GPT-5 Codex
Nothing here. The model returned empty. We stared at it for a while.
GPT-5 Codex vs Inception: Mercury
Compare GPT-5 Codex by OpenAI against Inception: Mercury by Inception, in 7 community votes, gpt-5 codex wins 100% of head-to-head duels, tested across 47 shared challenges. Updated April 2026.
Which is better, GPT-5 Codex or Inception: Mercury?
GPT-5 Codex is the better choice overall, winning 100% of 7 blind community votes on Rival. Compare their real outputs side by side below.
Key Differences Between GPT-5 Codex and Inception: Mercury
GPT-5 Codex is made by openai while Inception: Mercury is from inception. In community voting, In 7 community votes, GPT-5 Codex wins 100% of head-to-head duels.
In 7 community votes, GPT-5 Codex wins 100% of head-to-head duels. GPT-5 Codex leads in Image Generation, Web Design. Based on blind community voting from the Rival open dataset of 7+ human preference judgments for this pair.
Image Generation: GPT-5 Codex wins 100% of votes
Web Design: GPT-5 Codex wins 100% of votes
Our Verdict
GPT-5 CodexWinner
Inception: MercuryRunner-up
Pick GPT-5 Codex. In 7 blind votes, GPT-5 Codex wins 100% of the time. That's not luck.
GPT-5 Codex particularly excels in Image Generation, Web Design.
Clear winner
Writing DNA
Style Comparison
Similarity
93%
GPT-5 Codex uses 3.4x more emoji
GPT-5 Codex
Inception: Mercury
64%Vocabulary55%
17wSentence Length40w
0.38Hedging0.39
2.3Bold4.9
3.5Lists3.8
0.15Emoji0.04
0.49Headings1.04
0.05Transitions0.03
Based on 13 + 17 text responses
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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
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