John Hallman (@johnohallman) / X

John Hallman

230 posts

John Hallman

@johnohallman

Post-training @OpenAI, previously pre-training/bio

Joined June 2017

Pinned
John Hallman
@johnohallman
Aug 22, 2025
We trained a new bio AI model and used it to design new Yamanaka factor variants for iPSC generation, achieving over 50x higher efficiency! 🧬
Boris Power
@BorisMPower
Aug 22, 2025
At @OpenAI, we believe that AI can accelerate science and drug discovery. An exciting example is our work with @RetroBiosciences, where a custom model designed improved variants of the Nobel-prize winning Yamanaka proteins. Today we published a closer look at the breakthrough. ⬇️
49K
John Hallman
@johnohallman
Dec 20, 2024
When Sam and us researchers say AGI is coming we aren't doing it to sell you cool aid, a $2000 subscription, or to trick you to invest in our next round. It's actually coming.
Noam Brown
@polynoamial
Sep 12, 2024
Today, I’m excited to share with you all the fruit of our effort at @OpenAI to create AI models capable of truly general reasoning: OpenAI's new o1 model series! (aka 🍓) Let me explain 🧵 1/
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John Hallman
@johnohallman
Apr 16, 2025
When o3 finished training and we got to try it out, I felt for the first time tempted to call a model AGI. Still not perfect, but this model will beat me, you, and 99% of humans on 99% of intelligence assessments. One can start to see the light at the end of the tunnel
OpenAI
@OpenAI
Apr 16, 2025
Introducing OpenAI o3 and o4-mini—our smartest and most capable models to date. For the first time, our reasoning models can agentically use and combine every tool within ChatGPT, including web search, Python, image analysis, file interpretation, and image generation.
00:00
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John Hallman
@johnohallman
Aug 5, 2025
Excited to share gpt-oss with the world! We are releasing two open-weights models – one 5.1B active 117B total params and one 3.6B active 20.9B total params. They are very good for their size. In particular, running 20B locally is a truly magical experience. Enjoy 🫡
OpenAI
@OpenAI
Aug 5, 2025
Our open models are here. Both of them. openai.com/open-models
46K
John Hallman
@johnohallman
Apr 14, 2025
It's been an absolute privilege to get to work with @michpokrass on the 4.1 model series, and especially on nano which i co-led (shoutout @SuvanshSanjeev on post training!) 4.1 nano is a ridiculously small model, which made training this model challenging in ways many of our
OpenAI Developers
@OpenAIDevs
Apr 14, 2025
Announcing GPT-4.1, GPT-4.1 mini, and GPT-4.1 nano in the API. TL;DR: Major improvements on coding, instruction following, and long context. 💥 00:00 Intro 02:18 Coding 04:53 Instruction following 06:58 Long context 10:22 Demos, pricing, and availability 20:00 @windsurf_ai
00:00
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John Hallman
@johnohallman
Dec 25, 2024
Indians and Chinese in America have reached Jew status – so successful and talented that everyone hates on them! I can only hope Sweden reaches this level one day...
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John Hallman
@johnohallman
Dec 22, 2024
Do: - Learn how to use AI - Raise the ceiling for what you believe you can achieve with future technology Don't: - Put your head in the sand - Burn all your savings on booze and drugs (at least not until UBI is passed)
4.1K
John Hallman
@johnohallman
Jul 12, 2025
If only people knew how hard it’s been for the industry to move past tokenization
Albert Gu
@_albertgu
Jul 11, 2025
Tokenization is just a special case of "chunking" - building low-level data into high-level abstractions - which is in turn fundamental to intelligence. Our new architecture, which enables hierarchical *dynamic chunking*, is not only tokenizer-free, but simply scales better.
6.8K
John Hallman
@johnohallman
Feb 3, 2025
Deep Research feels like the kind of product that by itself could be a huge company. And Neel is the type of PM who could be the CEO of that company 🫡
Neel Ajjarapu
@neelajj
Feb 3, 2025
So excited to be sharing what I’ve been working on since joining OpenAI Deep Research is incredibly powerful, and marks the just beginning of models intelligently interacting with the outside world Congrats to @isafulf @EdwardSun0909 and the whole team who made this possible
5.3K
John Hallman
@johnohallman
Jul 19, 2025
Absolutely incredible work by @alexwei_ @SherylHsu02 @polynoamial and co! When o3 came out I would cope that I was still smarter since its IMO score was lower than mine Only lasted 3 months lol
Alexander Wei
@alexwei_
Jul 19, 2025
1/N I’m excited to share that our latest @OpenAI experimental reasoning LLM has achieved a longstanding grand challenge in AI: gold medal-level performance on the world’s most prestigious math competition—the International Math Olympiad (IMO).
4.8K
John Hallman
@johnohallman
Apr 25, 2025
Pls help us save Kai 🥺😢
Noam Brown
@polynoamial
Apr 25, 2025
It's deeply concerning that one of the best AI researchers I've worked with, @kaicathyc, was denied a U.S. green card today. A Canadian who's lived and contributed here for 12 years now has to leave. We’re risking America’s AI leadership when we turn away talent like this.
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John Hallman
@johnohallman
Apr 16, 2025
I cannot believe that this is man who first edited human embryos, truly the wildest timeline 😭
Jiankui He
@Jiankui_He
Apr 16, 2025
Good morning bitches. How many embryos have you gene edited today?
4.2K
John Hallman
@johnohallman
Nov 1, 2024
Tenet is a good movie
Dylan O'Sullivan
@DylanoA4
Oct 31, 2024
About to watch Tenet for the first time and I enjoyed it
2.7K
John Hallman
@johnohallman
Jan 22, 2025
GPUs go brrr
OpenAI
@OpenAI
Jan 21, 2025
Announcing The Stargate Project The Stargate Project is a new company which intends to invest $500 billion over the next four years building new AI infrastructure for OpenAI in the United States. We will begin deploying $100 billion immediately. This infrastructure will secure
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