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20262020s
xAI Grok 4.5
xAI released Grok 4.5, a 1.5-trillion-parameter coding-focused model, on July 8, 2026, while its 6-trillion-parameter Grok 5 remained in training on Colossus 2.
Why It Mattered
Grok 4.5 — the 1.5-trillion-parameter model internally called V9 — arrived alongside xAI's Grok Voice (June 4) and the leaderboard-topping Grok Imagine Video 1.5, as the company's repeatedly delayed Grok 5 continued training on the 1-gigawatt Colossus 2 supercluster in Memphis. The release kept xAI competitive in the coding-model race and illustrated the industry pattern of shipping strong interim models while flagship runs at unprecedented scale remained underway.
Who Built It
xAI
Applications
- Coding
- Voice AI
- Video Generation