GPT-5 vs Grok 4.20 Beta
Compare GPT-5 by OpenAI against Grok 4.20 Beta by xAI, context windows of 400K vs 2.0M, tested across 51 shared challenges. Updated June 2026.
Which is better, GPT-5 or Grok 4.20 Beta?
GPT-5 and Grok 4.20 Beta are both competitive models. GPT-5 costs $1.25/M input tokens vs $2/M for Grok 4.20 Beta. Context windows: 400K vs 2000K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5 and Grok 4.20 Beta
GPT-5 is made by openai while Grok 4.20 Beta is from xai. GPT-5 has a 400K token context window compared to Grok 4.20 Beta's 2000K. On pricing, GPT-5 costs $1.25/M input tokens vs $2/M for Grok 4.20 Beta.
API pricing
Per 1M tokens
GPT-5
Input
$1.25
1.6× cheaper
Output
$10.00
Grok 4.20 Beta
Input
$2.00
Output
$6.00
1.7× cheaper
GPT-5 wins input (1.6× cheaper)·Grok 4.20 Beta wins output (1.7× cheaper)
Our Verdict
Grok 4.20 Beta
GPT-5Runner-up
No community votes yet. On paper, Grok 4.20 Beta has the edge — newer, bigger context window.
Too close to call
Writing DNA
Style Comparison
Similarity
48%
Grok 4.20 Beta uses 22.1x more bold
GPT-5
Grok 4.20 Beta
65%Vocabulary57%
13wSentence Length20w
0.20Hedging0.35
0.2Bold4.2
4.6Lists3.7
0.00Emoji0.00
0.16Headings0.62
0.03Transitions0.14
Based on 16 + 23 text responses
FAQ
