GPT-5
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GPT-5 vs o1
Compare GPT-5 and o1, both from OpenAI, in 12 community votes, gpt-5 wins 56% of head-to-head duels, context windows of 400K vs 128K, tested across 47 shared challenges. Updated April 2026.
Which is better, GPT-5 or o1?
GPT-5 is the better choice overall, winning 56% of 12 blind community votes on Rival. GPT-5 costs $1.25/M input tokens vs $15/M for o1. Context windows: 400K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5 and o1
GPT-5 is made by openai while o1 is from openai. GPT-5 has a 400K token context window compared to o1's 128K. On pricing, GPT-5 costs $1.25/M input tokens vs $15/M for o1. In community voting, In 12 community votes, GPT-5 wins 56% of head-to-head duels.
In 12 community votes, GPT-5 wins 56% of head-to-head duels. GPT-5 leads in Reasoning. Based on blind community voting from the Rival open dataset of 12+ human preference judgments for this pair.
Reasoning: GPT-5 wins 60% of votes
Our Verdict
GPT-5Winner
o1Runner-up
GPT-5 has the edge overall. In 12 blind votes, GPT-5 wins 56% of the time.
GPT-5 particularly excels in Reasoning. GPT-5 is 6.0x cheaper per token — worth considering if cost matters.
Slight edge
Writing DNA
Style Comparison
Similarity
100%
o1 uses 26.7x more bold
GPT-5
o1
65%Vocabulary64%
13wSentence Length16w
0.20Hedging0.76
0.2Bold5.0
4.6Lists2.6
0.00Emoji0.00
0.16Headings0.44
0.03Transitions0.40
Based on 16 + 13 text responses
vsAsk them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
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