Claude 3 Sonnet vs DeepSeek R1 0528

Compare Claude 3 Sonnet by Anthropic against DeepSeek R1 0528 by DeepSeek, tested across 13 shared challenges. Updated April 2026.

Which is better, Claude 3 Sonnet or DeepSeek R1 0528?

Claude 3 Sonnet and DeepSeek R1 0528 are both competitive models. Claude 3 Sonnet costs $3/M input tokens vs $0/M for DeepSeek R1 0528. Compare their real outputs side by side below.

Key Differences Between Claude 3 Sonnet and DeepSeek R1 0528

Claude 3 Sonnet is made by anthropic while DeepSeek R1 0528 is from deepseek. On pricing, Claude 3 Sonnet costs $3/M input tokens vs $0/M for DeepSeek R1 0528.

Our Verdict
DeepSeek R1 0528
DeepSeek R1 0528
Claude 3 Sonnet
Claude 3 SonnetRunner-up

No community votes yet. On paper, DeepSeek R1 0528 has the edge — bigger model tier, newer, bigger context window.

Too close to call
Writing DNA

Style Comparison

Similarity
89%

DeepSeek R1 0528 uses 683.2x more bold

Claude 3 Sonnet
DeepSeek R1 0528
48%Vocabulary64%
14wSentence Length10w
0.32Hedging0.30
0.0Bold6.8
3.6Lists4.9
0.00Emoji0.00
0.00Headings0.40
0.38Transitions0.00
Based on 4 + 4 text responses
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Claude 3 SonnetDeepSeek R1 0528

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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