# Grok 4.5 enters private beta at SpaceX and Tesla with 1.5 trillion parameters > Source: > Published: 2026-06-28 10:55:20+00:00 # Grok 4.5 enters private beta at SpaceX and Tesla with 1.5 trillion parameters xAI's latest model, built on the V9 foundation and trained with Cursor data, is reportedly performing at or above Anthropic's Opus level Elon Musk’s xAI just dropped its biggest model yet into the hands of engineers at two of his other companies. Grok 4.5, a 1.5-trillion-parameter behemoth built on the V9 foundation model, entered private beta at SpaceX and Tesla on June 28, 2026. Early internal evaluations suggest the model’s performance is close to, or potentially exceeds, Anthropic’s Opus. That’s a bold claim for a model that hasn’t even left the building yet, but the decision to test it inside two of the world’s most engineering-intensive companies tells you something about xAI’s confidence level. ## What makes Grok 4.5 different The headline number is 1.5 trillion parameters. For context, that’s a 50% jump from Grok 4.4, which shipped with 1 trillion parameters in late May 2026. Grok 4.5 incorporates supplemental training data from Cursor, the AI-powered code editor that has become a favorite among developers. Training on Cursor data means the model has been exposed to vast amounts of real coding workflows, debugging patterns, and software architecture decisions. The model also benefits from ongoing reinforcement learning, along with updates to what xAI calls the Grok Build harness. ## Why SpaceX and Tesla are the testing ground There’s a strategic logic to deploying Grok 4.5 inside SpaceX and Tesla before anyone else gets to touch it. Both companies operate at the intersection of hardware engineering, software systems, and real-time decision-making. The private beta also gives xAI something its competitors struggle to replicate: access to proprietary operational data from world-class engineering organizations. Most AI companies test their models on public benchmarks and synthetic tasks. xAI gets to test on actual rocket trajectories and vehicle manufacturing workflows. ## The bigger picture for AI and investors xAI has laid out an aggressive roadmap for the remainder of 2026. The company anticipates releasing new models trained from scratch at SpaceX every month through year-end. Going from Grok 4.4 at 1 trillion parameters in late May to Grok 4.5 at 1.5 trillion parameters roughly a month later is the kind of scaling velocity that forces competitors to respond. It’s worth noting that no crypto tokens or digital assets are linked to this development. xAI appears firmly focused on AI advancement rather than tokenization. **Disclosure:** This article was edited by Editorial Team. For more information on how we create and review content, see our [Editorial Policy](https://cryptobriefing.com/editorial-policy/).