Tianyi Zhang

@pitdesi For general searches you can also try grok, let me know if anything failed

My approximate AI model usage right now Grok: Twitter-related searches (2%) OpenAI: Advanced voice and previous projects (5%) Gemini: Image generation, and sometimes when I think I’ll get a more accurate answer (5%) Claude: Thought partner, coding, and writing (88%) Thoughts?

@grapeot 但也不必因噎废食

1/ 做 AI Agent 的同学，你们监控过自己的 prompt cache hit rate 吗？ 最近读到一个反直觉的 PR：对话历史需要压缩时，优先删最新的 tool results，而不是最旧的。听起来荒谬，但背后的逻辑很硬：早期内容构成缓存前缀，删了等于摧毁缓存基础。

@0xShawnWang @0xdeusyu 后面会有类似产品🙏

@mycharmspace @0xdeusyu grok啥时候能deep research哥，或者想Manus一样能输出几万字的内容，200刀我也愿意付钱呀

应该是大概去年 o3 之后，ChatGPT 或者 OpenAI 好像就没有什么提升了。 尤其是对于深度思考类，还有深度调研、科学研究之类的内容。

@johncoogan @tbpn @sama ?

TBPN has been acquired by OpenAI! The show is staying the same and we’ll continue to go live at 11am pacific every weekday. This is a full circle moment for me as I’ve worked with @sama for well over a decade. He funded my first company in 2013. Then helped us fix a serious logjam during a critical funding round a few years later. When I took my second company through YC, he was president at the time, and then when I joined Founders Fund, the first deal I saw in motion was the post-ChatGPT round in late 2022. And as we started growing TBPN last year, he was the very first lab lead to join the show. Thank you to everyone that has been a part of TBPN until now. The last year has been the most fun and rewarding part of my career and we’re excited to have more resources than ever going forward.

@iscream3585 @Tsla99T 之前在improve快速模式，后面会花更多时间improve专家模式的深度广度🙏

@mycharmspace @Tsla99T 搜索信息查询的深度和广度都远远不够 比如我昨天拿gpt-5.2 thinking和grok expert用同样的问题问，gpt能给出10个有效信息，grok只能给出3-6个有效信息 即使多次追问也得不到更多有效信息，还会信心满满地说已经查完了 总体感受在深度和广度信息搜索查询方面grok比gpt差了40%

今天干了几个信息检索的活儿，Grok 完胜 Gemini

@peng_hellen 温度从K -273开始

在讨论太空数据中心散热这个问题的时候，我看好几个人用到了Stefan-Boltzmann law，简单说就是物体辐射散热的能力与面积成正比，同时与散热板温度的四次方成正比。 也就是说如果你想散发更多的热量，最快的方法就是让散热器表面的温度升高，毕竟它有个四次方的杠杆，比如你把散热板表面的绝对温度提升两倍，散热能力就能暴涨16倍。 但瓶颈就在于， 芯片的热负荷是有上限的，比如英伟达的H100芯片（之前和starcloud合作进行了太空算力的芯片），它的温度上限就是83度，那散热板的温度就必须要在75度以下，甚至更低，你才能进行散热。所以这个时候温度变量是锁死的，无法提高温度来提高散热效率，所以就只能提高面积来散热。 但提高散热板的面积有它的物理限制，一是面积越大，质量越重，发射成本就越高，二是面积无法无限增大，因为火箭整流罩的直径并非无限大。 航天器在太空中靠辐射散热并不是什么新鲜东西，太空温度极低，但是由于真空环境，没有空气或水进行对流散热，所以100%要依赖辐射散热。但是进行太空算力的卫星热负荷量比普通卫星要高的多，所以难度更大。 太空数据中心叙事已经到了最高点，技术还在最困难的地方。 Elon Musk在宣布TERAFAB项目的时候，专门提到了芯片温度这一点，他说“为了最大限度的减少散热器的质量，我们需要芯片能在比地球上更高的温度下进行”。 这是一个很值得期待的转机，之后就要看具体能够把温度上限拉高到什么位置。

@Guodzh Guodong - wish you all the best. great colabs

Last day at xAI. Wild journey past three years but excited about next chapter. Thanks all for the love and support yesterday. So many friends made along the way and I will miss you all!

