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Grok 4.5 已在 SpaceX 和 Tesla 进入私有 beta 测试 基于 xAI 1.5 万亿参数 V9 基础模型，额外加入 Cursor 代码训练数据。早期评估显示性能接近甚至可能超过 Claude Opus。RL 仍在持续显著提升模型，Grok Build harness 正针对真实 SpaceX/Tesla 工程环境进行迭代优化。 Elon 提到，一批顶尖 Starlink/Starship 工程师正把大量时间转向 AI，同时 SpaceXAI 今年每月将发布全新从头训练的模型。

To be clear, I’m not saying the Grok v9 foundation model will be mind-blowingly better than anything, but it will be a solid workhorse in the same league as Opus. And the SpaceXAI cadence of model and harness improvement is speeding up tremendously, particularly due to a few dozen of the top Starlink/Starship engineers shifting a much of their time to AI. Worth noting that the v8 foundation (Grok 4.3) model is a 0.5T model that finished training all the way back in December and has many fundamental flaws, so Grok 4.5 will feel like a gigantic upgrade!

Elon Musk turns 55 today. Here are 55 milestones. Age 54: world's first trillionaire Age 54: takes SpaceX public Age 54: SpaceX acquires xAI Age 54: releases Grok 4 Age 53: launches Robotaxi service Age 53: xAI acquires X Age 53: catches Starship booster Age 53: unveils Cybercab Age 53: first private spacewalk Age 53: Colossus supercomputer Age 52: first Neuralink implant Age 52: launches Grok Age 52: rebrands Twitter as X Age 52: founds xAI  Age 51: launches first Starship Age 51: buys Twitter Age 50: flies first all-civilian crew Age 50: unveils Optimus robot Age 49: wins NASA moon contract Age 48: launches crew to orbit Age 48: ships Tesla Model Y Age 48: unveils Cybertruck Age 48: launches Tesla Megapack Age 47: first Starlink satellites Age 46: launches Falcon Heavy  Age 46: unveils Tesla Semi  Age 45: starts Boring Company  Age 45: opens first Gigafactory  Age 45: founds Neuralink  Age 45: unveils Solar Roof  Age 45: reflies Falcon 9  Age 44: reveals Tesla Model 3  Age 44: lands a rocket booster Age 44: co-founds OpenAI  Age 44: ships Tesla Model X  Age 43: unveils Powerwall  Age 43: launches Tesla Autopilot  Age 41: opens first Superchargers  Age 40: ships Tesla Model S  Age 40: Dragon reaches ISS  Age 39: Dragon reaches orbit  Age 39: takes Tesla public (IPO)  Age 38: Falcon 9 first flight  Age 37: Falcon 1 reaches orbit  Age 36: ships first Tesla Roadster  Age 35: co-founds SolarCity  Age 32: co-founds Tesla  Age 31: sells PayPal to eBay  Age 30: founds SpaceX  Age 30: takes PayPal public  Age 27: founds X dot com Age 27: sells Zip2 to Compaq  Age 24: co-founds Zip2  Age 19: sells PCs in dorm Age 12: codes video game Blastar

🚀 Historic! The Starship's Super Heavy was perfectly captured by the Mechazilla tower without touching the ground! Approximately 70 meters high and weighing over 200 tons, it descended with surgical precision.

For half a century, the 7.6 million pounds of thrust from the Saturn V was the absolute ceiling of human engineering SpaceX is now treating that as a baseline “Starship V3 is more than double the thrust of the Saturn V… By V4, we’ll be pretty much three times” — Elon Musk SpaceX’s first-principles engineering is on another level