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The a16z Show

GPT-5 and Agents Breakdown – w/ OpenAI Researchers Isa Fulford & Christina Kim

The a16z Show

a16z

Science, Innovation, Business, Entrepreneurship, Culture, Disruption, Software Eating The World, Technology

4.41.1K Ratings

🗓️ 8 August 2025

⏱️ 44 minutes

🧾️ Download transcript

Summary

ChatGPT-5 just launched, marking a major milestone for OpenAI and the entire AI ecosystem. Fresh off the live stream, Erik Torenberg was joined in the studio by three people who played key roles in making this model a reality: - Christina Kim, Researcher at OpenAI, who leads the core models team on post-training - Isa Fulford, Researcher at OpenAI, who leads deep research and the ChatGPT agent team on post-training - Sarah Wang, General Partner at a16z, who’s led our investment in OpenAI since 2021 They discuss what’s actually new in ChatGPT-5—from major leaps in reasoning, coding, and creative writing to meaningful improvements in trustworthiness, behavior, and post-training techniques.

Transcript

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0:00.0

I mean, I think it's pretty unique at Open AI to be able to work on something that's so generally useful. I mean, it's like everything they tell you not to do at a startup is just like your user as anyone. You just kind of take it for granted that you literally have this like wizard in your pocket. We're trying to make the most capable thing and we're also trying to make it useful to as many people as possible and accessible to as many people as possible. I think we hear this with GPT5 internally when people are testing and they're like,

0:24.7

oh, I thought I asked like a really hard question. I feel like a little bit insulted that it's

0:28.2

after like two seconds or like when it doesn't even want to think at all.

0:32.6

Today's episode was recorded the day GPT5 launched, a major milestone not just for Open AI, but for the entire

0:38.6

AI ecosystem. Joining me in the studio, fresh off the launch live stream, where three people

0:43.5

were instrumental in making this model a reality. Christina Kim, researcher at OpenAI, who leads

0:49.0

the core models team on post-training, Isa Fulford, researcher at OpenAI, who leads deep research and the

0:54.9

chat GPT agent team on post-training, and A16Z general partner, Sarah Wang, who's helped lead

1:00.3

our investment in Open AI since 2021.

1:03.1

We talk about what's new in GPT-5, from major leaps in coding and creator writing to meaningful

1:07.8

improvements in reasoning, behavior, and trust. We also get into training,

1:11.9

RL environments, and why data quality is more important than ever. We also cover agents,

1:16.8

what that word actually means, the paradigm shift for async workflows, and the golden age for

1:21.3

the idea guys. Let's get into it. As a reminder, the content here is for informational purposes only. Should not be taken as legal

1:30.8

business, tax, or investment advice, or be used to evaluate any investment or security, and is

1:35.8

not directed at any investors or potential investors in any A16Z fund. Please note that A16Z and

1:41.6

its affiliates may also maintain investments in the companies discussed in this podcast.

1:45.6

For more details, including a link to our investments, please see A16Z.com forward slash disclosures.

1:56.6

So slow news day. Not much going on for you guys. Thank you for, thank you for coming out. No, obviously, you know, Tina, you were just on the live stream. We're recording a day of. Congratulations. Thank you. For those who are unfamiliar, why don't you introduce what you guys do at open air? Yeah. I'm Christina. I lead the core models team on post training. I'm Issa. I lead the deep research, like chat GPT agent team on post training.

2:21.3

And Tina, you've been here for, or you've both been here for a while now.

2:24.3

Tina, what you want you to be a little bit of your history at the company?

2:27.3

Yeah, I've been on opening eye for about four years now.

...

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