xAI launches Grok 4.5 beta internally at Tesla and SpaceX, plans monthly model releases

xAI has launched Grok 4.5 into private beta testing within SpaceX and Tesla, offering employees early access before a public rollout. The model is trained on xAI's 1.5T-parameter V9 foundation model and aims to improve coding and reasoning, with Elon Musk claiming its performance may match or exceed Anthropic's Opus. Musk also said SpaceX is redeploying top Starship and Starlink engineers to work on Grok, and xAI announced a roadmap to introduce new AI models every month throughout 2026.

The internal-dogfooding approach — testing inside Tesla and SpaceX first — gives xAI real-world coding and engineering workloads to harden the model before public release, while the monthly-cadence pledge is an explicit bid to out-iterate rivals amid the week's version-fatigue mood.

Competitively, xAI is positioning Grok 4.5 directly against Anthropic's Opus class, even as the rest of the field gates cyber-capable models behind government approval. Separately, xAI promoted state-of-the-art voice APIs 'from SpaceXAI' now available in the Vercel AI Gateway.

The reception was harsh in places: Yann LeCun's claim that 'xAI is a failure' drew 1,429 upvotes and 302 comments on r/singularity, sharply dividing opinion. Skeptics question whether monthly releases can sustain quality, and whether Musk's benchmark claims will survive independent testing — a recurring credibility issue for Grok launches. What to watch: when Grok 4.5 hits public availability and whether independent benchmarks back the Opus-parity claim.