Grok 4.5 Enters Private Beta at SpaceX and Tesla

xAI

Models / LLM media only 4 src. ~1 min

xAI CEO Elon Musk announced on June 28 that Grok 4.5 has entered private beta at SpaceX and Tesla. Built on xAI's V9 foundation with 1.5 trillion parameters — a 50% increase over Grok 4.4 — the model incorporates supplemental training data from the Cursor coding platform. Early internal evaluations reportedly show Grok 4.5 performing at or above Anthropic Claude Opus on certain tasks. No public release date has been announced.

Why it matters

A 50% parameter jump and Cursor-data integration signals xAI's intent to release new model generations monthly through 2026. Testing inside SpaceX and Tesla gives xAI access to proprietary engineering data that could differentiate future versions.

Importance: 3/5

Grok 4.5 private beta announced by xAI CEO; 50% parameter increase, multiple independent media confirmations

grok beta coding agentic

Sources

media Grok 4.5 enters private testing at SpaceX, Tesla: Elon Musk — The Hans India

media Grok 4.5 enters private beta at SpaceX and Tesla with 1.5 trillion parameters — Crypto Briefing

media Grok 4.5 Enters Private Beta at SpaceX and Tesla — TechnoSports

secondary Elon Musk unveils Grok 4.5 private beta — BizzBuzz News