Anthropic's next-generation flagship model, Claude Fable 5.5—which has yet to be officially released—has recently drawn attention in overseas developer communities. Several developers shared on social platform X what they claimed were early test results from the model, with a 66-second animated short film generated entirely through programming particularly standing out. The tester said the model did not call any image or video generation tools; instead, it continuously and autonomously wrote and ran code for approximately 2 hours and 40 minutes to complete the animation's visuals, soundtrack, and sound effects.