GPT-4 vs Claude Opus 4

Compare GPT-4 by OpenAI against Claude Opus 4 by Anthropic, context windows of 8K vs 200K, tested across 20 shared challenges. Updated April 2026.

Which is better, GPT-4 or Claude Opus 4?

GPT-4 and Claude Opus 4 are both competitive models. GPT-4 costs $30/M input tokens vs $15/M for Claude Opus 4. Context windows: 8K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4 and Claude Opus 4

GPT-4 is made by openai while Claude Opus 4 is from anthropic. GPT-4 has a 8K token context window compared to Claude Opus 4's 200K. On pricing, GPT-4 costs $30/M input tokens vs $15/M for Claude Opus 4.

Our Verdict
Claude Opus 4
Claude Opus 4
GPT-4
GPT-4Runner-up

No community votes yet. On paper, Claude Opus 4 has the edge — newer, bigger context window.

Too close to call
Writing DNA

Style Comparison

Similarity
86%

Claude Opus 4 uses 11.2x more emoji

GPT-4
Claude Opus 4
59%Vocabulary64%
18wSentence Length62w
1.10Hedging0.52
0.8Bold4.4
2.5Lists9.1
0.00Emoji0.11
0.00Headings1.87
0.45Transitions0.27
Based on 15 + 16 text responses
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GPT-4Claude Opus 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
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