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GPT-4o (Omni) vs Grok 4.20 Beta

Compare GPT-4o (Omni) by OpenAI against Grok 4.20 Beta by xAI, context windows of 128K vs 2.0M, tested across 51 shared challenges. Updated March 2026.

Which is better, GPT-4o (Omni) or Grok 4.20 Beta?

GPT-4o (Omni) and Grok 4.20 Beta are both competitive models. GPT-4o (Omni) costs $2.5/M input tokens vs $2/M for Grok 4.20 Beta. Context windows: 128K vs 2000K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4o (Omni) and Grok 4.20 Beta

GPT-4o (Omni) is made by openai while Grok 4.20 Beta is from xai. GPT-4o (Omni) has a 128K token context window compared to Grok 4.20 Beta's 2000K. On pricing, GPT-4o (Omni) costs $2.5/M input tokens vs $2/M for Grok 4.20 Beta.

Our Verdict
Grok 4.20 Beta
Grok 4.20 Beta
GPT-4o (Omni)
GPT-4o (Omni)Runner-up

No community votes yet. On paper, Grok 4.20 Beta has the edge — newer, bigger context window.

Too close to call
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