Anthropic dev breaks down Fable AI
In a new 15-minute session, a core developer from Anthropic breaks down Fable, their most powerful AI model yet. The developer states, "Fable is one of those models you’ll always remember. Like Sonnet 3.5 or Opus 4.5. We just cut 80% of Claude Code’s system prompt." According to the developer, this new class of models thrives on a smaller prompt. The full video can be found at and the original tweet is at
