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Gemini 2.5 Pro Preview 06-05 vs o1

Compare Gemini 2.5 Pro Preview 06-05 by Google AI against o1 by OpenAI, context windows of 1.0M vs 128K, tested across 38 shared challenges. Updated April 2026.

Which is better, Gemini 2.5 Pro Preview 06-05 or o1?

Gemini 2.5 Pro Preview 06-05 and o1 are both competitive models. Gemini 2.5 Pro Preview 06-05 costs $1.25/M input tokens vs $15/M for o1. Context windows: 1049K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between Gemini 2.5 Pro Preview 06-05 and o1

Gemini 2.5 Pro Preview 06-05 is made by google while o1 is from openai. Gemini 2.5 Pro Preview 06-05 has a 1049K token context window compared to o1's 128K. On pricing, Gemini 2.5 Pro Preview 06-05 costs $1.25/M input tokens vs $15/M for o1.

Our Verdict
Gemini 2.5 Pro Preview 06-05
Gemini 2.5 Pro Preview 06-05
o1
o1Runner-up

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

Gemini 2.5 Pro Preview 06-05 is 6.0x cheaper per token — worth considering if cost matters.

Slight edge
Writing DNA

Style Comparison

Similarity
100%

o1 uses 7.8x more transitions

Gemini 2.5 Pro Preview 06-05
o1
51%Vocabulary64%
15wSentence Length16w
0.31Hedging0.76
4.8Bold5.0
4.1Lists2.6
0.00Emoji0.00
0.98Headings0.44
0.05Transitions0.40
Based on 20 + 13 text responses
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Gemini 2.5 Pro Preview 06-05o1

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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