Grok 4.3 Review: What's New in xAI's Latest Model (April 2026)

TechSifted has no affiliate relationship with xAI. xAI didn't send a press release. No blog post, no fanfare. Grok 4.3 Beta just appeared in the model selector on grok.com on April 17 — flagged as "Early Access" — and early testers started posting about it while the broader AI internet was distracted by other things. That's a pattern xAI has leaned into. Quiet drop, let users find it, let Elon tweet about it later. So here's what's actually in this release, what's new, and who actually needs to