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

ℹ️ EPISODE INFO

Released

August 8, 2025

Duration

42m

Channel

a16z

Watch on YouTube

▶ Open ↗

📝 EPISODE DESCRIPTION

ChatGPT-5 just launched, marking a major milestone for OpenAI and the entire AI ecosystem. Fresh off today's live stream, a16'z 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 helped lead 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. We also discuss:

• How GPT-5 was trained, including RL environments, and why data quality matters more than ever
• The shift toward agentic workflows—what “agents” really are, why async matters, and how it’s empowering a new golden age of the “ideas guy”
• What GPT-5 means for builders, startups, and the broader AI ecosystem going forward

Whether you're an AI researcher, founder, or curious user, this is the deep-dive conversation you won't want to miss. Timecodes: 00:00 ChatGPT Origins 02:13 Model Capabilities & Coding Improvements 04:11 Model Behaviors & Sycophancy 06:15 Usage, Pricing & Startup Opportunities 08:03 Broader Impact & AGI Discourse 16:59 Creative Writing & Model Progress 31:50 Training, Data & Reflections 36:25 Company Growth & Culture 41:39 Closing Thoughts Resources: Find Christina on X: https://x.com/christinahkim Find Isa on X: https://x.com/isafulf Find Sarah on X: https://x.com/sarahdingwang Stay Updated: Let us know what you think: https://ratethispodcast.com/a16z Find a16z on Twitter: https://twitter.com/a16z Find a16z on LinkedIn: https://www.linkedin.com/company/a16z Subscribe on your favorite podcast app: https://a16z.simplecast.com/ Follow our host: https://x.com/eriktorenberg Please note that the content here is for informational purposes only; should NOT be taken as legal, business, tax, or investment advice or be used to evaluate any investment or security; and is not directed at any investors or potential investors in any a16z fund. a16z and its affiliates may maintain investments in the companies discussed. For more details, please see a16z.com/disclosures.

🎤 SPEAKERS

• Christina Kim

  guest

  OpenAI researcher who leads the core models post-training team.

• Erik Torenberg

  host

  Host at a16z who moderates and interviews guests on tech and AI.

• Isa Fulford

  guest

  OpenAI researcher leading Deep Research/agent post-training work; previously worked on ChatGPT retrieval and browsing.

🧾 EPISODE SUMMARY

In this episode of a16z, featuring Christina Kim and Erik Torenberg, GPT-5 and Agents Breakdown – w/ OpenAI Researchers Isa Fulford & Christina Kim explores openAI researchers unpack GPT-5’s usability, agents, data, and culture GPT-5 is positioned as a step-change in everyday utility—especially for coding and writing—beyond simply posting stronger benchmark scores.

🔗 RELATED EPISODES

The Golden Age Thesis | Marc Andreessen on MTS

The Investor Behind Costco, Starbucks, and Blackstone | Tony James on The a16z Show

Digital Freedom, AI Regulation, and the Fight for the Western Internet | The a16z Show

Crypto Experts Explain Stablecoins & the Future Financial System w/ Ali Yahya & Arianna Simpson

Why Scale Will Not Solve AGI | Vishal Misra - The a16z Show

Emil Michael: The Department of War Is Moving Faster Than Silicon Valley on AI | The a16z Show