Model releaseLimited global significanceConfirmed confidence
xAI releases Grok 4.20
xAI released Grok 4.20 with a published system card; an earlier draft entry for "Grok 4.2 (Feb 17, 2026)" had no verifiable official release record and has been corrected to the official one.
What happened
Event details
xAI released Grok 4.20 on April 7, 2026 and published its system card. The parameter count is undisclosed and the model is closed-source; it is classified as an autoregressive Transformer. The primary source is the "Grok 4.20 System Card."
Assessment
Why it matters
Rated on the impact-v1 six-axis scale: technical 2/5, market 2/5, ecosystem 2/5, policy & social 1/5, scope 3/5, durability 2/5.
45/100Global significance score. Regional effects are recorded only when the evidence supports a meaningful difference.