Grok 3 Mini Beta vs xAI: Grok 4 Fast (free)
Compare Grok 3 Mini Beta and xAI: Grok 4 Fast (free), both from xAI, context windows of 131K vs 2.0M, tested across 8 shared challenges. Updated April 2026.
Which is better, Grok 3 Mini Beta or xAI: Grok 4 Fast (free)?
Grok 3 Mini Beta and xAI: Grok 4 Fast (free) are both competitive models. Grok 3 Mini Beta costs $0.4/M input tokens vs $0/M for xAI: Grok 4 Fast (free). Context windows: 131K vs 2000K tokens. Compare their real outputs side by side below.
Key Differences Between Grok 3 Mini Beta and xAI: Grok 4 Fast (free)
Grok 3 Mini Beta is made by xai while xAI: Grok 4 Fast (free) is from xai. Grok 3 Mini Beta has a 131K token context window compared to xAI: Grok 4 Fast (free)'s 2000K. On pricing, Grok 3 Mini Beta costs $0.4/M input tokens vs $0/M for xAI: Grok 4 Fast (free).
Our Verdict
xAI: Grok 4 Fast (free)
Grok 3 Mini BetaRunner-up
No community votes yet. On paper, xAI: Grok 4 Fast (free) has the edge — bigger model tier, newer, bigger context window.
Slight edge
vs
Ask them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
Free preview13 of 58 slides
FAQ