ChatGPT-4o (March 2025)
Nothing here. The model returned empty. We stared at it for a while.
ChatGPT-4o (March 2025) vs xAI: Grok 4
Compare ChatGPT-4o (March 2025) by OpenAI against xAI: Grok 4 by xAI, context windows of 128K vs 256K, tested across 22 shared challenges. Updated April 2026.
Which is better, ChatGPT-4o (March 2025) or xAI: Grok 4?
ChatGPT-4o (March 2025) and xAI: Grok 4 are both competitive models. ChatGPT-4o (March 2025) costs $5/M input tokens vs $3/M for xAI: Grok 4. Context windows: 128K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between ChatGPT-4o (March 2025) and xAI: Grok 4
ChatGPT-4o (March 2025) is made by openai while xAI: Grok 4 is from xai. ChatGPT-4o (March 2025) has a 128K token context window compared to xAI: Grok 4's 256K. On pricing, ChatGPT-4o (March 2025) costs $5/M input tokens vs $3/M for xAI: Grok 4.
Our Verdict
ChatGPT-4o (March 2025)
xAI: Grok 4
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
Writing DNA
Style Comparison
Similarity
97%
ChatGPT-4o (March 2025) uses 13.5x more emoji
ChatGPT-4o (March 2025)
xAI: Grok 4
55%Vocabulary53%
24wSentence Length18w
0.52Hedging0.67
3.3Bold2.7
6.0Lists2.7
0.94Emoji0.07
0.63Headings0.86
0.05Transitions0.04
Based on 15 + 21 text responses
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