Grok 4.20 coming next week, says xAI Founder Elon Musk

xAI Founder and CEO, Elon Musk, announced that Grok 4.20 will launch next week, describing it as a “significant improvement” over Grok 4.1. The word “finally” in his post hints at anticipation and past setbacks.

The launch was delayed due to challenges during training. In late January, Musk explained that extreme cold weather and construction accidents caused power outages, pushing Grok 4.20’s completion from early to mid-February.

Early checkpoints of Grok 4.20 have already impressed in real-world tests. One preview ranked #2 on ForecastBench’s global AI forecasting leaderboard, outperforming models like GPT-5 and Claude Opus 4.5. Another test showed it dominating the Alpha Arena with a +34.59% return in stock trading simulations—far ahead of competitors. Musk noted that the largest variant was still training, with even stronger performance expected.

This builds on Grok 4.1’s strong foundation, which excelled in agentic tasks, topping search benchmarks with tools like web browsing and code execution. It also achieved massive results in creative writing (1722 Elo on Creative Writing v3), emotional intelligence (1586 on EQ-Bench), and reduced hallucinations by 3x compared to prior models.

The update promises enhanced reasoning, multimodal capabilities, and real-time integration with X data. Grok 4.20 positions xAI against rivals, focusing on practical intelligence like forecasting and tool use. It appears that the company has finally marked a major milestone in training, and we could see a breakthrough with Grok 4.20 releasing next week.