Claude 3 Opus vs GPT-4

Compare Claude 3 Opus by Anthropic against GPT-4 by OpenAI, context windows of 200K vs 8K, tested across 8 shared challenges. Updated April 2026.

Which is better, Claude 3 Opus or GPT-4?

Claude 3 Opus and GPT-4 are both competitive models. Claude 3 Opus costs $15/M input tokens vs $30/M for GPT-4. Context windows: 200K vs 8K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3 Opus and GPT-4

Claude 3 Opus is made by anthropic while GPT-4 is from openai. Claude 3 Opus has a 200K token context window compared to GPT-4's 8K. On pricing, Claude 3 Opus costs $15/M input tokens vs $30/M for GPT-4.

Our Verdict
Claude 3 Opus
Claude 3 Opus
GPT-4
GPT-4Runner-up

No community votes yet. On paper, Claude 3 Opus has the edge — newer, bigger context window.

Too close to call
Writing DNA

Style Comparison

Similarity
100%

GPT-4 uses 82.3x more bold

Claude 3 Opus
GPT-4
54%Vocabulary59%
14wSentence Length18w
0.48Hedging1.10
0.0Bold0.8
3.0Lists2.5
0.00Emoji0.00
0.00Headings0.00
0.06Transitions0.45
Based on 3 + 15 text responses
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Claude 3 OpusGPT-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
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