Fable 5 being gone made me realize how hard it is to go back

A developer paying for both Claude Pro and ChatGPT Plus reports that a briefly available model called Fable 5 was the first Claude release to match or exceed GPT-5.5 on coding tasks, not just UI work, before being pulled. The post offers no benchmark data, model size, or official Anthropic confirmation that this model existed or was intentionally released.