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o3 Mini vs Gemini 2.5 Pro Preview 06-05

Compare o3 Mini by OpenAI against Gemini 2.5 Pro Preview 06-05 by Google AI, context windows of 64K vs 1.0M, tested across 38 shared challenges. Updated April 2026.

Which is better, o3 Mini or Gemini 2.5 Pro Preview 06-05?

o3 Mini and Gemini 2.5 Pro Preview 06-05 are both competitive models. o3 Mini costs $1.1/M input tokens vs $1.25/M for Gemini 2.5 Pro Preview 06-05. Context windows: 64K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between o3 Mini and Gemini 2.5 Pro Preview 06-05

o3 Mini is made by openai while Gemini 2.5 Pro Preview 06-05 is from google. o3 Mini has a 64K token context window compared to Gemini 2.5 Pro Preview 06-05's 1049K. On pricing, o3 Mini costs $1.1/M input tokens vs $1.25/M for Gemini 2.5 Pro Preview 06-05.

Our Verdict
Gemini 2.5 Pro Preview 06-05
Gemini 2.5 Pro Preview 06-05
o3 Mini
o3 MiniRunner-up

No community votes yet. On paper, Gemini 2.5 Pro Preview 06-05 has the edge — bigger model tier, newer, bigger context window.

Slight edge
Writing DNA

Style Comparison

Similarity
100%

o3 Mini uses 7.4x more transitions

o3 Mini
Gemini 2.5 Pro Preview 06-05
65%Vocabulary51%
17wSentence Length15w
0.74Hedging0.31
3.9Bold4.8
1.7Lists4.1
0.00Emoji0.00
0.47Headings0.98
0.38Transitions0.05
Based on 12 + 20 text responses
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o3 MiniGemini 2.5 Pro Preview 06-05

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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