Claude 3 Sonnet vs GPT-5

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

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

Claude 3 Sonnet and GPT-5 are both competitive models. Claude 3 Sonnet costs $3/M input tokens vs $1.25/M for GPT-5. Compare their real outputs side by side below.

Key Differences Between Claude 3 Sonnet and GPT-5

Claude 3 Sonnet is made by anthropic while GPT-5 is from openai. On pricing, Claude 3 Sonnet costs $3/M input tokens vs $1.25/M for GPT-5.

Our Verdict
GPT-5
GPT-5
Claude 3 Sonnet
Claude 3 SonnetRunner-up

No community votes yet. On paper, GPT-5 has the edge — bigger model tier, newer, bigger context window.

Too close to call
Writing DNA

Style Comparison

Similarity
99%

GPT-5 uses 18.9x more bold

Claude 3 Sonnet
GPT-5
48%Vocabulary65%
14wSentence Length13w
0.32Hedging0.20
0.0Bold0.2
3.6Lists4.6
0.00Emoji0.00
0.00Headings0.16
0.38Transitions0.03
Based on 4 + 16 text responses
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Claude 3 SonnetGPT-5

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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