# Grok 4.5 enters private beta at SpaceX and Tesla

> Grok 4.5 entered private beta at SpaceX and Tesla on 28 June with no benchmarks or system card.

*The brief: xAI's biggest model yet is live for insiders only — with no benchmarks to back Musk's 'beats Opus' claim.*

By The FeaturedDaily Desk · FeaturedDaily
Canonical: https://featureddaily.com/news/grok-4-5-private-beta-brief

> **Key:** xAI's Grok 4.5 is in private beta at SpaceX and Tesla — a 1.5-trillion-parameter model Musk says rivals Claude Opus, though xAI has published no benchmarks and no system card.

## What happened

Elon Musk announced on X on 28 June 2026 that xAI's Grok 4.5 had entered private beta at SpaceX and Tesla — the first confirmed deployment of the model inside his companies, ahead of any wider release. It runs on xAI's ninth-generation **V9** architecture, which finished pre-training on 26 May 2026 at 1.5 trillion parameters — roughly three times the v8-small model that serves Grok on X and in Tesla today. xAI reportedly added Cursor coding data in supplemental training, pointing to a focus on code and technical reasoning.

> Grok 4.5 has no public access and no independent benchmark; the only evaluators are SpaceX and Tesla engineers, and xAI has released neither benchmark scores nor a system card.
> — [Tech Times](https://www.techtimes.com/articles/319314/20260629/grok-45-enters-private-beta-spacex-tesla-no-public-access-no-independent-benchmark.htm), 2026-06-29

## The catch

Musk claimed early evaluations put Grok 4.5 close to, or above, Anthropic's Claude Opus — but that is an unverified claim. xAI has published no benchmarks and no system card; the only evaluators are SpaceX and Tesla engineers at Musk's own companies; and no independent benchmark such as LMArena, Artificial Analysis or SWE-bench has scored it. For now, the 'beats Opus' line is a claim, not a measured result.

## What's next

xAI has said it plans to release a new from-scratch foundation model every month through the end of 2026, with monthly V9 variants — 4.5, 4.6, 4.7 — feeding a larger Grok 5 on its Colossus 2 supercluster. Watch for the first version that reaches the public, and whether it ships with benchmark scores attached.

One more caveat worth flagging for readers weighing the hype: a 'private beta' inside the maker's own companies is not the same as a launch, and a founder's word is not the same as a benchmark. Until Grok 4.5 reaches outside developers, or an independent lab publishes a score, treat it as a capability claim in progress — not a model you can yet compare against Claude Opus, buy, or build a product on. The number to wait for is one xAI hasn't published.

## Key takeaways

- Grok 4.5 entered private beta at SpaceX and Tesla on 28 June 2026 — its first confirmed deployment in Musk's companies.
- It runs on xAI's V9 architecture at 1.5 trillion parameters, about three times the smaller Grok serving X today.
- Musk says it rivals Claude Opus, but xAI has published no benchmarks and no system card.
- No independent benchmark has scored Grok 4.5, and there's no public access.

## FAQ

### Is Grok 4.5 public?
No. As of 28 June 2026 it's a private, invite-only beta limited to SpaceX and Tesla engineers — no public API, app or developer access.

### Does it beat Claude Opus?
Unverified. Musk said early evaluations put it close to or above Claude Opus, but xAI has shown no benchmarks or system card and no independent test has run.

### How big is Grok 4.5?
It runs on xAI's V9 architecture at 1.5 trillion parameters, about three times the v8-small model currently serving Grok on X and in Tesla.

### What's next from xAI?
xAI says it plans to release a new foundation model each month through end-2026, with V9 variants feeding a larger Grok 5 on the Colossus 2 supercluster.

## Sources

- [Grok 4.5 Enters Private Beta at SpaceX and Tesla: No Public Access, No Independent Benchmark](https://www.techtimes.com/articles/319314/20260629/grok-45-enters-private-beta-spacex-tesla-no-public-access-no-independent-benchmark.htm) — Tech Times, 2026-06-29
- [Grok 4.5 enters private beta at SpaceX and Tesla with 1.5 trillion parameters](https://cryptobriefing.com/grok-4-5-private-beta-spacex-tesla/) — Crypto Briefing, 2026-06-28
- [Musk Says Grok 4.5 Enters Private Beta at SpaceX, Tesla](https://letsdatascience.com/news/musk-says-grok-45-enters-private-beta-at-spacex-tesla-1840769e) — Let's Data Science, 2026-06-28