John Carmack

John Carmack

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AGI at Keen Technologies, former CTO Oculus VR, Founder Id Software and Armadillo Aerospace

Game Startups Demand Clear Customers, Tiny MVP, and Luck
SocialMay 12, 2026

Game Startups Demand Clear Customers, Tiny MVP, and Luck

My reply to someone considering starting a video game company: The distribution of possible rewards for starting a video game company are generally not very good today. The market is well served, and gaining a foothold requires strong execution on both...

By John Carmack
First to Play New Beat Saber Pack, Hits Top‑10
SocialApr 29, 2026

First to Play New Beat Saber Pack, Hits Top‑10

New @BeatSaber music pack is out, and I must be one of the first to play, landing a top-10 score that will surely be out of the top 100 by tomorrow. https://t.co/NAy8dp4C66

By John Carmack
Tiny Matrix Size Jump Causes 10× GPU Slowdown
SocialApr 29, 2026

Tiny Matrix Size Jump Causes 10× GPU Slowdown

GPU library performance can be very notchy -- runtime of batched torch.linalg.solve_ex() went up by over 10x going from 511x511 matrices to 512x512.

By John Carmack
Instant Feedback Crucial for Circular Elevator Pods
SocialApr 27, 2026

Instant Feedback Crucial for Circular Elevator Pods

I was on a cruise ship last week (Star of the Seas), and they had pods of 10 elevators in a circle, where you picked your destination floor on a pad, and it directed you to the correct elevator, which...

By John Carmack
Pairwise ELO Rankings Streamline Awards and Performance Reviews
SocialApr 6, 2026

Pairwise ELO Rankings Streamline Awards and Performance Reviews

So many judging tasks could be improved by aggregating partial orderings, and in the limit, just ordering pairs. The annual Libertarian Futurist Society novel awards discussion is starting, and while I would like to participate on some level, there is no...

By John Carmack
GPU Power Draw Beats Scheduling as Utilization Metric
SocialApr 2, 2026

GPU Power Draw Beats Scheduling as Utilization Metric

Without getting all the way down to performance counters, GPU power from nvidia-smi is a better indicator of true utilization than job scheduling or “gpu busy”. I would love to see animated “heat maps” of the big data centers, with...

By John Carmack
SigReg Loss Boosts Stable Pixel‑based World Models
SocialMar 31, 2026

SigReg Loss Boosts Stable Pixel‑based World Models

Paper review: LeWorldModel: Stable End-to-End Joint-Embedding Predictive Architecture from Pixels https://t.co/TpFFnwPWkc Nice clean github: https://t.co/HOuqEf0HaF This is the application of the LeJEPA results to world models, trained offline on experience from three different robotics style tests with one to two million steps in...

By John Carmack
Use Advisors as a Skill‑Based Pool, Not Vibe Checks
SocialMar 17, 2026

Use Advisors as a Skill‑Based Pool, Not Vibe Checks

The corporate advisory boards that I have been a part of have almost exclusively been “vibe checks”, where presentations are made about work the company is doing, and the advisory panel chats about things for a while. This seems like a...

By John Carmack
Epic's $0‑to‑$1M Tax Boosts Dev Activity, Avoids Waste
SocialMar 11, 2026

Epic's $0‑to‑$1M Tax Boosts Dev Activity, Avoids Waste

Companies like Meta subsidize third party developers in various ways to help grow their platforms, then take 30% of the developer revenue right back with the platform tax, which is a wasteful churn. Epic’s tax structure of zero for the first...

By John Carmack
Ethics Chapter Misses Depth, Confuses Relevance with Legitimacy
SocialMar 9, 2026

Ethics Chapter Misses Depth, Confuses Relevance with Legitimacy

I still give the book Understanding Deep Learning by Simon J.D. Prince a good recommendation, but chapter 21: Deep learning and Ethics was sloppy. It could have been a chapter to really dig in on case studies, but it was...

By John Carmack
Low IQ, High Agency: AI Trust Wins
SocialFeb 12, 2026

Low IQ, High Agency: AI Trust Wins

The modern age has richly rewarded people with a combination of high intelligence and high agency. Now that many aspects of intelligence are successfully being automated, it seems likely that people with relatively lower intelligence but exceptional agency will come...

By John Carmack
Baseline Agent Outperforms Standard Algorithms in Physical Atari Replication
SocialJan 6, 2026

Baseline Agent Outperforms Standard Algorithms in Physical Atari Replication

Another RL team replicated our Physical Atari work and compared my baseline agent against several standard algorithms. https://t.co/uyWjFXxnZO

By John Carmack
PyTorch's 64‑bit Index Standard Simplifies Development
SocialJan 2, 2026

PyTorch's 64‑bit Index Standard Simplifies Development

Pytorch made the right call standardizing on signed 64 bit indexes. I would probably still be rather pointlessly making case by case decisions to use int32 if it were an option. Some old habits linger.

By John Carmack
Will Journals Reject Papers Using Real Code Variable Names?
SocialDec 23, 2025

Will Journals Reject Papers Using Real Code Variable Names?

Would papers get rejected if they used legal code with variable names instead of Greek laden pseudo code?

By John Carmack
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