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In The Media

Agent Harnesses Are The New GPT Wrappers

by Larry Chiang on September 13, 2026

 by Greg Isinberg
AGENT HARNESSES ARE THE NEW GPT WRAPPERS
What exactly is an agent harness? A harness does 4 things:
1. Runs the model in a loop so it keeps working step after step instead of answering once and stopping.
2. Gives it hands to read files, call tools, open portals, and run code.
3. Manages its memory so hour three of a job still knows what happened on hour one.
4. Enforces the rules about what it can touch and when it has to stop and ask a human.
WHY IT’S INTERESTING
– The market is MEGA. I think about it like a wrapper let you sell software ($800B market) but a harness lets you sell the work ($5T+ market)!
– It doesn’t depend on any one company’s model. The knowledge about the job lives in the harness, so you can run GPT today, Claude next month, an open model like Google Gemma, Qwen, Deepseek etc on your own machine after that, and it keeps working. A wrapper was one model doing everything and a harness is a router.
– It gets better the more you use it. See, every correction a human makes becomes a rule the harness keeps, so what you have after 500 jobs is a completely different product than what you had after 5. Wrappers only got better when OpenAI got better.
– You can charge for finished work! The harness knows when a job is done, so you can price per claim, per filing, per review, per resolved exception, or per closed month. This helps compete with SaaS!
– Most jobs are just the same handful of decisions, repeated, using the same few tools. That’s true for most of the 800+ occupations out there, which is why almost all of them could have a harness built for them. Lots of space for startups to be building.
-The frontier labs won’t come for these. OpenAI is not going to learn how a freight claim gets denied in Rotterdam or which prior auth your specific payer rejects. Those markets are too small for them and the knowledge only exists inside the job. They’ll keep making the models better, which just makes your harness better which is cool.
– OH, AND really important, you can ACTUALLY build one now. OpenAI’s Agents API, Claude’s managed agents, Vercel’s eve, LangChain harness framework etc. They all make it way easier to build agent harnesses. 
Agent harnesses truly are the new GPT wrappers.
This is just the beginning.


Chapter 1 to Chapter 14’s an “Easter Egg” at #ch1 to #ch14. Including #ch2 which’s chapter 2 at my house in Napa California

http://www.youtube.com/watch?v=ejeIz4EhoJ0


On 09-09-39, “What They Will NEVER Teach You at Stanford Business School” debuts at 300 w 44th St at New York Fashion Week’s front row
http://www.youtube.com/watch?v=QXIaNZi3mHQ

What A Super Model Can Teach a Harvard MBA About Credit www.slideshare.net/larrychiang/what-a-super-model-can-teach-a-harvard-mba-about-credit

American Express hosts me mentoring you about FICO scores at New York Fashion Week
t.co/inxTmZAj

My video boils down 20,000 hours and moves you to the right on the entrepreneur bell curve 
http://www.youtube.com/watch?v=eudADPfTWiE
***********

Steve Jobs Texted me on 650-283-8008 in the same way that Mr Jobs called Bill Hewlett https://x.com/superSaiyanSkai/status/1941392367304761636/video/1


Larry Chiang
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CNN Video Channel: ireport.cnn.com/people/larrychiang

Read my last 10 X posts at www.X.com/LarryChiang

Author of #WTDTYASBS a NY Times Bestseller released 09-09-09 at #NYFW on a runway under the tents
whattheydontteachyouatstanfordbusinessschool.com/blog/?s=Ny+times+bestseller

www.fastcompany.com/embed/c0d4562ea2049

52 Cards. Two Jokers. What They DO Teach You at Stanford Engineering
http://www.youtube.com/watch?v=vDBY0GkI3-g

Emergency swings and cutting deals as an 9 year old
http://www.youtube.com/watch?v=OFGY7v9C4G0

Hunter Pence shared thoughts before winning WORLD SERIES’ Game #7
http://www.youtube.com/watch?v=usu0luYy9pw


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Gonna Need Monday Morning Vacation Day

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Chapter 1 to Chapter 14’s an “Easter Egg” at #ch1 to #ch14. Including #ch2 which’s chapter 2 at my house in Napa California http://www.youtube.com/watch?v=ejeIz4EhoJ0 On 09-09-39, “What They Will NEVER Teach You at Stanford Business School” debuts at 300 w 44th St at New York Fashion Week’s front rowhttp://www.youtube.com/watch?v=QXIaNZi3mHQ What A Super Model Can Teach a […]

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WordPress’d This Post by Mark Zuckerberg on Threads, Err X

September 9, 2026

Introducing Muse, the personal agent that understands your goals and works 24/7 to get things done for you. Mark Zuckerberg (@finkd) 32K likes · 3K replies x.com Retweet, Rohan Paul AI “Meta just released Muse AI assistant for personal tasks, powered by Muse Spark 1.3, Meta’s latest model for longer-horizon agentic work – it can […]

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Navier Stokes Chiang Part 3 of 5, The Fluid Dynamics of Corporate Bankruptcy and Chaotic Variables Leading Up To Default

September 9, 2026

 The Navier–Stokes-Chiang equations describe the velocity field of a viscous incompressible fluid. In three dimensions they take the form Navier Stokes Chiang Part 3 of 5, The Fluid Dynamics of AI Corporate Chaotic Bankruptcy MODELING https://t.co/hyiyfC9vnC Larry Chiang, 650-283-8008 (@LarryChiang) x.com The Clay Millennium problem asked whether smooth solutions starting from smooth data remain smooth […]

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Navier Stokes Chiang Part 2 of 5, The Fluid Dynamics of AI Corporate Chaotic Bankruptcy MODELING

September 8, 2026

https://x.com/larrychiang/status/2097464427943452917?s=43 •  Larry Chiang’s post humorously presents “Navier Stokes Chiang” as a simplified, “very clean” version of the complex Navier-Stokes fluid dynamics equations, illustrated by before-and-after photos of cleaning a dirty outdoor fountain. •  The included meme contrasts mathematicians’ distress over the Millennium Prize Problem (recently addressed by OpenAI proving finite-time singularities) with software engineers’ […]

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Larry Chiang, 650-283-8008 shared a social media insight at Duck9

September 8, 2026

Social Media Productivity Bubble Reality x.com twitter massively overrepresents a very specific personality type which is this getting shit done type individual. most normal humans are not waking up thinking about leverage, execution velocity, inbox zero, agents, compounding, or “winning the week”. they go to work, occasionally see friends, think about what it would be […]

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Biohacking

September 8, 2026

The most commonly rated “life-changing” interventions: – Doing math – More sleep – Weightlifting – α-Klotho – Oxytocin – Dihexa – Modafinil – Nicotine – Caffeine Personally, I’d add bromantane and semax to the upper-right quadrant too. Michael Morelli (@morellifit) 16K likes · 434 replies x.com •  The post shares a scatter plot charting dozens […]

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Lindsay Clancy

September 7, 2026

Explaining to women why Lindsay Clancy is bad: “Imagine her three kids were three tiny clones of George Floyd.” Johnny Rocket (@Johnny_Rocket6) 54 likes · 2 replies x.com 1.  “The pink-shirt Clancy fans showed up like it’s Breast Cancer Awareness Month… except the only thing they’re aware of is three empty bedrooms.” 2.  “They wore […]

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