GPT-5 Pro vs Inception: Mercury

Compare GPT-5 Pro by OpenAI against Inception: Mercury by Inception, context windows of 400K vs 32K, tested across 39 shared challenges. Updated April 2026.

Which is better, GPT-5 Pro or Inception: Mercury?

GPT-5 Pro and Inception: Mercury are both competitive models. GPT-5 Pro costs $15/M input tokens vs $10/M for Inception: Mercury. Context windows: 400K vs 32K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-5 Pro and Inception: Mercury

GPT-5 Pro is made by openai while Inception: Mercury is from inception. GPT-5 Pro has a 400K token context window compared to Inception: Mercury's 32K. On pricing, GPT-5 Pro costs $15/M input tokens vs $10/M for Inception: Mercury.

Our Verdict
GPT-5 Pro
GPT-5 Pro
Inception: Mercury
Inception: MercuryRunner-up

No community votes yet. On paper, GPT-5 Pro has the edge — bigger model tier, newer, bigger context window, major provider backing.

Inception: Mercury is 12x cheaper per token — worth considering if cost matters.

Slight edge
Writing DNA

Style Comparison

Similarity
91%

Inception: Mercury uses 489.0x more bold

GPT-5 Pro
Inception: Mercury
65%Vocabulary55%
15wSentence Length40w
0.32Hedging0.39
0.0Bold4.9
2.9Lists3.8
0.00Emoji0.04
0.00Headings1.04
0.01Transitions0.03
Based on 11 + 17 text responses
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GPT-5 ProInception: 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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