o1
Nothing here. The model returned empty. We stared at it for a while.
o1 vs GPT-5
Compare o1 and GPT-5, both from OpenAI, in 12 community votes, gpt-5 wins 56% of head-to-head duels, context windows of 128K vs 400K, tested across 47 shared challenges. Updated April 2026.
Which is better, o1 or GPT-5?
GPT-5 is the better choice overall, winning 56% of 12 blind community votes on Rival. o1 costs $15/M input tokens vs $1.25/M for GPT-5. Context windows: 128K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between o1 and GPT-5
o1 is made by openai while GPT-5 is from openai. o1 has a 128K token context window compared to GPT-5's 400K. On pricing, o1 costs $15/M input tokens vs $1.25/M for GPT-5. 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
o1
GPT-5
64%Vocabulary65%
16wSentence Length13w
0.76Hedging0.20
5.0Bold0.2
2.6Lists4.6
0.00Emoji0.00
0.44Headings0.16
0.40Transitions0.03
Based on 13 + 16 text responses
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
Model Similarity Index
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
Devstral M / S
95.7%
Qwen3 Coder / Flash
95.6%
GPT-5.4 / Mini
93.3%
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
Free preview13 of 58 slides
FAQ