Grok 4.3 beta is now available for Heavy subscribers! Musk: The true flagship version will finish initial training in 5 days.

ORIGINALGrok 4.3 beta 開放 Heavy 訂閱用戶！馬斯克：真正旗艦版本初訓 5 天後完成

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DirectionBullish — Grok 4.3 beta is now open for testing, with Elon Musk teasing that the flagship version is nearing completion.

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Grok 4.3 beta has been available to SuperGrok Heavy subscribers ($300/month) since April 17. On the 18th, X user Mark Kretschmann posted that this version features 1T parameters, double the size of Grok 4.20. Elon Musk immediately clarified in the same thread that the true 1T flagship is 5 days away from finishing its initial training. (Previous coverage: SpaceX lost nearly $5 billion after merging with xAI! Burning $1 billion in compute costs every month) (Background: Musk shows AI5 chip design complete, Dojo3 revived, Tesla AI6 in development) Grok 4.3 beta appeared in the Grok.com dropdown menu labeled "Early Access," available only to $300/month SuperGrok Heavy subscribers, while regular $30 SuperGrok plan users can only see it. This version can handle PDF, PPT, and Excel generation, as well as video input and enhanced reasoning, with the context window jumping from the previous 128K to 2M tokens (!!). This is still 0.5T, but a more recent training checkpoint. 1T model is ~5 days away from finishing initial training. Will be a major step change improvement in coding, long context and skills. The SpaceXAI model factory is finally working. Should be an improved base model… — Elon Musk (@elonmusk) April 18, 2026 Today, X user Mark Kretschmann stated that this version features 1T parameters, twice that of Grok 4.20, with a significantly longer training time. A few hours later, Musk replied to clarify: "The current 4.3 (beta) is still 0.5T, just a more recent training checkpoint." 1T flagship version is 5 days away from finishing initial training In his clarification, Musk added that this version will bring a step function level of improvement in coding, long context, and various skills. SpaceXAI factory is running 7 models simultaneously, with the largest scaling up to 10T Musk revealed that the SpaceXAI Colossus 2 model factory is operational, currently training: two 1T models, two 1.5T models, one 6T model, one 10T model, and the Imagine V2 image model. The 10T pre-training is expected to take another two months. Grok Computer launched simultaneously Launched alongside Grok 4.3 beta is Grok Computer, xAI's autonomous PC agent capable of operating applications, filling out forms, and executing multi-step desktop tasks. Grok 4.3 serves as the reasoning engine, while Grok Computer acts as the action layer, with a wider beta now open to some SuperGrok accounts.

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