DeepSeek V3.1 vs xAI: Grok 4 Fast (free)
Compare DeepSeek V3.1 by DeepSeek against xAI: Grok 4 Fast (free) by xAI, in 4 community votes, xai: grok 4 fast (free) wins 100% of head-to-head duels, context windows of 164K vs 2.0M, tested across 35 shared challenges. Updated April 2026.
Which is better, DeepSeek V3.1 or xAI: Grok 4 Fast (free)?
xAI: Grok 4 Fast (free) is the better choice overall, winning 100% of 4 blind community votes on Rival. DeepSeek V3.1 costs $0.2/M input tokens vs $0/M for xAI: Grok 4 Fast (free). Context windows: 164K vs 2000K tokens. Compare their real outputs side by side below.
Key Differences Between DeepSeek V3.1 and xAI: Grok 4 Fast (free)
DeepSeek V3.1 is made by deepseek while xAI: Grok 4 Fast (free) is from xai. DeepSeek V3.1 has a 164K token context window compared to xAI: Grok 4 Fast (free)'s 2000K. On pricing, DeepSeek V3.1 costs $0.2/M input tokens vs $0/M for xAI: Grok 4 Fast (free). In community voting, In 4 community votes, xAI: Grok 4 Fast (free) wins 100% of head-to-head duels.
In 4 community votes, xAI: Grok 4 Fast (free) wins 100% of head-to-head duels. xAI: Grok 4 Fast (free) leads in Image Generation. Based on blind community voting from the Rival open dataset of 4+ human preference judgments for this pair.
Pick xAI: Grok 4 Fast (free). In 4 blind votes, xAI: Grok 4 Fast (free) wins 100% of the time. That's not luck.
xAI: Grok 4 Fast (free) particularly excels in Image Generation.
Style Comparison
DeepSeek V3.1 uses 2.4x more emoji
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.
