Claude 3 Opus vs Gemini 3.1 Pro Preview

Compare Claude 3 Opus by Anthropic against Gemini 3.1 Pro Preview by Google AI, context windows of 200K vs 1.0M, tested across 12 shared challenges. Updated April 2026.

Which is better, Claude 3 Opus or Gemini 3.1 Pro Preview?

Claude 3 Opus and Gemini 3.1 Pro Preview are both competitive models. Claude 3 Opus 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 3 Opus and Gemini 3.1 Pro Preview

Claude 3 Opus is made by anthropic while Gemini 3.1 Pro Preview is from google. Claude 3 Opus has a 200K token context window compared to Gemini 3.1 Pro Preview's 1049K. On pricing, Claude 3 Opus 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 3 Opus
Claude 3 OpusRunner-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
95%

Gemini 3.1 Pro Preview uses 487.7x more bold

Claude 3 Opus
Gemini 3.1 Pro Preview
54%Vocabulary54%
14wSentence Length18w
0.48Hedging0.29
0.0Bold4.9
3.0Lists3.3
0.00Emoji0.00
0.00Headings0.72
0.06Transitions0.14
Based on 3 + 23 text responses
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Claude 3 OpusGemini 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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