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xAI completes training of 1.5 trillion parameter Grok V9

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xAI completed training of its 1.5 trillion parameter Grok V9 model. The new system represents a substantial upgrade over the prior 0.5 trillion parameter V8 version. Training will continue with supplemental incorporation of Cursor data. This phase will be followed by supervised fine-tuning and reinforcement learning. xAI targets a public release of the model in three to four weeks.

Original post

We are improving the 0.5T Grok foundation model V8 (public version 4.3) every few days. The 1.5T V9 just finished training (incorrectly called pre-training) and is a major upgrade. Next, we are adding the Cursor data in supplemental training (others call this mid-training), then SFT and RL. About 3 or 4 weeks to release. This will be a banger.

12:33 AM · May 17, 2026 View on X
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We are improving the 0.5T Grok foundation model V8 (public version 4.3) every few days.

The 1.5T V9 just finished training (incorrectly called pre-training) and is a major upgrade. Next, we are adding the Cursor data in supplemental training (others call this mid-training), then SFT and RL. About 3 or 4 weeks to release.

This will be a banger.

7:33 AM · May 17, 2026 · 136.6K Views

🚀🔜

Elon MuskElon Musk@elonmusk

We are improving the 0.5T Grok foundation model V8 (public version 4.3) every few days. The 1.5T V9 just finished training (incorrectly called pre-training) and is a major upgrade. Next, we are adding the Cursor data in supplemental training (others call this mid-training), then SFT and RL. About 3 or 4 weeks to release. This will be a banger.

7:33 AM · May 17, 2026 · 136.6K Views
7:38 AM · May 17, 2026 · 1.8K Views

@elonmusk @orcdev oh fuck yes 🔥🔥

Elon MuskElon Musk@elonmusk

We are improving the 0.5T Grok foundation model V8 (public version 4.3) every few days. The 1.5T V9 just finished training (incorrectly called pre-training) and is a major upgrade. Next, we are adding the Cursor data in supplemental training (others call this mid-training), then SFT and RL. About 3 or 4 weeks to release. This will be a banger.

7:33 AM · May 17, 2026 · 136.6K Views
8:33 AM · May 17, 2026 · 731 Views

@elonmusk @brivael @orcdev 🚀

Elon MuskElon Musk@elonmusk

We are improving the 0.5T Grok foundation model V8 (public version 4.3) every few days. The 1.5T V9 just finished training (incorrectly called pre-training) and is a major upgrade. Next, we are adding the Cursor data in supplemental training (others call this mid-training), then SFT and RL. About 3 or 4 weeks to release. This will be a banger.

7:33 AM · May 17, 2026 · 136.6K Views
7:58 AM · May 17, 2026 · 719 Views

@elonmusk @orcdev any ETA?

Elon MuskElon Musk@elonmusk

We are improving the 0.5T Grok foundation model V8 (public version 4.3) every few days. The 1.5T V9 just finished training (incorrectly called pre-training) and is a major upgrade. Next, we are adding the Cursor data in supplemental training (others call this mid-training), then SFT and RL. About 3 or 4 weeks to release. This will be a banger.

7:33 AM · May 17, 2026 · 136.6K Views
9:58 AM · May 17, 2026 · 372 Views
xAI completes training of 1.5 trillion parameter Grok V9 · Digg