GPT-5.1-Codex vs Grok 4.20 Beta
Compare GPT-5.1-Codex by OpenAI against Grok 4.20 Beta by xAI, context windows of 400K vs 2.0M, tested across 52 shared challenges. Updated April 2026.
Which is better, GPT-5.1-Codex or Grok 4.20 Beta?
GPT-5.1-Codex and Grok 4.20 Beta are both competitive models. GPT-5.1-Codex 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-5.1-Codex and Grok 4.20 Beta
GPT-5.1-Codex is made by openai while Grok 4.20 Beta is from xai. GPT-5.1-Codex has a 400K token context window compared to Grok 4.20 Beta's 2000K. On pricing, GPT-5.1-Codex costs $1.25/M input tokens vs $2/M for Grok 4.20 Beta.
No community votes yet. On paper, Grok 4.20 Beta has the edge — newer, bigger context window.
Style Comparison
GPT-5.1-Codex uses 2.8x more transitions
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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
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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.
