DeepSeek R1 vs xAI: Grok 4 Fast (free)
Compare DeepSeek R1 by DeepSeek against xAI: Grok 4 Fast (free) by xAI, context windows of 128K vs 2.0M, tested across 35 shared challenges. Updated April 2026.
Which is better, DeepSeek R1 or xAI: Grok 4 Fast (free)?
DeepSeek R1 and xAI: Grok 4 Fast (free) are both competitive models. DeepSeek R1 costs $0.55/M input tokens vs $0/M for xAI: Grok 4 Fast (free). Context windows: 128K vs 2000K tokens. Compare their real outputs side by side below.
Key Differences Between DeepSeek R1 and xAI: Grok 4 Fast (free)
DeepSeek R1 is made by deepseek while xAI: Grok 4 Fast (free) is from xai. DeepSeek R1 has a 128K token context window compared to xAI: Grok 4 Fast (free)'s 2000K. On pricing, DeepSeek R1 costs $0.55/M input tokens vs $0/M for xAI: Grok 4 Fast (free).
No community votes yet. On paper, xAI: Grok 4 Fast (free) has the edge — newer, bigger context window.
Style Comparison
DeepSeek R1 uses 4.3x more emoji
vs
Ask them anything yourself
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178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
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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.
