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o1 vs Gemini 2.5 Pro Preview 06-05

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

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

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

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

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

o1
Gemini 2.5 Pro Preview 06-05
64%Vocabulary51%
16wSentence Length15w
0.76Hedging0.31
5.0Bold4.8
2.6Lists4.1
0.00Emoji0.00
0.44Headings0.98
0.40Transitions0.05
Based on 13 + 20 text responses
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o1Gemini 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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