Anthropic says Fable 5 uses conservative safety classifiers that trigger a fallback to Claude Opus 4.8 in ~5% of sessions, in areas like cybersecurity (Anthropic)

<a href="https://www.anthropic.com/news/claude-fable-5-mythos-5"><img align="RIGHT" border="0" hspace="4" src="http://www.techmeme.com/260609/i31.jpg" vspace="4" /></a> <p><a href="https://www.techmeme.com/260609/p31#a260609p31" title="Techmeme permalink"><img height="12" src="http://www.techmeme.com/img/pml.png" style="border: none; padding: 0; margin: 0;" width="11" /></a> <a href="https://www.anthropic.com/">Anthropic</a>:<br /> <span style="font-size: 1.3em;"><b><a href="https://www.anthropic.com/news/claude-fable-5-mythos-5">Anthropic says Fable 5 uses conservative safety classifiers that trigger a fallback to Claude Opus 4.8 in ~5% of sessions, in areas like cybersecurity</a></b></span>&nbsp; &mdash;&nbsp; Today we're launching Claude Fable 5: a Mythos-class1 model that we've made safe for general use.&nbsp; &mdash;&nbsp; Fable 5's capabilities exceed &hellip; </p>