Models
Grok (4.5)
xAI's model family, notable for tight integration with X (formerly Twitter) and one of the largest disclosed training clusters in the industry.
Model Facts
Provider
xAI
Released
July 8, 2026
Context window
128K tokens
Weights
Closed
Artificial Analysis Intelligence Index
53
What it is
Grok is xAI's model family, deeply integrated into X, where it's directly available to platform users alongside the standalone Grok app and API. Elon Musk founded xAI in 2023 specifically to build a competitor to the other frontier labs, and Grok has scaled up quickly relative to how young the lab is compared to OpenAI, Anthropic, or Google DeepMind.
Where these numbers come from
Grok 4.5, released July 8, 2026, is xAI's current flagship. The Artificial Analysis Intelligence Index score above reflects the prior Grok 4.3 generation as reported by independent benchmark aggregators — this entry is a seed example and should be updated via the admin dashboard once official Grok 4.5 benchmarks are published and confirmed.
Notable traits
- Tight integration with X gives it access to more real-time social-media content than models trained purely on periodic web-crawl snapshots.
- xAI has trained recent Grok generations on very large dedicated GPU clusters, reported among the largest single training clusters disclosed publicly by any lab.
- Positioned by xAI as more willing to engage with contentious or edgy topics than some competitors' more conservatively-tuned assistants.