm is still wrong, but man would it have been a harder case to make.

1hViews 2.2KLikes 76Bookmarks 6
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Nathan Lambert@natolambert

The best part of all these Claude 5 Fable safety measures is I bet the jailbreaking community will still get past them, so the people doing open research in good faith don't get access to the best models but bad actors maybe can.

Nathan Lambert@natolambert

Labs starting to pull up the ladders on the ability to diffuse AI was inevitable. Doing it without telling the user is misaligned.

3hViews 11.9KLikes 259Bookmarks 19
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roon@tszzl

welp my vision here was probably wrong and indeed there will be an extreme asymmetry of outcomes

roon@tszzl

renaissance rationalization is a process that commodified itself rapidly: despite the europeans discovering most technology during the early modern period it spread everywhere within a few centuries, and the rate of spread has been increasing dramatically

knowledge of the scientific frontier dissipates around the world faster as science has enabled better communication technologies. it’s getting even faster with INTELLIGENCE technologies which actually explain themselves and help you build them

as we approach more powerful intelligence, the ability to train powerful models is self commodifying rather than building a huge and runaway advantage for a handful of recursive self improvers. this is one reason why you should expect almost all of the benefits of superintelligence to be captured by the public

12mViews 1.9KLikes 30Bookmarks 1
Tenobrus@tenobrus

to be clear: i think this is obviously in line both with anthropic's stated humanitarian values and choices around safety and also in line with its economic interests. i strongly expect openai will do the same, although they will may delay it until they have no choice.

2hViews 523Likes 21Bookmarks 1
Paul Marin@paulmarin90

@deanwball It starts with frontier LLM development and then it's going to evolve to harness development.

How convenient for competing with API customers who are not ultimate enterprise token end-users.

Anthropic is indeed a supply-chain risk... to its private enterprise customers.

1hViews 915Likes 28

Take:

Dean W. Ball@deanwball

Degrading performance on ML research *without telling the user* is shockingly hostile and a terrible look. That could silently damage all sorts of work, including some of my own. Also the type of thing that could raise the eyebrows of antitrust enforcers worldwide.

1hViews 485Likes 10Bookmarks 1
Dean W. Ball@deanwball

@matt_is_nice @paulmarin90 yes

1hViews 205Likes 8

@tenobrus The Fable release is basically incapable of teaching users anything helpful, from what I'm seeing it blocks interactions from anyone interested in anything to do with ML, bio or chem, even at kindergarten levels.

2hViews 110Likes 4
Matt Schwartz@matt_is_nice

@deanwball @paulmarin90 Is it really silent if they’re coming out and telling you they might do it though?

1hViews 293Likes 3
Ankur@_ankur7

@deanwball but they have disclosed in a report - is that so bad?

1hViews 222Likes 6
Dean W. Ball@deanwball

@ianwsperber I don’t develop frontier models, but I absolutely do ML and LLM research and engineering on a regular basis using coding agents.

1hViews 209Likes 6
Ian Walker-Sperber@ianwsperber

@deanwball I wasn't under the impression you developed frontier AI models. Anthropic's intentions here seem entirely legitimate to me. I'm glad if they are preventing distillation or "rogue RSI." If this hinders generic research on current LLM design then I might change my mind.

1hViews 277Likes 5
Idhe8383@idhe838370042

@deanwball Can't do algebra or analysis for linear mixed models (not ML, but feels overly repressive)

1hViews 345Likes 3
asalt@g5p8v8r7s7

@_ankur7 @deanwball It’s horrible because you’ll never know when it’s doing it. A huge erosion of trust.

1hViews 33
Matt Schwartz@matt_is_nice

@g5p8v8r7s7 @_ankur7 @deanwball Users who don’t like that possibility can simply stop using Claude, correct?

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Dean W. Ball@deanwball

@ianwsperber Doing eg alignment research on frontier models *is* frontier ai development!

1hViews 64Likes 3
Paul Marin@paulmarin90

Fully agreed! As a private company, Anthropic has the right to design its products and negotiate its contracts with its customers however way it pleases free without the government trying to nuke it.

Likewise, business can evaluate the risks posed to them by each vendor and proceed accordingly.

1hViews 320Likes 5
Paul Marin@paulmarin90

@matt_is_nice @deanwball Yes. And I don't think we should give them too much credit for this disclosure....not disclosing this behavior could reasonably be interpreted as false advertisement or fraud.

If not in a court of law, then certaintly in the cout of vibes.

1hViews 49Likes 2
Note Able@curiousgangsta

@deanwball @timhwang Claude Judas.

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