The reporting follows leaks of a 'Fable 5.5' model in Microsoft Azure and LiteLLM's GitHub data. Traces of a model named 'claude-onigiri-eap-2' also appeared in Artificial Analysis's code, featuring four distinct reasoning levels from low to 'xhigh.' While Anthropic has not officially announced a date, several sources indicate corporate partners have already tested two separate checkpoints of the Fable 5.5 model.
