Claude Fable 5.1 is here — this one prompt shows what it can really do
Claude Fable 5.1 is here with stronger reasoning and agentic capabilities — here’s what’s new and why Anthropic’s latest AI model matters.
Claude Fable 5.1, Anthropic's latest high-end model, has arrived. Designed for complex tasks requiring sustained reasoning, it focuses on agentic work such as planning, using tools, checking progress, and working through problems with less supervision. With a 1-million-token context window, it excels at handling large codebases, lengthy documents, and research-heavy projects. Fable 5.1 can be given a project rather than just a prompt.
For those new to Claude, here's a suggested prompt: "I'm building [describe a real project you're actually working on, in detail]. Here's my current approach: [paste your code, outline, or plan]. Tell me what's wrong with my thinking, what I'm missing, and then refactor or redesign the whole thing — but explain your reasoning at each decision point so I can learn from it."
This prompt allows Claude to understand the project and approach, identify weaknesses, decide which problems matter, and redesign the work while keeping track of decisions. The prompt is effective for various projects, including code, business plans, novels, research projects, presentations, and home renovation plans.
Written by urgent.news from Tom's Guide's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
