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Yuchen Jin
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Yuchen Jin
@Yuchenj_UW
Cooking fun AI systems & products @databricks. Prev: co-founder & CTO @ Hyperbolic, OctoAI (acquired by @nvidia) Apache TVM, PhD @ University of Washington.
another Galaxy
yuchenjin.github.io
Joined November 2016
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  • Pinned
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    Yuchen Jin
    @Yuchenj_UW
    Jun 1, 2024
    Outperform GPT-3 with @karpathy's llm.c using just 1/3 training tokens ✨ Another day has passed, and I trained GPT-2 (124M) with llm.c for 150B tokens, achieving 35.5% accuracy on HellaSwag. This surpasses the GPT-3 paper’s 33.7% accuracy trained for 300B tokens. It matched the
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    Andrej Karpathy
    @karpathy
    May 30, 2024
    Apparently today is the 4th year anniversary of GPT-3! arxiv.org/abs/2005.14165 Which I am accidentally celebrating by re-training the smallest model in the miniseries right now :). HellaSwag 33.7 (Appendix H) almost reached this a few steps ago (though this is only 45% of the
    2.3M
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    Yuchen Jin
    @Yuchenj_UW
    Apr 27, 2025
    I saw a guy coding today. Tab 1 ChatGPT. Tab 2 Gemini. Tab 3 Claude. Tab 4 Grok. Tab 5 DeepSeek. He asked every AI the same exact question. Patiently waited, then pasted each response into 5 different Python files. Hit run on all five. Pick the best one. Like a psychopath. It's
    7.2M
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    Yuchen Jin
    @Yuchenj_UW
    Oct 31, 2025
    PewDiePie in 2025: – built a 10×4090 rig – runs Llama 70B, gpt-oss-120B & Qwen 245B locally via vLLM – built a custom web UI (chat, RAG, search, TTS) – ran protein-folding simulations for charity – created an AI “council”, a swarm of 64 models – now fine-tuning his own model
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    10M
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    Yuchen Jin
    @Yuchenj_UW
    Jun 2, 2025
    >went to a Miami restaurant >12K Google reviews, 4.9 stars >food is mid >bill arrives, way higher than menu prices >"sir, we added 20% service fee + 2% resort tax" >we only 2 people! >wtf_is_resort_tax.jpg >tablet flips around >"Choose your tip: 18%, 20%, 25%" How is this legal?
    3.5M
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    Yuchen Jin
    @Yuchenj_UW
    Sep 12, 2025
    How money works: 1. OpenAI signs $300B GPU deal with Oracle 2. Larry gains $100B (no GPUs shipped) 3. Larry invests in OpenAI’s $1T round 4. Sam uses $300B to pay Oracle 5. Oracle stock pumps again 6. Larry makes another $100B 7. Larry invests in OpenAI Flywheel go brrr.
    1.8M
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    Yuchen Jin
    @Yuchenj_UW
    Feb 4, 2025
    judging an engineer by age is BS - Linus Torvalds wrote Linux at 21 - Steve Wozniak built Apple I at 25 - Palmer Luckey created Oculus VR at 20 - Vitalik Buterin designed Ethereum at 19 - Mark Zuckerberg coded Facebook at 19 Looking back, I realize that 18-25 is the peak time.
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    2.5M
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    Yuchen Jin
    @Yuchenj_UW
    Sep 11, 2025
    “OpenAI signed a $300 Billion GPU data center deal with Oracle.” > Larry Ellison gained $101B in one day > now the richest man alive. > but Sam doesn't have $300B > Larry doesn't have $300B worth of GPUs. We’re living in a simulation.
    1.5M
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    Yuchen Jin
    @Yuchenj_UW
    Oct 10, 2025
    Interviewed an engineer. I’m 99% sure he was using Cluely. He’d pause for 3 seconds, stare into the void before every answer, then drop a perfectly structured 5-paragraph essay, with zero soul. I miss interviewing humans.
    1.2M
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    Yuchen Jin
    @Yuchenj_UW
    Jun 4, 2025
    They're just like human programmers.
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    698K
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    Yuchen Jin
    @Yuchenj_UW
    Aug 12, 2025
    “skill issue” 💀
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    1.1M
  • user avatar
    Yuchen Jin
    @Yuchenj_UW
    Apr 27, 2025
    Replying to @Yuchenj_UW
    he was right fr fr
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    759K
  • user avatar
    Yuchen Jin
    @Yuchenj_UW
    Dec 24, 2024
    USCIS just denied my US green card application. claiming my work lacks impact "beyond that of Apple, Inc." -- even though they acknowledge that I am the Apple CTO. WTF? I have NEVER worked at Apple! I got my cs PhD, cofounded an AI startup, and raised $20M. Yet, after waiting
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    4M
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    Yuchen Jin
    @Yuchenj_UW
    Jun 17, 2025
    Sam Altman says Meta is offering $100M signing bonuses to OpenAI staff. Not $100M annual compensation, just the signing bonus! He clowned Meta: “that’s not how you build a great culture.” Also said none of OpenAI’s best people are leaving. This AI talent war is crazy.
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    6.2M
  • user avatar
    Yuchen Jin
    @Yuchenj_UW
    Oct 29, 2025
    SoftBank was the largest shareholder of Nvidia. But they sold their entire 4.9% stake in Nvidia in 2019 for $3.6B. Nivida stock hit $5T today. Masa lost $250B. Jensen Huang making fun of Masa right in front of him makes me laugh so hard every time, lmao!
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    1.9M

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