Gemini 3 Flash Preview vs xAI: Grok 4 Fast (free)
Compare Gemini 3 Flash Preview by Google AI against xAI: Grok 4 Fast (free) by xAI, context windows of 1.0M vs 2.0M, tested across 35 shared challenges. Updated April 2026.
Which is better, Gemini 3 Flash Preview or xAI: Grok 4 Fast (free)?
Gemini 3 Flash Preview and xAI: Grok 4 Fast (free) are both competitive models. Gemini 3 Flash Preview costs $0.5/M input tokens vs $0/M for xAI: Grok 4 Fast (free). Context windows: 1049K vs 2000K tokens. Compare their real outputs side by side below.
Key Differences Between Gemini 3 Flash Preview and xAI: Grok 4 Fast (free)
Gemini 3 Flash Preview is made by google while xAI: Grok 4 Fast (free) is from xai. Gemini 3 Flash Preview has a 1049K token context window compared to xAI: Grok 4 Fast (free)'s 2000K. On pricing, Gemini 3 Flash Preview costs $0.5/M input tokens vs $0/M for xAI: Grok 4 Fast (free).
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
Gemini 3 Flash Preview uses 5.1x more bold
vs
Ask them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
