xAI has officially released Grok 4.3, the latest iteration of its AI model, with Elon Musk announcing availability on Vercel today. The rollout follows a beta period that began April 17 for SuperGrok Heavy subscribers, and the model is now broadly accessible through xAI's API, Vercel AI Gateway, and OpenRouter.
The public launch marks a faster cadence for xAI compared to earlier model releases. Grok 4.3 first appeared in limited beta roughly two weeks ago, giving SuperGrok Heavy subscribers early access before today's wider API release. Making it available through Vercel AI Gateway and OpenRouter signals xAI is prioritizing developer reach — both platforms are widely used by teams building AI-powered applications.
xAI hasn't published a detailed changelog for 4.3 at the time of writing, so a direct capability comparison to Grok 4 remains limited to early user reports. What's clear is that the model is production-ready and accessible now through standard API integrations, lowering the barrier for developers who want to experiment with it outside of the native Grok interface.
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- @elonmusk on X (2026-05-01T19:31:25.000Z) — Direct source
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