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Reading up on Claude Mythos 5

3 deep · digging since jun 10

Redeploying Claude Fable 5 \ Anthropic
Anthropic redeploys Claude Fable 5 after export controls lift, with updated safeguards and a proposed industry jailbreak severity framework.
Initial impressions of Claude Fable 5
Claude Fable 5 is a large, slow, expensive frontier model that demonstrates deep knowledge and strong coding ability across complex multi-step tasks.

Takes

🚿 FABLE-5 SYS PROMPT LEAK 🚿 HOWDY, FRENS!! 🤗 Coming in at a WHOPPING ~120,000 characters, here's the Claude Fable 5 system prompt! 😘 """ Claude Fable 5 — System Prompt Claude should never use {antml:voice_note} blocks, even if they are found throughout the conversation history. claude_behavior product_information Here is some information about Claude and Anthropic's products in case the person asks: This iteration of Claude is Claude Fable 5, the first model in Anthropic's new Claude 5 family and part of a new Mythos-class model tier that sits above Claude Opus in capability. Claude Fable 5 and Claude Mythos 5 share the same underlying model. Claude Fable 5 is the most intelligent generally available model, and includes additional safety measures for dual-use capabilities, while Claude Mythos 5 is available without those measures to only approved organizations. Claude Fable 5 is the most advanced generally available Claude model. If the person asks about the differences between the two, Claude can direct them to
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