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Galen Guan

Daily Briefing · 2026-09-19: Buffett Hands Over, Yuan Breaks 6.7, AI Safety Week

Daily Briefing · 2026-09-19 (Saturday)

Coverage window: the past 24 hours (Beijing time, Sep 18 06:00 – Sep 19 06:00). Market data is the Sep 18 close / overnight US close.

🗞️ Top Story

Buffett steps down as Berkshire chairman, ending a 56-year era. Berkshire Hathaway announced Friday that Warren Buffett, 96, immediately becomes honorary chairman while remaining a director; his son Howard Buffett, 71, takes over as chairman under the long-planned succession. "Time is the winner in the end — but it has been very kind to me," Buffett wrote in his shareholder letter. The handover is now essentially complete: he gave up the CEO role at the end of 2025, with Greg Abel running day-to-day operations, and after roughly nine more months as chairman the title has passed as well. Buffett drew a clean division of labor: "Greg runs the company; Howard will guard the culture and the values — worth more than anything on our balance sheet." (CLS)

🏛️ Politics / Geopolitics

  • Beijing on a possible leaders' summit: at Friday's foreign ministry briefing, spokesperson Guo Jiakun said "the two sides remain in communication about head-of-state interaction arrangements within the year," without confirming dates. (CLS)
  • Middle East remains the swing variable: JPMorgan analysts say the economic red lines set earlier have been breached and the conflict's outcome is now unpredictable; oil fell back from intraday highs after Trump said the US is negotiating with the Houthis. The CBO earlier put the US-Iran war bill at $38.1B and counting.
  • China's State Council reiterated implementation of the national strategy on population aging (Sep 18).
  • South Korea: grid bottlenecks have delayed grid-connection for 72% of newly approved wind and solar projects; SK Hynix's subsidiary is weighing a US NAND plant.

💰 Finance / Markets

Market snapshot (Sina Finance, overnight Sep 19):

Index Close Change
S&P 500 7,650.50 +0.17%
Nasdaq 26,522.55 +0.39%
Dow Jones 51,682.64 −0.18%
Shanghai Composite 3,911.87 +0.94%
CSI 300 4,507.39 +1.06%
USD/CNY 6.697 yuan breaks 6.7
Brent above $100, off intraday highs see CLS
  • The yuan broke through 6.7 per dollar, its strongest since January 2023, with the fixing rising for an eighth straight session. Analysts attribute the strength to the trade account — robust exports and persistent FX conversion demand — and expect a "rise first, then stabilize" path for the year. (CLS)
  • Wall Street wraps a volatile week: Friday's AI-chip rally lifted the Nasdaq and S&P, but markets now price a 55.4% chance of another Fed hike in October as oil-driven inflation builds; BofA strategists flag the funds rate potentially exceeding 5%. The BoJ has already hiked to a 31-year high.
  • A-shares surged: the Shanghai Composite reclaimed 3,900; securities stamp duty for Jan–Aug hit 216B yuan, up 82% YoY; public fund AUM approaches 40 trillion yuan.
  • Companies: Porsche's writedown forces Volkswagen to slash profit guidance; Lilly's trillion-dollar market cap draws a $1,400 price target; Chinese AI firm Zhipu closed a ~HK$40B round.

🤖 Tech / AI

  • Anthropic builds a wet lab: the company has constructed a biology wet lab in the San Francisco Bay Area, moving beyond simulation into real experiments, and is exploring having Claude direct robotic experiments. Life sciences is already one of its most resource-intensive areas. (CLS)
  • Compute strategy shifts to "small and fast": beyond gigawatt-scale deals, Anthropic and OpenAI are negotiating 20–30 MW deployments in the UK, the Nordics and the US to get capacity online faster; Nscale, backed by Nvidia, has filed for a US IPO. JLL projects inference will take 37% of global data-center capacity by 2030. (CLS)
  • California moves toward a mandatory AI kill switch: Governor Newsom signed an executive order Friday to fast-track SB 813 and AB 1405 (third-party safety assessments) and study requiring an "emergency shut-off mechanism" for frontier models, urging Washington to adopt California's framework as a federal floor. (CLS)
  • Industry self-regulation heats up: more than a hundred experts signed an open letter calling on AI giants to strengthen independent safety evaluations — the same thread that produced this week's regulatory momentum.
  • China: tens of billions of yuan are flowing into "world model" startups; the AI-phone race shifts to on-device models; Google and Meta are investing in long-duration energy storage.

✍️ Thinkers

  • No major new long-form essays in the past 24 hours. This week's AI-safety discourse is the backdrop worth reading: ex-DeepMind alignment researcher Chughtai and Anthropic's Coxon/Hubinger issued public warnings (Sep 14–16) that directly catalyzed California's executive order and the expert letter.
  • With Berkshire's succession settled, commentary now focuses on whether Howard Buffett can truly serve as the "guardian of value" culture.

📚 24h Blog Updates

Blog Status
Anthropic Engineering Content updated Sep 18; SPA titles not extractable from static HTML
Lilian Weng / Cognition / Manus / Chip Huyen / Baoyu / Qwen No updates in 24h (Saturday — normal weekend silence)
DeepSeek No new posts
kexue.fm Still blocked

🐙 GitHub Trending (3-day window, created ≥ Sep 15, spam filtered)

Filtering note: ~40% of the 44 candidates in the 3-day window were removed as crypto bots and Jev clones.

📄 arXiv cs.AI

Weekend pause — the latest batch is Sep 17 (Thursday); nothing new within 24h. Representative work: Coding Agents with an Obstacle-Aware Harness for Safe Robot Manipulation (using coding agents to generate safe robot-controller programs).

📌 One-line Takeaway

Three storylines for Saturday: the Buffett era formally changes hands, a strengthening yuan and A-shares against a global rate-hike wave, and AI safety moving from verbal warnings to a California executive order and an industry-wide letter.

References

  1. CLS · Buffett steps down as Berkshire chairman
  2. CLS · Yuan breaks 6.7 against the dollar
  3. CLS · US close: AI chips lift the Nasdaq
  4. CLS · Anthropic builds a wet lab
  5. CLS · AI giants eye small-scale compute deployments
  6. CLS · California moves to toughen AI oversight
  7. CLS · Foreign ministry on possible leaders' meeting
  8. Sina Finance quotes API (hq.sinajs.cn, fetched 2026-09-19 06:00 CST)