GPT-4.1 vs xAI: Grok 4 Fast (free)
Compare GPT-4.1 by OpenAI 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, GPT-4.1 or xAI: Grok 4 Fast (free)?
GPT-4.1 and xAI: Grok 4 Fast (free) are both competitive models. GPT-4.1 costs $2/M input tokens vs $0/M for xAI: Grok 4 Fast (free). Context windows: 1048K vs 2000K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4.1 and xAI: Grok 4 Fast (free)
GPT-4.1 is made by openai while xAI: Grok 4 Fast (free) is from xai. GPT-4.1 has a 1048K token context window compared to xAI: Grok 4 Fast (free)'s 2000K. On pricing, GPT-4.1 costs $2/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
GPT-4.1 uses 23.7x 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.
