[{"data":1,"prerenderedAt":13},["ShallowReactive",2],{"$f25hzz5f5p3f28":3},{"id":4,"title":5,"url":6,"sourceId":7,"publishedAt":8,"category":9,"tags":10,"excerpt":12},"af9cc98f65eb","Claude Fable 5.1 made me a really nice animated pelican","https:\u002F\u002Fsimonwillison.net\u002F2026\u002FSep\u002F1\u002Fclaude-fable-5-1\u002F","simon-willison","2026-09-01T23:57:28.000Z","ai",[11],"anthropic","Today is Claude Fable (and Mythos) 5.1 day. Anthropic say that Fable 5.1 \"sets a new standard for coding, knowledge work, and long-running problem-solving tasks\". Their announcement spends a notable amount of time on scientific research, boasting of a 52.6% score on the brand new…",1789487599895]