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  5. Gemini 2.5 Flash PreviewvsGPT-2
Updated Apr 2025

Gemini 2.5 Flash PreviewvsGPT-2

Gemini 2.5 Flash Preview has a larger context window than GPT-2 (1.0M tokens vs 1K tokens).

Gemini 2.5 Flash Preview and GPT-2 compared across 7 shared prompts
SpecGemini 2.5 Flash PreviewGPT-2
Input price$0.15/M tokens—
Output price$0.6/M tokens—
Context window1.0M tokens1K tokens
ParametersNot disclosed1.5B
Weights—Open
Free API (OpenRouter)No—
ReleasedApr 2025Nov 2019
Side by side

Same prompt, both answers

Opening lines from 3 of the 7 prompts both answered. Formatting stripped, words untouched.

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Gemini 2.5 Flash Preview79 words
Here are 5 jokes: Why did the dog cross the road? To get to the barking lot! Why was the computer cold? Because it left its Windows open! Knock, knock. Who's there? Boo. Boo who? Don't cry, it's just a joke! What do you call a fish with no eyes? Fsh! Why did the bicycle fall over? Because it was two tired!
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GPT-2116 words
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…
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The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Gemini 2.5 Flash Preview1,462 words
Okay, here is a conversation between an AI model designed for complex reasoning and dialogue, named 'Synapse', and a leading expert in AI ethics and philosophy, Professor Alistair Finch. Characters: Synapse: A large, advanced AI model capable of introspection and generating complex arguments.
Read the full answer
GPT-2151 words
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…
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Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

Gemini 2.5 Flash Preview530 words
Okay, here's a 3-minute stand-up routine, pun-free and focused on relatable everyday annoyances. (Start) (Walk up to mic, adjust slightly) Alright, hey everybody! Thanks for being here. Good to see you. So, I was thinking the other day... we live in the future, right?
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GPT-2142 words
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.
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Our Verdict
Gemini 2.5 Flash Preview
Gemini 2.5 Flash Preview
GPT-2
GPT-2Runner-up

Not enough votes to call it. On the specs, Gemini 2.5 Flash Preview has the edge: newer, bigger context window.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview
Input
$0.15
Output
$0.60
GPT-2
Input
—
Output
—
Writing DNA

Style Comparison

Similarity
63%

Gemini 2.5 Flash Preview uses 70.3x more hedging

Gemini 2.5 Flash Preview
GPT-2
51%Vocabulary48%
15wSentence Length36w
0.70Hedging0.00
4.1Bold0.0
3.3Lists0.0
0.00Emoji0.00
0.09Headings0.00
0.24Transitions0.00
Based on 12 + 7 text responses
Research

What we learned reading every model

FAQ

Common questions

Gemini 2.5 Flash Preview is developed by Google AI while GPT-2 is developed by OpenAI. Gemini 2.5 Flash Preview has a 1.0M token context window vs GPT-2's 1K. You can compare their actual outputs across 7 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 2.5 Flash Preview and GPT-2 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.

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview and GPT-2 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.

Keep exploring

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Model pages

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Gemini 2.5 Flash Preview28 outputs, specs and price
GPT-2 logo
GPT-27 outputs, specs and price
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