GPT-5.2 vs xAI: Grok 4

Compare GPT-5.2 by OpenAI against xAI: Grok 4 by xAI, context windows of 400K vs 256K, tested across 38 shared challenges. Updated April 2026.

Which is better, GPT-5.2 or xAI: Grok 4?

GPT-5.2 and xAI: Grok 4 are both competitive models. GPT-5.2 costs $1.75/M input tokens vs $3/M for xAI: Grok 4. Context windows: 400K vs 256K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-5.2 and xAI: Grok 4

GPT-5.2 is made by openai while xAI: Grok 4 is from xai. GPT-5.2 has a 400K token context window compared to xAI: Grok 4's 256K. On pricing, GPT-5.2 costs $1.75/M input tokens vs $3/M for xAI: Grok 4.

Our Verdict
GPT-5.2
GPT-5.2
xAI: Grok 4
xAI: Grok 4Runner-up

No community votes yet. On paper, GPT-5.2 has the edge — bigger model tier, newer, bigger context window.

Slight edge
Writing DNA

Style Comparison

Similarity
99%

GPT-5.2 uses 7.0x more transitions

GPT-5.2
xAI: Grok 4
64%Vocabulary53%
16wSentence Length18w
0.34Hedging0.67
9.4Bold2.7
3.9Lists2.7
0.06Emoji0.07
0.89Headings0.86
0.31Transitions0.04
Based on 15 + 21 text responses
vs

Ask them anything yourself

GPT-5.2xAI: Grok 4

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
FAQ

Common questions