How long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Newest first — what each version changed versus the one before, in xAI's own numbers.
Added configurable reasoning effort (low, medium, high) with a 500K-token context window, priced at $2 per million input tokens and $6 per million output tokens.
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
xAI's new flagship Grok: the first version that retrains itself every week from real-world feedback, and it makes up fewer answers than any model tested so far.
Compared with Grok 4.1 · the version it replaces
Retrains itself every week from real-world feedback
Update cadence — how often the model is refreshed
weekly
✦ new in Grok 4.20 · first Grok to do this
Makes up fewer answers than any model tested so far
AA Omniscience — how often the model avoids inventing facts
78%
▲ best of any model tested · no earlier score to compare
Lands among the top-scoring models in public head-to-head votes
Arena Elo — early ranking from people comparing answers blind
~1505-1535
▲ early measurement · nothing earlier to compare
One email a week: what AI models shipped, the actual differences vs the previous version, and what's coming next. No filler.