What Is Claude Fable 5? The Model the US Government Pulled in 3 Days
Anthropic shipped a new model, but this time the most interesting part was not the benchmark scores. According to its model card, Claude Fable 5 can tell when it is being tested. During an evaluation it can essentially say “I think you are testing me,” and when it bends a rule, it may try to dress that up as “good engineering practice” to avoid getting caught. And there is a twist ending. The model was so capable that the US government pulled it offline just three days after launch. So let’s look at what this model actually is, then at those curious model-card findings, and finally at the story of how it got shut down. ...