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Claude Opus 4.1 vs Gemini 3.1 Pro Preview

Compare Claude Opus 4.1 by Anthropic against Gemini 3.1 Pro Preview by Google AI, context windows of 200K vs 1.0M, tested across 27 shared challenges. Updated April 2026.

Which is better, Claude Opus 4.1 or Gemini 3.1 Pro Preview?

Claude Opus 4.1 and Gemini 3.1 Pro Preview are both competitive models. Claude Opus 4.1 costs $15/M input tokens vs $2/M for Gemini 3.1 Pro Preview. Context windows: 200K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.1 and Gemini 3.1 Pro Preview

Claude Opus 4.1 is made by anthropic while Gemini 3.1 Pro Preview is from google. Claude Opus 4.1 has a 200K token context window compared to Gemini 3.1 Pro Preview's 1049K. On pricing, Claude Opus 4.1 costs $15/M input tokens vs $2/M for Gemini 3.1 Pro Preview.

Our Verdict
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview
Claude Opus 4.1
Claude Opus 4.1Runner-up

No community votes yet. On paper, Gemini 3.1 Pro Preview has the edge — newer, bigger context window.

Gemini 3.1 Pro Preview is 6.3x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
96%

Claude Opus 4.1 uses 38.4x more emoji

Claude Opus 4.1
Gemini 3.1 Pro Preview
61%Vocabulary54%
87wSentence Length18w
0.54Hedging0.29
5.1Bold4.9
6.7Lists3.3
0.38Emoji0.00
1.68Headings0.72
0.13Transitions0.14
Based on 17 + 23 text responses
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Claude Opus 4.1Gemini 3.1 Pro 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
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