Everyone in the industry can sense that the current AI large models competition has long entered the stage of engineering-level productivity battles. Recently, Anthropic's major release of Claude Fable 5 is now available, with API access fully open, allowing developers to get early hands-on experience with this top-tier model. It can be said that it has an essential difference from ordinary coding models. The actual test data is quite intuitive: in professional software engineering evaluation SWE-bench