Grok 4.3 was released by xAI on April 17, 2026, as a flagship model in the Grok line.
xAI's update to Grok 4.20: it can now hold a whole book of text at once, watch video, and costs 40% less for the text you send in — with a few points higher on a broad skills test.
Compared with Grok 4.20 · the model it replaces
Can hold a whole book in mind at once
Context window — how much text it can read in one go
1M tokens
✦ new in Grok 4.3
Can now watch video, not just read text and see images
Video input — understanding moving footage directly
native
✦ new in Grok 4.3
Costs 40% less for the text you send it
Input price — what developers pay for the text they send in
40% cheaper
▲ vs Grok 4.20 · input only
Every Monday, only when something shipped: the AI models that came out, what each one changed, and which lines are due next.
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Grok 4.7 is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Latest: Grok 4.7 · Sep 21, 2026
“Grok 4.8, which is a 2.5T model trained with our new C++ software stack, will finish training this week and start RL” — xAI, Sep 14, 2026 · Elon Musk on X
What changed in Grok 4.7 →Newest first. See the full line with every card →