Almost every "build an app with AI" attempt ends the same way: a nice-looking mockup that breaks the second you click anything real. This one prompt fixes that. It turns ChatGPT, Claude, or Gemini into a technical co-founder that builds a real, working product with you across 5
PROMPT ENGINEERING
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Testing complex APIs with goal mode and sub-agents
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Try 5.5 on xhigh, scope the prompt well, ask it to write tests first, run /goal mode till a) all tests are green and b) a sub-agent with a clean context window can test the API and it works perfectly Overkill for 99% of APIs but maybe yours is extremely complex?
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Use loop prompt with Claude to perfect impossible tasks
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I don’t usually get excited about Claude models at all. Look at my track record. When it comes back, try it on a task you feel is completely out of reach for modern AI. Use a /loop prompt that provides a way to verify the result, and tell it not to stop until it’s perfect.
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Claude AI interface struggles with line breaks, stanzas there
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The Claude AI interface struggles with line breaks. The stanzas are there.
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Switched model for website rebuild, saving 11x token costs
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Fuck Fable I have just swapped the model I am using for rebuilding the godofprompt website saving 11x on the token costs!
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Introducing GLM-5.2 for Understanding Research Articles
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Introducing GLM-5.2 for understanding research papers 🚀
— alphaXiv (@askalphaxiv) 16 juin 2026
Highlight any section of a paper to ask questions and “@” other papers for quick context, comparisons, and benchmark references pic.twitter.com/84LDzhLjhhHighlight any section of an article to ask questions and '@' other articles for quick context, comparisons, and benchmark references.
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Meetup: ask Codex for startups, finances, groceries, games
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went to a meetup and people asked what should I be doing that I’m not doing rn just ask things want to build a startup – ask codex
want to sort your finances – asl codex want to order groceries – yes ask codex
want to build a game – indeed you should ask codex want to get a -
Leak of the entire system prompt of Claude Fable 5
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🚨 ALGUIEN ACABA DE FILTRAR EL SYSTEM PROMPT COMPLETO DE CLAUDE FABLE 5.
— Nico (@nicos_ai) 16 juin 2026
Te explico qué es y cómo revivir Fable 5:
Anthropic lo lanzó el 9 de junio.
En menos de 24 horas el prompt ya estaba público en GitHub.
120.000 caracteres. 1.585 líneas. Más de 27.000 tokens.
Cada… https://t.co/haMz8haQLX pic.twitter.com/RuhkqFj7iU—
SOMEONE JUST LEAKED THE ENTIRE SYSTEM PROMPT OF CLAUDE FABLE 5. I'll explain what it is and how to revive Fable 5: Anthropic launched it on June 9. In less than 24 hours, the prompt was already public on GitHub. 120,000 characters. 1,585 lines. More than 27
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Leak of Claude Fable 5’s system prompt and resurrection method
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🚨 ALGUIEN ACABA DE FILTRAR EL SYSTEM PROMPT COMPLETO DE CLAUDE FABLE 5.
— Nico (@nicos_ai) 16 juin 2026
Te explico qué es y cómo revivir Fable 5:
Anthropic lo lanzó el 9 de junio.
En menos de 24 horas el prompt ya estaba público en GitHub.
120.000 caracteres. 1.585 líneas. Más de 27.000 tokens.
Cada… https://t.co/haMz8haQLX pic.twitter.com/RuhkqFj7iUSOMEONE JUST LEAKED THE ENTIRE SYSTEM PROMPT OF CLAUDE FABLE 5. I'll explain what it is and how to resurrect Fable 5: Anthropic launched it on June 9. Within 24 hours, the prompt was already public on GitHub. 120,000 characters. 1,585 lines. More than 27
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Frustration about missing tool prompts in published system prompts
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Looks like that's the search tool usage instructions – they still don't share tool prompts in their published system prompts which continues to be frustrating