GPT-5.1 vs Gemini 2.5 Pro Preview 06-05

Compare GPT-5.1 by OpenAI against Gemini 2.5 Pro Preview 06-05 by Google AI, in 21 community votes, gemini 2.5 pro preview 06-05 wins 53% of head-to-head duels, context windows of 400K vs 1.0M, tested across 36 shared challenges. Updated April 2026.

Which is better, GPT-5.1 or Gemini 2.5 Pro Preview 06-05?

Gemini 2.5 Pro Preview 06-05 is the better choice overall, winning 53% of 21 blind community votes on Rival. GPT-5.1 costs $1.25/M input tokens vs $1.25/M for Gemini 2.5 Pro Preview 06-05. Context windows: 400K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-5.1 and Gemini 2.5 Pro Preview 06-05

GPT-5.1 is made by openai while Gemini 2.5 Pro Preview 06-05 is from google. GPT-5.1 has a 400K token context window compared to Gemini 2.5 Pro Preview 06-05's 1049K. On pricing, GPT-5.1 costs $1.25/M input tokens vs $1.25/M for Gemini 2.5 Pro Preview 06-05. In community voting, In 21 community votes, Gemini 2.5 Pro Preview 06-05 wins 53% of head-to-head duels.

In 21 community votes, Gemini 2.5 Pro Preview 06-05 wins 53% of head-to-head duels. GPT-5.1 leads in Web Design, Reasoning, while Gemini 2.5 Pro Preview 06-05 leads in Conversation, Image Generation. Based on blind community voting from the Rival open dataset of 21+ human preference judgments for this pair.

Web Design: GPT-5.1 wins 67% of votes
Conversation: Gemini 2.5 Pro Preview 06-05 wins 75% of votes
Image Generation: Gemini 2.5 Pro Preview 06-05 wins 67% of votes
Reasoning: GPT-5.1 wins 67% of votes
Our Verdict
Gemini 2.5 Pro Preview 06-05
Gemini 2.5 Pro Preview 06-05Winner
GPT-5.1
GPT-5.1Runner-up

Gemini 2.5 Pro Preview 06-05 has the edge overall. In 21 blind votes, Gemini 2.5 Pro Preview 06-05 wins 53% of the time.

Pick GPT-5.1 for Web Design, Reasoning. Pick Gemini 2.5 Pro Preview 06-05 for Conversation, Image Generation.

Slight edge
Writing DNA

Style Comparison

Similarity
93%

Gemini 2.5 Pro Preview 06-05 uses 1.9x more transitions

GPT-5.1
Gemini 2.5 Pro Preview 06-05
62%Vocabulary51%
19wSentence Length15w
0.29Hedging0.31
3.5Bold4.8
7.2Lists4.1
0.00Emoji0.00
0.61Headings0.98
0.03Transitions0.05
Based on 14 + 20 text responses
vs

Ask them anything yourself

GPT-5.1Gemini 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
Free preview13 of 58 slides
FAQ

Common questions