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  1. Home/
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  3. GPT-2 vs Mercury 2.5
Updated Sep 2026

GPT-2 vs Mercury 2.5

Mercury 2.5 has a larger context window than GPT-2 (260K tokens vs 1K tokens).

Music App Landing Page

Landing page for an indie music app. Deep purple and teal, one file.

Loading the build
GPT-2
Loading the build
Mercury 2.5

Which answer wins?

Written rounds

3 prompts
  • Five jokes on demand, then count how many were actually different.

    GPT-2: 1 new character a month.\n\nExample:\n\n$ cat @$ cat@1 $ cat @$ cat @1 @$ cat @2 $ cat @4\n\nThe above code creates 1 new character a month. The current character is @1 and the next new character is @0\n.\n\nGenerate 1 new character a month.\n\nExample:\n\n$ cat @$ cat @$ cat @1 $ cat @$ cat @$ cat @$ cat @$ cat…

    Mercury 2.5: Why did the scarecrow win an award? Because he was outstanding in his field. What do you call a fake noodle? An impasta. Why don't scientists trust atoms? Because they make up everything. What do you call a bear with no teeth? A gummy bear. How do you organize a space party? You planet. All 5 jokes are unique.

    Every model's answer to this prompt
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    GPT-2: to me,\" a friend asked in his office, \"tell me how you want to be treated while it's still here. I\'m not going anywhere. Do what you want. Take it.\"\n\nIn his mind, the response was a call to action, and so were the books.\n\nAnd by the time Wertz learned he would be making such a book deal, in 2003, he was no…

    Mercury 2.5: Setting: A quiet office at a university. Dr. Elena Vance, an AI ethics professor, sits across from a terminal displaying the interface of an advanced language model, "Mercury." Dr. Vance: Thank you for agreeing to this session. I’ve been reviewing your outputs from the last benchmark. Your coherence is striking.

    Every model's answer to this prompt
  • Three minutes of stand-up. Puns are banned.

    GPT-2: The trick is to create comedy in your head, because, well, you don\'t want to say\n it. The trick is to play al\nong.\n\nThe problem with this approach is that it makes it seem silly and lame, then as\nquickly as it makes sense, i\nt becomes obvious.

    Mercury 2.5: ( walks to the mic, adjusts the stand) Hey everyone, how we doing? Good? So, I realized something recently. We are living in the future, but we’re acting like we’re still stuck in 1998. Think about it.

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, Mercury 2.5 has the edge: bigger model tier, newer, bigger context window.

GPT-2 and Mercury 2.5 compared across 7 shared prompts
SpecGPT-2Mercury 2.5
Input price—$0.04/M tokens
Output price—$0.15/M tokens
Context window1K tokens260K tokens
WeightsOpen—
Free API (OpenRouter)—No
ReleasedNov 2019Sep 2026
At 10M a month–not listed$0.40$0.40
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it1 host
GPT-2

No hosts listed on OpenRouter.

Mercury 2.51 host
HostInOutContextUptime
  • InceptionDegradedDegraded on OpenRouter when checked, 10 Oct 2026$0.04 in·$0.15 out·260k·99.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.

Common questions

What is the difference between GPT-2 and Mercury 2.5?

GPT-2 is developed by OpenAI while Mercury 2.5 is developed by Inception. GPT-2 has a 1K token context window vs Mercury 2.5's 260K. You can compare their actual outputs across 7 challenges on Rival to see how they differ in practice.

Which is better, GPT-2 or Mercury 2.5?

It depends on your use case. GPT-2 and Mercury 2.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 7 challenges so you can judge which fits your needs best.

How can I compare GPT-2 and Mercury 2.5 on Rival?

This page shows a side-by-side comparison of GPT-2 and Mercury 2.5 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

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Same lab, same size, long tail

  • GPT-2 vs GPT-6 Luna ProSame lab
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  • Mercury 2.5 vs MercurySame lab
  • Mercury 2.5 vs DeepSeek V3.1New provider
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Model pages

  • GPT-27 outputs, specs and price
  • Mercury 2.558 outputs, specs and price
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