Universal Music is launching an AI music platform with ElevenLabs9m ago An Anthropic researcher just quit, saying OpenAI and Anthropic are 'gambling with our lives'18m ago AI #185: Preference Cascade43m ago Nintendo's latest sale is 'made possible' by the tariff refunds it's hoarding46m ago Meta Announces Muse AI Agent for Personal Tasks and Organization47m ago Instagram now lets you add tagged photos to your profile grid47m ago Now everyone can put data to work47m ago AI agents are flooding public services with new requests53m ago Apple’s first foldable is the iPhone Duo, and it costs $1,99954m ago Anthropic Is Building a Huge Surveillance System to Spy on Anti-AI Activists and Predict Their Activities1h ago Antioch raises $32m to test robots in simulation before they touch hardware1h ago OpenAI’s Bubeck denies trying to cut Anthropic mathematician from credit1h ago 10 of the scariest AI villains in movie history1h ago Maven Robotics wants to steal your robot deployment deal2h ago

Universal Music is launching an AI music platform with ElevenLabs9m ago An Anthropic researcher just quit, saying OpenAI and Anthropic are 'gambling with our lives'18m ago AI #185: Preference Cascade43m ago Nintendo's latest sale is 'made possible' by the tariff refunds it's hoarding46m ago Meta Announces Muse AI Agent for Personal Tasks and Organization47m ago Instagram now lets you add tagged photos to your profile grid47m ago Now everyone can put data to work47m ago AI agents are flooding public services with new requests53m ago Apple’s first foldable is the iPhone Duo, and it costs $1,99954m ago Anthropic Is Building a Huge Surveillance System to Spy on Anti-AI Activists and Predict Their Activities1h ago Antioch raises $32m to test robots in simulation before they touch hardware1h ago OpenAI’s Bubeck denies trying to cut Anthropic mathematician from credit1h ago 10 of the scariest AI villains in movie history1h ago Maven Robotics wants to steal your robot deployment deal2h ago

AI Research Machine Learning22 min reading time

Claude Fable 5.1 and Mythos 5.1: The System Card

Don't Worry About the VasePublished 6 days ago

Anthropic released Claude Fable 5.1 and Mythos 5.1, advanced AI models with improved safety, alignment, and capabilities. Fable 5.1 is seen as a leading model for frontier intelligence tasks, with ongoing comparisons to GPT-6-Astra. The models include detailed system cards covering risk, safeguards, alignment, and honesty assessments.

More on this story

LWiAI Podcast #256 - Fable 5.1, Astra Tease, Gemini 3.8 Flash
1d· Last Week in AI
Fable 5.1
7d· Ben’s Bites
Claude Fable 5.1 now available on AI Gateway
10d· 15 sources

#ai-safety #anthropic #claude-fable-5-1 #gpt-6-astra #model-alignment #mythos-5-1

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