Post #4450 667 Sep 2, 2026, 08:24 UTC Anthropic released a new prompt that eliminates claudese Claude Platform Docs Prompting Claude Fable 5.1 Behavioral differences and prompting patterns for Claude Fable 5.1 and Claude Mythos 5.1, covering effort, progress updates, tool-call batching, conversation history, writing style, formatting, task completion, compaction summaries, scope and test coverage… 🔥 5