Ari Seff

Robotics @OpenAI | Previously @Waymo, PhD @Princeton

[Ari Seff @ari_seff]

Can we model driving similarly to how we model language?

Excited to introduce MotionLM, where we represent driving scenarios as conversations among road users.

It establishes a new state-of-the-art in multi-agent motion forecasting: https://t.co/mHiODssCkU

[Ari Seff @ari_seff]

@PengchuanZ Looking forward to working together!

[OpenAI @OpenAI]

GPT-5.2 Thinking evals

[Ari Seff @ari_seff]

I’m at ICCV this week in Hawaii. Excited to talk with folks about robotics, agents, and multimodal reasoning. Reach out to chat!

[Sam Altman @sama]

watching chatgpt agent use a computer to do complex tasks has been a real "feel the agi" moment for me; something about seeing the computer think, plan, and execute hits different.

[Nathan Lambert @natolambert]

One of the most striking, non-text AI plots I've seen since ChatGPT launched. Scaling keeps working, this time for Waymo's tooling.

[Riley Goodside @goodside]

o3-pro: How many of each letter are there in the SHA1 of the answer to this question?

[Greg Brockman @gdb]

Operator is now powered by o3, improving overall task success rate. Also results in clearer, more thorough, and better-structured responses.

[Ari Seff @ari_seff]

we’ve trained our reasoning models to get better at using computers, and now operator is powered by o3. super fun effort with the team!

computer use remains a tough frontier problem, but this update represents a substantial increase in capability: https://t.co/iUE4UV5lm5

[OpenAI @OpenAI]

Operator 🤝 OpenAI o3

Operator in ChatGPT has been updated with our latest reasoning model.

https://t.co/gGhvuyz5HB

[Ari Seff @ari_seff]

@ptievgaleks @yuntiandeng If given the same time budget? I'm not so sure. Actually I'd be surprised if the accuracy were anywhere close.

In any event, lengthy multiplication is not really what these models are designed for, which is why we generally give them access to tools :)

[Ari Seff @ari_seff]

Language models are not designed specifically for lengthy arithmetic. That's why we generally give them access to tools (eg, the old computer you mention). In this case OP is testing the model on lengthy multiplications "by hand", which I think most humans would struggle with if given the same inference-time budget. As reasoning/inference-time compute increases, these mistakes reduce.

[Sam Altman @sama]

fun watching people react to operator. reminds me of the chatgpt launch!

[OpenAI @OpenAI]

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 American leadership in AI, create hundreds of thousands of American jobs, and generate massive economic benefit for the entire world. This project will not only support the re-industrialization of the United States but also provide a strategic capability to protect the national security of America and its allies.

The initial equity funders in Stargate are SoftBank, OpenAI, Oracle, and MGX. SoftBank and OpenAI are the lead partners for Stargate, with SoftBank having financial responsibility and OpenAI having operational responsibility. Masayoshi Son will be the chairman.

Arm, Microsoft, NVIDIA, Oracle, and OpenAI are the key initial technology partners. The buildout is currently underway, starting in Texas, and we are evaluating potential sites across the country for more campuses as we finalize definitive agreements.

As part of Stargate, Oracle, NVIDIA, and OpenAI will closely collaborate to build and operate this computing system. This builds on a deep collaboration between OpenAI and NVIDIA going back to 2016 and a newer partnership between OpenAI and Oracle.

This also builds on the existing OpenAI partnership with Microsoft. OpenAI will continue to increase its consumption of Azure as OpenAI continues its work with Microsoft with this additional compute to train leading models and deliver great products and services.

All of us look forward to continuing to build and develop AI—and in particular AGI—for the benefit of all of humanity. We believe that this new step is critical on the path, and will enable creative people to figure out how to use AI to elevate humanity.

[Sulin Liu @su_lin_liu]

Discrete generative models use denoisers for generation, but they can slip up. What if generation *isn’t only* about denoising?🤔

Introducing DDPD: Discrete Diffusion with Planned Denoising🤗🧵(1/11)

w/ @junonam_ @AndrewC_ML @HannesStaerk @xuyilun2 Tommi Jaakkola @RGBLabMIT

[Ari Seff @ari_seff]

@anbarbazan @pengzh97 @luyirenmax @cole_gulino @JustinFu769512 For sure, planning is also a natural use case of this type of agent simulation. For scope reasons, the paper focuses on agent realism and offboard eval as case studies

[Ari Seff @ari_seff]

Evaluating autonomous vehicles in simulation is only useful if the other agents exhibit realistic reactions.

We introduce a simple scheme for running RL on top of pre-trained behavior models to improve agent realism. (new paper with my former colleagues at @Waymo):

[Ari Seff @ari_seff]

@wilson1yan @matei_zaharia @VladMnih @pabbeel @AleksandraFaust @haoliuhl Very nice work!

Qq: since it’s always the rightmost latents that are masked, if one was using a CNN-based VQ-VAE (as opposed to ViT-based), I assume this would result in the reconstruction degradation being explicitly biased towards specific image regions - is that accurate?

[Ari Seff @ari_seff]

Very cool postdoc opportunity at Princeton.

Had the great pleasure of working with Ryan during my PhD. If you're an AI researcher considering a postdoc, highly recommend taking a look:

[Ryan Adams @ryan_p_adams]

We are looking for AI Postdoctoral Fellows! Be a part of AI for Accelerating Invention, a new research initiative out of the Princeton AI Lab. You can learn about AI for Accelerating Invention here: https://t.co/BYUplNNyKq and apply for the postdoc here: https://t.co/iDM0IzE1hM.

[Ari Seff @ari_seff]

@littmath Oh nw!