GPT-4o (Omni) vs Claude 3 Opus

Compare GPT-4o (Omni) by OpenAI against Claude 3 Opus by Anthropic, context windows of 128K vs 200K, tested across 11 shared challenges. Updated April 2026.

Which is better, GPT-4o (Omni) or Claude 3 Opus?

GPT-4o (Omni) and Claude 3 Opus are both competitive models. GPT-4o (Omni) costs $2.5/M input tokens vs $15/M for Claude 3 Opus. Context windows: 128K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4o (Omni) and Claude 3 Opus

GPT-4o (Omni) is made by openai while Claude 3 Opus is from anthropic. GPT-4o (Omni) has a 128K token context window compared to Claude 3 Opus's 200K. On pricing, GPT-4o (Omni) costs $2.5/M input tokens vs $15/M for Claude 3 Opus.

Our Verdict
GPT-4o (Omni)
GPT-4o (Omni)
Claude 3 Opus
Claude 3 Opus

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

GPT-4o (Omni) is 7.5x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
86%

GPT-4o (Omni) uses 734.5x more bold

GPT-4o (Omni)
Claude 3 Opus
54%Vocabulary54%
18wSentence Length14w
0.72Hedging0.48
7.3Bold0.0
5.6Lists3.0
0.03Emoji0.00
1.40Headings0.00
0.26Transitions0.06
Based on 24 + 3 text responses
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GPT-4o (Omni)Claude 3 Opus
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