Why AI Companies Lied About Context Windows

Tiago Forte October 28, 2025
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Tiago Forte

@tiagoforte

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Building a Second Brain is the proven method to organize your digital life and unlock your creative potential. We're on a mission to help you increase your productivity, and ​​lead a more fulfilling life with more ease and less stress. 🧠 HOW YOU CAN BUILD YOUR SECOND BRAIN Order the book: https://www.buildingasecondbrain.com/book Take the course: https://www.buildingasecondbrain.com/foundation 🤓 TEST YOUR PRODUCTIVITY POTENTIAL If you had a Second Brain, how much more organized, effective, calm, and creative could you be?  Take our quiz & find out: https://fortelabs.com/productivity-potential 📬 JOIN THE FORTE LABS NEWSLETTER Level up your productivity and life with new essays, videos, event invites, and other resources every Tuesday. Join 100k subscribers exploring the frontier of modern work, experimenting with new ways of doing more with less, and discovering what it means to fulfill our human potential. Subscribe here: https://fortelabs.com/subscribe

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📊 Get the complete LLM context performance guide: https://bit.ly/4nXImf4 🚀 Join the next cohort of Second Brain Enterprise: https://bit.ly/43ppkpE Most people assume adding more context to AI means better answers. But after working with 100+ companies, I discovered something counterintuitive: there's a hidden performance ceiling. All major LLMs—Claude, ChatGPT, Gemini—hit measurable accuracy drops after around 100,000 tokens. In this video, I cover: - What context rot is and why it's affecting your AI work - The research showing AI's real performance limits (spoiler: it's half of what companies advertise) - 3 practical techniques to structure information so AI actually focuses - How to use the PARA Method to organize documents for AI reliability 🧠 EXPLORE FURTHER: - Join Building a Second Brain App: https://buildingasecondbrain.com/app - Deep dive: Five Levels of Context: https://youtu.be/ipIOC55AwyQ - The PARA Method series: https://www.youtube.com/playlist?list=PLVNXAaej57W6qCYoMb_hbzDhX9et_GVlj - Research behind the video: https://research.trychroma.com/context-rot CHAPTERS: 00:00 - 00:17 The Problem Nobody Talks About 00:17 - 00:41 Why AI Misses Critical Details 00:41 - 01:40 The Real Research Behind Context Limits 01:40 - 02:08 Tiago's LLM Context Performance Guide 02:08 - 02:59 How AI Actually Processes Information 02:59 - 03:36 The Counterintuitive Truth About Context 03:36 - 04:15 The 1st Solution 04:15 - 04:58 The 2nd Solution 04:58 - 05:24 The 3d Solution 05:24 - 09:17 How Forte Labs Organizes Everything 09:17 - 09:44 Next Step Forward #ContextRot #AIProductivity #llm ----------------------- 💌 Join our weekly newsletter for more tips and resources: https://fortelabs.com/subscribe/ 📚ORDER MY BEST-SELLING BOOKS 🧠 Building a Second Brain: A Proven Method to Organize Your Digital Life and Unlock Your Creative Potential: https://www.buildingasecondbrain.com/book 📂The PARA Method: Simplify, Organize, and Master Your Digital Life: https://www.buildingasecondbrain.com/para 👩‍🎓 TAKE MY SELF-PACED COURSES 1️⃣ Pillars of Productivity: https://www.buildingasecondbrain.com/pop 2️⃣ BASB Foundation: https://www.buildingasecondbrain.com/foundation 🤓 TEST YOUR PRODUCTIVITY POTENTIAL Take our Productivity Pulse Check to evaluate your daily habits and find out where you can make improvements. Take the quiz now: https://fortelabs.typeform.com/pulsecheck?utm_source=youtube 👋 CONNECT WITH ME 📬 My weekly newsletter: https://fortelabs.com/subscribe 👩‍💻 LinkedIn: https://www.linkedin.com/in/tiagoforte/ 🌐 My website: https://www.buildingasecondbrain.com/ 💌 My blog: https://fortelabs.com/blog/ 🐦‍⬛ X: http://x.com/fortelabs 🟦 Facebook: https://www.facebook.com/fortelabs 🤳Instagram: https://www.instagram.com/fortelabsco/

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