Claude 3 Opus vs GPT-5 Mini

Compare Claude 3 Opus by Anthropic against GPT-5 Mini by OpenAI, tested across 12 shared challenges. Updated April 2026.

Which is better, Claude 3 Opus or GPT-5 Mini?

Claude 3 Opus and GPT-5 Mini are both competitive models. Claude 3 Opus costs $15/M input tokens vs $0.25/M for GPT-5 Mini. Compare their real outputs side by side below.

Key Differences Between Claude 3 Opus and GPT-5 Mini

Claude 3 Opus is made by anthropic while GPT-5 Mini is from openai. On pricing, Claude 3 Opus costs $15/M input tokens vs $0.25/M for GPT-5 Mini.

Our Verdict
Claude 3 Opus
Claude 3 Opus
GPT-5 Mini
GPT-5 Mini

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

GPT-5 Mini is 38x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
85%

Claude 3 Opus uses 2.9x more hedging

Claude 3 Opus
GPT-5 Mini
54%Vocabulary62%
14wSentence Length21w
0.48Hedging0.16
0.0Bold0.0
3.0Lists3.4
0.00Emoji0.00
0.00Headings0.00
0.06Transitions0.05
Based on 3 + 15 text responses
vs

Ask them anything yourself

Claude 3 OpusGPT-5 Mini

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
FAQ

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