Model comparison
Grok 3 vs Grok 4 Fast
Price history, scores and specs for both models, line by line. Every value shows where it came from and when we last confirmed it.
xAI
Grok 3
Grok model for agentic tool use, reasoning, coding, and live assistance.
xAI
Grok 4 Fast
Fast Grok model for responsive chat, reasoning, and tool-assisted work.
Not checked yet
Neither model has a value we have confirmed from a source, so there is nothing to line up yet. Open each model for what its listing says.
How this works
One link, either order
This link stays the same whichever order you name the two models in, so you can share it as it is. A line appears only when at least one model has a value we confirmed from a source; values we have not confirmed are left out, never guessed. To add a third record of any type, use the open comparison. Read how we check facts.