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Gemini 2.5 Pro Preview 06-05 vs o3 Mini

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

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

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

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

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

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

Gemini 2.5 Pro Preview 06-05
o3 Mini
51%Vocabulary65%
15wSentence Length17w
0.31Hedging0.74
4.8Bold3.9
4.1Lists1.7
0.00Emoji0.00
0.98Headings0.47
0.05Transitions0.38
Based on 20 + 12 text responses
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Gemini 2.5 Pro Preview 06-05o3 Mini

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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