Claude 4-Model Accessibility Test: Fable 5.1, Opus, Sonnet 5
On September 1st, the Claude Code v2.1.257 release notes carried one short line: the default model for the Fable line had switched to 5.1. If you use Fable and have never touched the model setting, the brain writing your code got quietly swapped out that day. The same release notes had an exception, too — the fable alias in Claude app gateway sessions stays on Fable 5 for now. Read this as a story about the regular Claude Code you run from the terminal. ...