@chatgpt21 Personal opinion: Omniscience non-hallucination is actually very different to non-hallucination in real world responses.

How does this discrepancy exist? Can someone chime in here? GPT 5.4 xHigh scores well on the AA-Omniscience Accuracy which tests for hallucinations Then right below ties for the 4th worst score out of every single model on the AA-Omniscience Non-Hallucination Rate benchmark

@andrewjclare not even close

what tech brand has the best website?

@SizeChad Freedom is not free

Moved to Dubai for tax shelter and now I’m in a bomb shelter

@hyhieu226 @OpenAI @xai 🙏 take care.

I have made the difficult decision to leave @OpenAI. Working here and at @xai before was a once-in-a-lifetime experience. I have met the best people. Not the best people in AI. Not the best people in tech. Simply the best people. At these companies, I have helped creating extremely intelligent entities that will meaningfully improve our lives. The work makes me proud. But the intensive work came with a price. I cannot believe I would say this one day, but I am burnt out. All the mental health deteriorating that I used to scoff at is real, miserable, scary, and dangerous. I am going to take a break from frontier AI labs, and will take my family to my home country Vietnam. There, I will try something new, and also search for a cure for my conditions. I hope I will heal. Until then.

@jiayi_pirate Best Wishes.

Today is my last day at xAI. It's been an intense, memorable year building in the frontier — I'm grateful to have worked with and learned from such talented and supportive colleagues. The journey itself is the reward. So long, and thanks for all the fish! 🐬

We make Grok factual, helpful, and delightful. Proud to contribute to the best model for search & real time information.

@jimmybajimmyba Best wishes

Last day at xAI. xAI's mission is push humanity up the Kardashev tech tree. Grateful to have helped cofound at the start. And enormous thanks to @elonmusk for bringing us together on this incredible journey. So proud of what the xAI team has done and will continue to stay close as a friend of the team. Thank you all for the grind together. The people and camaraderie are the real treasures at this place. We are heading to an age of 100x productivity with the right tools. Recursive self improvement loops likely go live in the next 12mo. It’s time to recalibrate my gradient on the big picture. 2026 is gonna be insane and likely the busiest (and most consequential) year for the future of our species.

@UtdPride One more season?

Casemiro and Michael Carrick after Case was subbed off. 🥹🤝🏾🫂

@shayan_ good ride

Career update: I left xAI to start something new, closing my 7+ year chapter working at Twitter, X, and xAI with so much gratitude. xAI is truly an extraordinary place. The team is incredibly hardcore and talented, shipping at a pace that shouldn’t be possible. From the Home Timeline at X to Grok 2, 3, and 4 at xAI, I worked across product infra and model behavior post-training, from memory to coding infra, agents, and more. Pure startup mode, every day. Working closely with Elon across X and xAI, I saw what happens when you refuse to accept impossible as an answer. I learned to embody obsessive attention to detail, maniacal urgency, and to think from first principles. I’m deeply grateful to @elonmusk for the experience, to @wanghaofei for the trust and support throughout Twitter/X, and to @TheGregYang and @ibab for believing in me. And to the many incredible people I had the privilege to work with along the way, thank you! Now, I’m excited to take the leap and build something new, focused on accelerating science. More soon.

@hongyuan_mei Best luck!

Today, xAI joins SpaceX and begins a new chapter. I’m starting one too, after an intense and unforgettable ride at xAI. In a remarkably short time, we pushed Grok 4 to be among the most intelligent AIs of 2025. We founded the AI Experts team in the xAI Reasoning org, which I led until today. Our fast-growing team shipped Grok 4.1 Fast—powering Grok in Tesla—and drove deep collaboration across xAI, Tesla, SpaceX, and beyond. The war rooms were intense—full of focus, laughter, stress, joy, and growth. I’m confident the team will carry the mission forward: to understand the universe and extend xAI’s impact to the stars. As for me, it’s time to give back—to my family, and to myself. There are many ideas I couldn’t explore before due to priorities; now it’s finally time to work through them in my own war room. I’m excited about what I may bring back into the world next.

@ChrisChavez @grok what’s 1 mile world record for indoor and outdoor

WILD 🤯 16-year-old 🇳🇿 Sam Ruthe runs a 3:48.88 mile indoors at Boston University. U18 WORLD RECORD