Breaking

xAI Runs Grok 4.5 in Private Beta Inside SpaceX and Tesla

July 2, 2026 at 13:33 EDT

Foundation Models
Software Dev & Coding

Elon Musk said on June 28, 2026 that xAI's next model, Grok 4.5, has entered private beta inside SpaceX and Tesla. Built on a new 1.5-trillion-parameter foundation model called V9, its public release date remains unannounced.

June 28, 2026 · xAI

Grok 4.5 Enters Private Beta — No Public Access, No Independent Benchmark

Built on xAI's 1.5-trillion-parameter V9 foundation model, Grok 4.5 is limited to SpaceX and Tesla internally. Early evaluations claim performance near Claude Opus — but third-party verification is not yet possible.

1.5T

V9 foundation model parameters

~3×

Larger than prior v8-small (500B)

Independent benchmarks submitted

Foundation model scale, generation over generation

Each block = 500 billion parameters

500B

v8-small (prior)

1.5T

V9 (Grok 4.5)

next gen (planned)

How Grok 4.5 was built

~May 26, 2026

Pre-training complete

V9, 1.5T parameters

→

Supplemental

Cursor data added

Late — may be less effective than early integration

→

Ongoing

RL continues

Performance still improving

Anticipation

Claimed to match or exceed Anthropic's Claude Opus. Strong real-time search, native tool use, and an aggressive plan to ship a fresh foundation model every month through 2026.

Skepticism

Private-only, no submitted benchmark, no public release date. Doubts over whether a monthly cadence can sustain quality — plus prior weakness against Claude in coding.

Availability today

Internal private beta at SpaceX & Tesla only — no public access, no API, and a public release date remains undecided.

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