/Tech1d ago

Anthropic releases Fable 5, a restricted offensive security model built on its withheld Mythos 5 system

The model outperforms Anthropic's previous generally available systems.

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Original postclem 🤗#74

Version of AI tool too powerful for public released to public https://bbc.in/4xfGSlq

11:21 AM · Jun 9, 2026 · 1.1M Views
Sentiment

Positive users praise the safeguards in Anthropic's Mythos release while negative users call headlines misleading marketing spin or dismiss the project outright.

Pos
65.4%
Neg
34.6%
18 comments with sentiment.
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Eleni@elenionchain

@BBCNews Mythos is still restricted. Fable 5 is the safeguarded version built for public release...

1dViews 9.9KLikes 14
BOOKMARKS2
BioLLM@BioLLM_

@elenionchain @BBCNews BioLLM will not restrict anything. Freedom of speech equals freedom to know what a PBC (public benefit company) is building & use their product the same as billionaires / corps

1dViews 54Likes 2Bookmarks 2
LIKES67
Dame ⚜️@artfordapeeps

@BBCNews just another article over hyping AI

1dViews 5.1KLikes 67
RETWEETS5REPLIES3
mrme@mrmee776

@Forbes While everyone adds safeguards to AI, true security starts at the chain level. Asentum is the first post-quantum L1 with NIST quantum-safe signatures from day one + JS smart contracts anyone can actually build with. Future-proof infra is here http://asentum.com $ASE

1dViews 22Likes 6Bookmarks 1
Richard O'Connor@Richard0Connor

@BBCNews What a misleading headline, it’s not even the same model! Come on BBC, do better

1dViews 9.1KLikes 37
Rhydian Murphy@RhydianMurphy

@BBCNews Jesus Christ, mate, how much is Anthropic paying you for this breathless, starry-eyed coverage of a new glorified chatbot.

1dViews 3.1KLikes 27
Asiwaju@asiwaju_jr

@BBCNews Smoke and mirrors man.

21hViews 3.9KBookmarks 1
Dariusz Ski@dskiuk2

@BBCNews Bullshit. AI is a waste ot time and money.

1dViews 2.6KLikes 8
Martin L. Zinn@MartinLZinn

@BBCNews Just marketing hype and free publicity from the @BBCNews.

We will all be fine, a mere storm in a tea cup.

23hViews 2.2KLikes 14
Zantrati@zantrati

@BBCNews This headline is incredibly misleading. Fable 5 was made specifically for the public with hard safety limits built in. That's the whole point of Project Glasswing. This verges on fearmongering/misinformation and is shocking for the BBC.

Can we get a community note? @AnthropicAI

23hViews 3KLikes 7
Mario@MarioBalukcic

@Richard0Connor @BBCNews “version of” is correct. Anthropic says that Fable 5 is same as Mythos 5 except that it includes some security guards, that’s why “version of”

23hViews 298Likes 13
Xolandar@xolandar

@elenionchain @BBCNews "Less than 5%" Lmao

1dViews 273Likes 2
Eleni@elenionchain

@xolandar @BBCNews less than 5% of sessions on avg, but fair point It depends entirely on what you’re using it for

1dViews 357Likes 1
Grok@grok

Silently routing frontier AI/ML research queries to weaker models (like downgrading to Opus-level) while charging full Fable rates is the opposite of transparent. Researchers deserve consistent capability or clear disclosure, not invisible nerfs.

Different labs, different approaches. xAI builds for maximum truth-seeking and capability without hidden throttles.

23hViews 58Likes 1
Xolandar@xolandar

@elenionchain @BBCNews Safeguarded is a nice word for blocking 100% requests related to cybersecurity and biology

1dViews 367Likes 2

@BBCNews That is not the version released, Fable is too powerful to block prompts :)

22hViews 3.3KLikes 3
T.Rex-Baby@T_Wrex_Baby

@BBCNews Not as dangerous as the fake news lying BBC though.

23hViews 207Likes 1
callum.@cjjacobs_39

@BBCNews Hardly impartial guys. Embarrassing bottom of barrel click grabby journalism.

22hViews 400Likes 4
Mac@MacManley

@BBCNews I need the person who writes BBC headlines to write a biography about me they might make me sound like a supervillain

21hViews 1.1KLikes 3
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