Claude Sonnet 4 vs Gemini 2.5 Flash Preview

Compare Claude Sonnet 4 by Anthropic against Gemini 2.5 Flash Preview by Google AI, in 6 community votes, claude sonnet 4 and gemini 2.5 flash preview are closely matched, context windows of 200K vs 1.0M, tested across 16 shared challenges. Updated April 2026.

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

Claude Sonnet 4 and Gemini 2.5 Flash Preview are closely matched based on 6 community votes. Claude Sonnet 4 costs $3/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview. Context windows: 200K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Sonnet 4 and Gemini 2.5 Flash Preview

Claude Sonnet 4 is made by anthropic while Gemini 2.5 Flash Preview is from google. Claude Sonnet 4 has a 200K token context window compared to Gemini 2.5 Flash Preview's 1049K. On pricing, Claude Sonnet 4 costs $3/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview. In community voting, In 6 community votes, Claude Sonnet 4 and Gemini 2.5 Flash Preview are closely matched.

In 6 community votes, Claude Sonnet 4 and Gemini 2.5 Flash Preview are closely matched. Claude Sonnet 4 leads in Image Generation, while Gemini 2.5 Flash Preview leads in Web Design. Based on blind community voting from the Rival open dataset of 6+ human preference judgments for this pair.

Image Generation: Claude Sonnet 4 wins 100% of votes
Web Design: Gemini 2.5 Flash Preview wins 100% of votes
Our Verdict
Claude Sonnet 4
Claude Sonnet 4
Gemini 2.5 Flash Preview
Gemini 2.5 Flash Preview

Too close to call. Pick based on your use case.

Pick Claude Sonnet 4 for Image Generation. Pick Gemini 2.5 Flash Preview for Web Design. Gemini 2.5 Flash Preview is 25x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
66%

Claude Sonnet 4 uses 87.9x more emoji

Claude Sonnet 4
Gemini 2.5 Flash Preview
62%Vocabulary51%
111wSentence Length15w
0.40Hedging0.70
5.0Bold4.1
9.3Lists3.3
0.88Emoji0.00
2.16Headings0.09
0.33Transitions0.24
Based on 17 + 12 text responses
vs

Ask them anything yourself

Claude Sonnet 4Gemini 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
FAQ

Common questions