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Open Source vs. Closed Source, Memory Chips Eat AI Profits, Comcast Restructures | Diet TBPN

June 29, 2026

AI Summary

5 min read

Open Source AI Resets the Race, Memory Chips Squeeze AI Profits, and Comcast Splits

The Wall Street Journal front page told the story: China's Z.AI released GLM 5.2, an open-weight model that matches the latest U.S. frontier models on security bug finding, and the geopolitical implications are now landing in Washington. "This is how you know this is the whole AI 2027 Washington waking up," the host noted. The model can be downloaded and run anywhere, on any hardware, by anyone — including hackers who want to run it in the shadows. Security researchers at Semgrep found that GLM 5.2 bested Anthropic's Claude Opus 4.8 on certain benchmarks, and with further instructions the two models can match. OpenRouter data shows GLM 5.2 has ranked among the top 10 most-used AI models, a sign of real developer adoption.

The Open Source Debate Returns

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What you'll learn

  • 1 (00:02) **China's Open-Source AI Resets the Race** - GLM5.2 from Z.ai matches U.S. frontier models on security benchmarks, reigniting the open vs. closed source debate.
  • 2 (05:27) **Analyzing the Benchmark Chart** - Tyler explains the ELO-based chart from the Center for AI Standards and Innovation, which shows U.S. models ahead but with a contested gap.
  • 3 (07:43) **Revisiting the Closed-Source Thesis** - John Ludig's 2024 prediction that open-source would lose the capex war is re-evaluated in light of China's strategy.
  • 4 (12:30) **Tyler's Review of GLM5.2** - A deep dive into the model's performance, distillation concerns, and market fit.
  • 5 (19:00) **Google Restricts Meta's Gemini Access** - Capacity constraints force Google to limit Meta's use of Gemini, disrupting internal AI projects.
  • 6 (21:37) **Meta's Brain-Computer Interface Milestone** - Brain-to-Cord V2 can decode words and semantics from raw brain signals in real-time using a non-invasive device.
  • 7 (23:53) **How Terry Semmel Fumbled Yahoo's Facebook Deal** - The story of Zuckerberg agreeing to sell for $1B in 2006, only for Semmel to cut the offer to $800M.

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Show Notes

Diet TBPN delivers the best of today’s TBPN episode in 30 minutes. TBPN is a live tech talk show hosted by John Coogan and Jordi Hays, streaming weekdays 11–2 PT on X and YouTube, with each episode posted to podcast platforms right after.


Described by The New York Times as “Silicon Valley’s newest obsession,” the show has recently featured Mark Zuckerberg, Sam Altman, Mark Cuban, and Satya Nadella.


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