ChatGPT-4o (March 2025) vs Inception: Mercury

Compare ChatGPT-4o (March 2025) by OpenAI against Inception: Mercury by Inception, context windows of 128K vs 32K, tested across 32 shared challenges. Updated April 2026.

Which is better, ChatGPT-4o (March 2025) or Inception: Mercury?

ChatGPT-4o (March 2025) and Inception: Mercury are both competitive models. ChatGPT-4o (March 2025) costs $5/M input tokens vs $10/M for Inception: Mercury. Context windows: 128K vs 32K tokens. Compare their real outputs side by side below.

Key Differences Between ChatGPT-4o (March 2025) and Inception: Mercury

ChatGPT-4o (March 2025) is made by openai while Inception: Mercury is from inception. ChatGPT-4o (March 2025) has a 128K token context window compared to Inception: Mercury's 32K. On pricing, ChatGPT-4o (March 2025) costs $5/M input tokens vs $10/M for Inception: Mercury.

Our Verdict
ChatGPT-4o (March 2025)
ChatGPT-4o (March 2025)
Inception: Mercury
Inception: MercuryRunner-up

No community votes yet. On paper, ChatGPT-4o (March 2025) has the edge — bigger model tier, bigger context window, major provider backing.

Too close to call
Writing DNA

Style Comparison

Similarity
100%

ChatGPT-4o (March 2025) uses 22.2x more emoji

ChatGPT-4o (March 2025)
Inception: Mercury
55%Vocabulary55%
24wSentence Length40w
0.52Hedging0.39
3.3Bold4.9
6.0Lists3.8
0.94Emoji0.04
0.63Headings1.04
0.05Transitions0.03
Based on 15 + 17 text responses
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ChatGPT-4o (March 2025)Inception: Mercury

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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