Claude 3 Sonnet vs Gemini 2.5 Flash Preview

Compare Claude 3 Sonnet by Anthropic against Gemini 2.5 Flash Preview by Google AI, tested across 9 shared challenges. Updated April 2026.

Which is better, Claude 3 Sonnet or Gemini 2.5 Flash Preview?

Claude 3 Sonnet and Gemini 2.5 Flash Preview are both competitive models. Claude 3 Sonnet costs $3/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview. Compare their real outputs side by side below.

Key Differences Between Claude 3 Sonnet and Gemini 2.5 Flash Preview

Claude 3 Sonnet is made by anthropic while Gemini 2.5 Flash Preview is from google. On pricing, Claude 3 Sonnet costs $3/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview.

Our Verdict
Claude 3 Sonnet
Claude 3 Sonnet
Gemini 2.5 Flash Preview
Gemini 2.5 Flash Preview

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

Gemini 2.5 Flash Preview is 25x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
84%

Gemini 2.5 Flash Preview uses 407.5x more bold

Claude 3 Sonnet
Gemini 2.5 Flash Preview
48%Vocabulary51%
14wSentence Length15w
0.32Hedging0.70
0.0Bold4.1
3.6Lists3.3
0.00Emoji0.00
0.00Headings0.09
0.38Transitions0.24
Based on 4 + 12 text responses
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Claude 3 SonnetGemini 2.5 Flash Preview

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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