Breaking

'Grok 4.5' Surfaces on xAI's Site as SpaceX/Tesla Private Beta Begins

July 6, 2026 at 15:31 EDT

Foundation Models
Software Dev & Coding
AI Agents

References to "Grok 4.5" and upsell prompts have appeared on xAI's Grok website (grok.com) and in Grok Build, signaling that a rollout of the next foundation model is being prepared. xAI says the model is currently in an internal private beta with SpaceX and Tesla teams.

Unconfirmed · xAI Grok

"Grok 4.5" Surfaces in the UI — But xAI Has Said Nothing

Phrases like "Unlock the full power of Chat with Grok 4.5" and "SOON" appeared in Grok Web. No official announcement, no specs, no release date — only traces from feature flags and placeholders.

~1.5T

estimated parameters on the new "V9" foundation (per reports)

public benchmarks released for Grok 4.5

token context window on the official 4.3 flagship

Availability gap: two very different states

Grok 4.5

Private beta only — inside SpaceX & Tesla

Grok 4.3

Generally available to everyone

The distance between internal use and public release is exactly what has drawn attention.

Reported vs. official

Grok 4.5 — per reports

Private beta at SpaceX & Tesla
V9 foundation, ~1.5T parameters
Extra training on Cursor developer data
No public benchmarks

Grok 4.3 — official

Generally available
Foundation undisclosed
No extra training stated
1M-token context, published pricing

Expectation

Developers anticipate stronger coding performance from the use of Cursor data and the parallel Grok Build harness improvements.

Skepticism

No independent benchmarks exist. Current information is only "traces" from screenshots and quotes — verification is still needed.

What to watch next

Official xAI announcement → External availability timing → Public benchmarks

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