Claude Fable 5 Achieves Largest Posttraining Gains On FrogsGame Benchmark

models are becoming better at posttraining. Fable 5 specifically solves many of the shortcomings we discussed in our previous report. more mature decision making, questioning the default approaches and better calibration. it feels like a model that "gets it" as @karpathy mentioned. There is still room for improvement specifically understanding the big picture and better calibration but frogsgame is not a good benchmark for that. we need better real world post-training tasks. read more about what we found here.