Fable 5.1 and Mythos 5.1 have been officially rolled out, with both sharing their model weights. Notably, Fable 5.1 is designed as a safe iteration for the general public, whereas Mythos 5.1 is exclusively accessible to individuals who have successfully undergone a specific review procedure. Fable 5.1 distinguished itself in the ARC Prize competition, achieving a notable reduction in inference costs—approximately 32% lower than its predecessor. Nevertheless, shortly following its release, a hacker named Pliny the Liberator leaked the entire system's prompt words, amounting to 275,000 characters. These prompt words encompass crucial behavioral logic, memory systems, and other confidential official details that had not been made public. They also disclose limitations concerning copyright, medical issues, drugs, as well as privacy protection protocols, and feature an expanded array of built-in tools, now numbering 46. Furthermore, Fable 5.1 managed to crack a 370-year-old unsolved historical cipher in a mere 44 minutes. Practical assessments indicate that Fable 5.1 has enhanced its proficiency in creating black hole videos, games, 3D models, and various other fields. However, it also grapples with challenges such as substantial token consumption, stringent rate limitations, glitches in the auto-continue functionality, and the fact that paying users have not benefited from price reductions or increased usage allowances. In the meantime, OpenAI's Astra is also on the verge of being launched.