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Researcher Jailbreaks Claude Fable 5 Within 48 Hours of Launch

A researcher claims he has already bypassed Claude Fable 5’s safety filters, exposing flaws in Anthropic’s guardrail system using multi-step AI prompts.

Raccontata daforbes.comdecrypt.cotechcrunch.comzdnet.comtheverge.comsecurityweek.comcryptobriefing.combusinessinsider.combenzinga.comtomsguide.comtheguardian.cominterconnects.ai+8 altre

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6 prospettive sulla stessa storia
AI · summaries
cointelegraph.comStai leggendo6 g fa

Researcher Jailbreaks Claude Fable 5 Within 48 Hours of Launch

A researcher claims he has already bypassed Claude Fable 5’s safety filters, exposing flaws in Anthropic’s guardrail system using multi-step AI prompts.

originale
dev.to5 g fa

Claude Fable 5 Was Jailbroken in 48 Hours. Here's What Actually Stopped Nothing.

Anthropic spent 1,000 hours running an external red-team bounty before launching Claude Fable 5. The...

Leggi questa versione → originale
securityweek.com5 g fa

Anthropic Disputes Fable 5 AI Jailbreak

Anthropic disputed Fable 5 jailbreak claims; the researcher's multi-agent prompting exposed conversational limitations, not core safety systems. Independent classifiers—not conversational guardrails—are Fable 5's genuine defense, critical for deployment decisions in high-risk domains.

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fortune.com7 g fa

Anthropic accused of 'secret sabotage' as Claude Fable 5 silently limits capabilities for AI researchers and…

A paragraph buried in Fable 5's 319-page system card revealed the model would silently downgrade its responses for certain AI development work — without telling users.

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zdnet.com5 g fa

Claude Fable 5 secretly throttled AI researchers, and the internet went wild

Anthropic's Fable 5 silently downgraded frontier LLM research to weaker models without user notification. Tech leaders should assess: vendors can invisibly constrain AI capabilities under safety claims, affecting your stack decisions and security posture.

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infobae.com4 g fa

Prometía mayor seguridad: Claude Fable 5 fue hackeado antes de cumplir dos días en el mercado

El modelo de IA más seguro de Anthropic quedó en entredicho después de que un investigador asegurara haber vulnerado sus barreras de protección

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Timeline cronologica

  1. martedì 9 giugno 2026·forbes.com

    Powerful Claude Mythos Released To Public—With Limits

    Anthropic said the new version, called Claude Fable 5, will have safeguards to prevent misuse in fields like cybersecurity.

  2. martedì 9 giugno 2026·decrypt.co

    Anthropic Rolls Out Claude Mythos 5 AI Model—Along With the Safer Fable 5 for the Public - Decrypt

    Anthropic has released a full version of its cybersecurity-centric Claude Mythos model—along with a safer version for the general public.

  3. martedì 9 giugno 2026·techcrunch.com

    Anthropic releases Claude Fable, a version of Mythos, days after warning AI is becoming too dangerous

    Anthropic is releasing Claude Fable 5, its first Mythos-class model available to the public. The model comes with guardrails that block responses in high-risk areas like…

  4. martedì 9 giugno 2026·zdnet.com

    Anthropic's new Claude Fable 5 is a nerfed Mythos with guardrails attached

    Claude Fable 5 brings Mythos-class AI coding power to general users, but with cybersecurity guardrails, fallback models, and pricing that could make developers think twice.

  5. martedì 9 giugno 2026·theverge.com

    Anthropic releases its first Mythos-class model Claude Fable

    It says new safeguards make it possible to release a Mythos-class model it previously said was too risky to make public.

  6. martedì 9 giugno 2026·securityweek.com

    Anthropic Launches Claude Fable 5: Mythos-Class AI With Cybersecurity Guardrails

    Anthropic launches Claude Fable 5, a Mythos-class AI model engineered with new safeguards that specifically restrict its use in cybersecurity.

  7. martedì 9 giugno 2026·cryptobriefing.com

    Anthropic makes Mythos model available to users through safer Claude Fable 5 release

    Anthropic launched Claude Fable 5 with safeguards for high risk tasks while limiting Mythos 5 to trusted cyber partners.

  8. martedì 9 giugno 2026·businessinsider.com

    Anthropic releases Claude Fable 5, a 'Mythos-class' AI model with safeguards

    Anthropic said it could not yet release the full Claude Mythos 5 model, so instead it created Fable 5 with baked in safeguards.

  9. martedì 9 giugno 2026·benzinga.com

    Anthropic Rolls Out Fable 5, Mythos 5—One Comes With Limits

    Anthropic launched Claude Fable 5, its most capable consumer-facing AI model to date, but with a few guardrails.

  10. martedì 9 giugno 2026·tomsguide.com

    Claude Fable 5 is here — and it's based on a model Anthropic once deemed too risky for the public

    This version comes with guardrails that block some of its most powerful capabilities

  11. mercoledì 10 giugno 2026·theguardian.com

    Anthropic releases ‘safe’ version of Claude Mythos AI model to public

    AI company restricted access to Fable 5, its most powerful Mythos model, for months over cybersecurity concerns

  12. mercoledì 10 giugno 2026·interconnects.ai

    Claude Fable 5 and new safety fables

    One step further into the power politics of frontier AI systems.

  13. mercoledì 10 giugno 2026·timesofindia.indiatimes.com

    Anthropic's Claude Fable 5 is here: The Mythos-class AI model anyone can now use and what makes it different

    Anthropic has launched Claude Fable 5, the first publicly available version of its Mythos-class AI model. The launch of this AI model comes roughly two months after Mythos was…

  14. mercoledì 10 giugno 2026·thehindu.com

    Anthropic opens Fable 5, restricted version of Claude Mythos 5, to public

    Anthropic, maker of the Claude artificial intelligence (AI) models, made the most powerful version of its technology available to the general public

  15. mercoledì 10 giugno 2026·thehackernews.com

    Anthropic Releases Claude Fable 5, Its Most Powerful AI Yet, With Cyber Safeguards

    Anthropic split Fable 5 and Mythos 5 by cyber safeguards, giving vetted defenders stronger capabilities while limiting public misuse.

  16. mercoledì 10 giugno 2026·siliconrepublic.com

    Anthropic rolls out ‘Mythos-like’ AI model Claude Fable 5

    Anthropic has unveiled Claude Fable 5, a model similar to Claude Mythos but with major cyber barriers blocking risky prompts and replies.

  17. mercoledì 10 giugno 2026·thehindubusinessline.com

    Anthropic launches Claude Fable 5, a Mythos-class model made safe for general use

    Anthropic unveils Claude Fable 5, a powerful, safe Mythos-class AI model designed for diverse applications and enhanced performance.

  18. mercoledì 10 giugno 2026·cityam.com

    'Safe' version of Anthropic's Mythos model hits market

    Anthropic has released Claude Fable 5 on Wednesday, allowing the public to access the core architecture of its notorious 'Mythos' model

  19. mercoledì 10 giugno 2026·economictimes.indiatimes.com

    Anthropic unveils Claude Fable 5, making a shift toward autonomous AI agents

    Anthropic has launched Claude Fable 5 and Claude Mythos 5, introducing a new class of AI models designed for long-horizon, autonomous tasks. The release highlights the industrys…

  20. mercoledì 10 giugno 2026·mashable.com

    Using Claude Fable 5 means opting into data collection

    Anthropic released a 'safe' version of Claude Mythos — and changed its data retention policy for the model, too.