Grok 4.3 lands with steep price cuts, Imagine agent mode and one-minute voice cloning

xAI shipped Grok 4.3 with ~40% lower input pricing and ~60% lower output pricing than Grok 4.20, scoring 53 on Artificial Analysis Intelligence Index — above Muse Spark and Sonnet 4.6. Alongside it: Grok Imagine Agent Mode for creative workflows and Custom Voices, which clones a usable voice from one minute of speech.