Breaking

xAI Puts Grok 4.5 Into Internal Testing at SpaceX and Tesla

June 28, 2026 at 13:30 EDT

Foundation Models
Software Dev & Coding

On June 28, 2026, xAI revealed that its latest model, "Grok 4.5," is running as a private beta inside SpaceX and Tesla. It also outlined a plan to release a newly trained model every month through 2026.

June 28, 2026 · xAI

Grok 4.5 Enters Private Beta Inside SpaceX and Tesla

Built on xAI's 1.5-trillion-parameter V9 foundation model with Cursor data added for coding, Grok 4.5 is offered only for internal use — with Musk pledging fresh, from-scratch models every month through 2026.

1.5T

Parameters in the V9 foundation model

Internal users: SpaceX & Tesla only

Planned from-scratch models — one per month in 2026

Scaling the foundation model

Parameter count, Grok 4.4 → Grok 4.5

1.0T

Grok 4.4

1.5T

Grok 4.5

A 50% jump in parameters — plus supplemental training on Cursor data to sharpen coding and technical reasoning.

The claim

Early internal evals report performance close to — and perhaps exceeding — Anthropic's Claude Opus. Musk says RL keeps improving the model daily.

The caveat

No benchmark tables, system card, or API access published. As a private beta, there is little outside verification of the parity-with-Opus claim.

From internal beta → external proof

Private beta
SpaceX & Tesla

→

Monthly cadence
new models in 2026

→

External verification
the open question

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