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AI Daily Brief — 27 January 2025

Monday delivered the largest single-day market-cap loss in US stock-market history. NVIDIA fell 16.97% to close at $118.58, erasing approximately $589 billion in market value in one session. Broadcom dropped 17.4%, TSMC’s ADRs more than 15%, ASML around 8%, Micron 11%. The AI-power trade collapsed alongside: Vistra closed nearly 30% lower, Constellation and Talen and GE Vernova more than 20%. The Nasdaq Composite fell 3.1%. Apple retook the most-valuable-company crown at $3.5 trillion. The trigger was DeepSeek — at the #1 spot on the US App Store, with a sub-$6-million training-cost narrative and an open-weights license that flipped the script on the entire US AI capex thesis four trading days into the Trump-Stargate era.

Top stories

  • NVIDIA loses ~$589B in market cap — largest single-day loss in US stock-market history. NVDA fell 16.97% to $118.58, returning the most-valuable-company crown to Apple. NVIDIA’s market cap dropped to roughly $2.9 trillion; Apple’s sat at $3.5T. The session was NVDA’s worst since the March 16, 2020 COVID crash. via CNBC · via Bloomberg
  • The AI-power trade collapses alongside chips. Vistra closed nearly 30% lower, Constellation Energy more than 20%, Talen Energy more than 20%, GE Vernova more than 20%. BMO flagged DeepSeek-style models could require 50-75% less power than equivalent NVIDIA-GPU workloads — undercutting the AI-electricity thesis behind the Three Mile Island restart and similar deals. Broadcom -17.4%, TSMC ADRs -15%+, ASML -8%, Micron -11%. via CNBC
  • Trump calls DeepSeek “a wake-up call” but frames cheaper AI as positive. Speaking in Florida, the president said: “It should be a wake-up call for our industries that we need to be laser-focused on competing to win,” then added that cheaper Chinese AI was “a positive” — “instead of spending billions and billions, you’ll spend less.” via NBC News
  • Sam Altman breaks silence — R1 “impressive,” promises OpenAI will “pull up some releases.” Altman: “deepseek’s r1 is an impressive model, particularly around what they’re able to deliver for the price. we will obviously deliver much better models and also it’s legit invigorating to have a new competitor! we will pull up some releases.” via Sam Altman on X
  • Satya Nadella invokes Jevons paradox to defend AI capex. “Jevons paradox strikes again! As AI gets more efficient and accessible, we will see its use skyrocket, turning it into a commodity we just can’t get enough of.” Became the rallying cry for hyperscaler bulls arguing cheaper inference expands the market rather than shrinks chip demand. via Satya Nadella on X
  • DeepSeek hit by large-scale cyberattack, freezes new registrations. The lab limited sign-ups “due to large-scale malicious attacks on DeepSeek’s services” — believed to be a coordinated DDoS. Existing users could still log in; new registrations narrowed to mainland-China phone numbers, email, or Google login. via CNBC

Who shipped

On the lab side, Meta reportedly assembled four engineering “war rooms” to reverse-engineer DeepSeek’s training-efficiency gains and inform the Llama roadmap — the Western open-weights standard-bearer outflanked on its own turf by a Chinese lab operating under US chip export controls. Anthropic‘s Dario Amodei would publish his long “On DeepSeek and Export Controls” essay later in the week.

Open-source pulse

DeepSeek + Qwen2.5-VL (Sunday’s release) cross-platform on Hugging Face download charts. The R1 distilled variants — Qwen-based 1.5B/7B/14B/32B and Llama-based 8B/70B — were now the most-downloaded models on the Hub, runnable on laptops. The “open versus closed” axis was the day’s organising frame across X.

Money, infra & hardware

The session ended with the Nasdaq at 19,954 (back below 20,000). S&P 500 futures had been down ~1.9% pre-market and Nasdaq-100 futures off more than 650 points (-3.2%) overnight. The Stargate $500B commitment — announced six trading days earlier — was suddenly being re-tested in public as the DeepSeek narrative directly questioned whether that scale of capex was still warranted.

Quiet corners

arXiv produced no headline release on Monday; community attention sat entirely on R1, R1-Zero, the distilled checkpoints, and Qwen2.5-VL.

By the numbers

  • $589B — NVIDIA single-day market-cap loss (record)
  • -16.97% — NVDA close
  • -3.1% — Nasdaq Composite
  • $3.5T / $2.9T — Apple / NVIDIA closing market caps
  • -28% / -20%+ / -20%+ — Vistra / Constellation / Talen sessions
  • Most-mentioned company: DeepSeek
  • Most-mentioned phrase: “Sputnik moment”

Compiled by AI Feed’s editor from verified web sources for 27 January 2025.