Claude 3 Sonnet vs GPT-5 Mini

Compare Claude 3 Sonnet by Anthropic against GPT-5 Mini by OpenAI, tested across 13 shared challenges. Updated April 2026.

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

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

Key Differences Between Claude 3 Sonnet and GPT-5 Mini

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

Our Verdict
Claude 3 Sonnet
Claude 3 Sonnet
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 7.5x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
97%

Claude 3 Sonnet uses 8.3x more transitions

Claude 3 Sonnet
GPT-5 Mini
48%Vocabulary62%
14wSentence Length21w
0.32Hedging0.16
0.0Bold0.0
3.6Lists3.4
0.00Emoji0.00
0.00Headings0.00
0.38Transitions0.05
Based on 4 + 15 text responses
vs

Ask them anything yourself

Claude 3 SonnetGPT-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
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