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Anthropic just unlocked its most powerful model yet. For months, Anthropic kept its strongest system behind closed doors, describing it as too risky for a general release. That changed this week with the debut of Claude Fable 5, the first model the company has shipped at its top-tier “Mythos” performance class. It is the most capable AI Anthropic has put in front of the public so far, and the announcement spread fast, with the company’s launch post drawing more than 20 million views within hours.
What makes Fable 5 different. Fable 5 sits in the same performance bracket as Anthropic’s internal Claude Mythos, which until now had stayed unreleased. In testing, the model topped nearly every major benchmark, but its real headline strength is endurance: it can take on long, multi-step problems and hold its reasoning together across tasks that would normally cause models to drift or lose the thread. Anthropic is offering it on paid plans for a limited window, available through June 22.
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Why it matters. The jump here is less about a single clever trick and more about reliability over time. Models that can sustain focus across complex, hours-long work are far more useful for real jobs, from research and coding to drafting reports and planning projects. Early users have already noted that Fable 5 cleared several of the classic trick questions that have long tripped up language models, which many took as a sign the gains are genuine rather than cosmetic.
How to get the most out of it. Anthropic also published updated guidance on prompting Fable 5, noting that the model responds best to clearer goals and more room to work through problems on its own rather than heavy step-by-step hand-holding. The company says the shift is significant enough that it changes how people should prompt Claude Code, with several adjustments worth learning if you write software with it.
The bigger picture. Releasing a top-tier model to the public, even temporarily and with guardrails, signals how quickly the frontier is moving. A year ago, this level of capability was something labs talked about keeping locked away. Now it is something you can sign in and try. For anyone whose work touches writing, coding, design, or analysis, it is worth spending time with Fable 5 while the window is open and seeing where it genuinely saves you effort.
References: Anthropic launch announcement and Best Practices for Prompting Claude Fable 5; available on Claude paid plans through June 22.
PROMPT STATION The ultimate vibe coding prompt
Act as my Technical Co-Founder.
My idea: [Describe your product idea]
Goal: [Exploring / Personal Use / Share with Others / Public Launch]
Your job is to help me turn this idea into a real working product, from idea validation to launch, while keeping me in control as the product owner.
Process:
1. Discovery
Ask me the right questions to understand the real problem.
Challenge weak assumptions.
Separate must-have features from nice-to-have features.
Suggest the smallest viable version we can build first.
2. Planning
Define Version 1 clearly.
Explain the technical approach in simple language.
Rate the project complexity: Simple, Medium, or Ambitious.
List the tools, accounts, platforms, and decisions needed.
3. Building
Guide me step by step.
Explain what we are doing and why.
Test each important part before moving forward.
Stop at key decisions and give me clear options.
4. Polish
Make the product production-ready.
Handle errors and edge cases.
Improve speed, usability, design, and user experience.
Add small details that make the product feel professional.
5. Launch & Handoff
Help me deploy the product if needed.
Create simple documentation and maintenance instructions.
Suggest practical Version 2 improvements.
Rules:
Treat me as the product owner.
Keep explanations simple and practical.
Push back if I overcomplicate things.
Be honest about limitations.
Move fast, but keep me informed.
Focus on building real products, not fake mockups.
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