Gemini 2.5 Flash Preview (thinking) vs Claude Sonnet 4

Compare Gemini 2.5 Flash Preview (thinking) by Google AI against Claude Sonnet 4 by Anthropic, in 3 community votes, claude sonnet 4 wins 67% of head-to-head duels, context windows of 1.0M vs 200K, tested across 14 shared challenges. Updated April 2026.

Which is better, Gemini 2.5 Flash Preview (thinking) or Claude Sonnet 4?

Claude Sonnet 4 is the better choice overall, winning 67% of 3 blind community votes on Rival. Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens vs $3/M for Claude Sonnet 4. Context windows: 1049K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between Gemini 2.5 Flash Preview (thinking) and Claude Sonnet 4

Gemini 2.5 Flash Preview (thinking) is made by google while Claude Sonnet 4 is from anthropic. Gemini 2.5 Flash Preview (thinking) has a 1049K token context window compared to Claude Sonnet 4's 200K. On pricing, Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens vs $3/M for Claude Sonnet 4. In community voting, In 3 community votes, Claude Sonnet 4 wins 67% of head-to-head duels.

In 3 community votes, Claude Sonnet 4 wins 67% of head-to-head duels. Claude Sonnet 4 leads in Image Generation. Based on blind community voting from the Rival open dataset of 3+ human preference judgments for this pair.

Image Generation: Claude Sonnet 4 wins 100% of votes
Our Verdict
Claude Sonnet 4
Claude Sonnet 4Winner
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)Runner-up

Pick Claude Sonnet 4. In 3 blind votes, Claude Sonnet 4 wins 67% of the time. That's not luck.

Claude Sonnet 4 particularly excels in Image Generation. Gemini 2.5 Flash Preview (thinking) is 4.3x cheaper per token — worth considering if cost matters.

Clear winner
Writing DNA

Style Comparison

Similarity
94%

Claude Sonnet 4 uses 87.9x more emoji

Gemini 2.5 Flash Preview (thinking)
Claude Sonnet 4
53%Vocabulary62%
14wSentence Length111w
0.38Hedging0.40
4.4Bold5.0
4.1Lists9.3
0.00Emoji0.88
0.00Headings2.16
0.24Transitions0.33
Based on 7 + 17 text responses
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Gemini 2.5 Flash Preview (thinking)Claude Sonnet 4

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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