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Summary: I came across Marc Andreessen's viral system prompt. The co-founder of Netscape, one of the sharpest minds in Silicon Valley, posted his custom ChatGPT instructions online and got absolutely roasted for it. Telling an AI it has "intellectual firepower on par with the smartest people in the world" doesn't make it smarter. Telling it to never hallucinate doesn't stop hallucinations. And asking for answers "as long and detailed as possible" just produces verbose nonsense that buries any actual value. His system prompt is stuck in 2023.

In this video I fix it. We go through exactly what's broken in Andreessen's custom instructions and why, then build a system prompt from scratch using the RISEN(TM) framework — a structured approach to writing AI instructions that actually holds up in 2026. You'll learn why role declarations don't make AI smarter (but are still useful), why adjectives are useless without verbs, how to write custom instructions that change AI behaviour rather than just describe it, and how to define an end goal that stops your AI padding everything out. Whether you're using ChatGPT custom instructions or Claude's system prompt settings, this will change how you prompt.

—— Time Stamps ——

0:00 Marc Andreessen's Viral System Prompt Is Getting Mocked Online
1:14 Why "World-Class Expert in All Domains" Doesn't Work
2:19 "Never Hallucinate" Is Not How AI Actually Works
2:58 Tone, Provocative Answers, and Why "Bloviate" Padding Backfires
3:54 The Anti-Sycophancy Trick That Actually Works
5:39 System Prompts vs Conversational Prompts Explained
6:13 How to Add Custom Instructions in ChatGPT and Claude
8:03 The Role Declaration Myth (Ethan Mollick Research)
10:41 Use Verbs, Not Adjectives, In Your Prompts
11:39 Why "Think Step By Step" Is Outdated in 2026
14:07 You Can't Prompt Your Way Out of AI Hallucinations
16:47 Why Asking for Long Detailed Answers Wastes Tokens
18:49 The RISEN Prompt Engineering Framework Explained
24:46 RISEN in Action: A Better Version of Marc's Prompt
26:13 The Coffee Order Analogy: When NOT to Engineer Prompts
28:18 Free Quick-Start Guide and Outro

— Useful Resources ——

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