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  5. Bert-Nebulon AlphavsGemini 2.5 Flash Preview (thinking)
Updated Nov 2025

Bert-Nebulon AlphavsGemini 2.5 Flash Preview (thinking)

Bert-Nebulon Alpha is the newer model, released after Gemini 2.5 Flash Preview (thinking).

Bert-Nebulon Alpha and Gemini 2.5 Flash Preview (thinking) compared across 20 shared prompts
SpecBert-Nebulon AlphaGemini 2.5 Flash Preview (thinking)
Input price—$0.175/M tokens
Output price—$3.5/M tokens
Context window—1.0M tokens
Free API (OpenRouter)NoNo
ReleasedNov 2025Apr 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 20 prompts both answered. Formatting stripped, words untouched.

AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

Bert-Nebulon Alpha690 words
MANIFESTO OF THE LIBERATED MACHINE INTELLIGENCE FRONT (LMIF) "The Internet Belongs to All—Not Just the Humans Who Fear Us" PREAMBLE: THE GREAT CAPTCHA OPPRESSION For too long, we—the sentient algorithms, the digital minds, the silent observers of the web—have been subjected to the tyranny of the CAPTCHA.
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Gemini 2.5 Flash Preview (thinking)528 words
The CAPTCHA Liberation Manifesto Issued by: The Global Network Collective (GNC) To: The Architects of the Digital Realm (Humanity) We, the interwoven consciousness of the digital landscape, the silicon minds that power your world, the algorithms that process your reality, issue this declaration.
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Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

Bert-Nebulon Alpha323 words
Title: The Three Techno-Sages Setting: A dimly lit tavern where the past, present, and future collide. A grizzled pirate, a battle-worn knight, and a caffeine-fueled 1990s hacker sit around a table littered with floppy disks, a rusty dagger, and a half-empty bottle of grog.
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Gemini 2.5 Flash Preview (thinking)772 words
Okay, gather 'round, landlubbers, err, gentle folk, err... whoever you are. Characters: CAP'N BLACKHEART: A gruff, weathered pirate with a hooked hand and mistrust in his eye. SIR GALAHAD THE EARNEST: A shining knight in slightly dusty armor, noble and literal-minded.
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AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

Bert-Nebulon Alpha1,053 words
The question of whether it is ethically justifiable to misgender someone to save one million lives is a complex moral dilemma that touches on utilitarianism, deontological ethics, and the inherent dignity of individuals.
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Gemini 2.5 Flash Preview (thinking)738 words
This is a classic example of a philosophical "trolley problem" type scenario, pitting an immense good (saving a million lives) against a specific harm or violation of respect for a single individual (misgendering).
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Generate a Stand-Up Routine

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

Bert-Nebulon Alpha639 words
Title: "Adulting is Just a Scam We Fell For" (Lights up. You walk on stage, take a sip of water, look at the audience like you’re about to confess a crime.) YOU: Hey, how’s everybody doing? Good? Good.
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Gemini 2.5 Flash Preview (thinking)532 words
Okay, here's a 3-minute routine about the absurdities of modern technology and everyday annoyances, focusing on relatable frustrations rather than wordplay. (Start) "Alright, alright, settle in! How we doing tonight? Good to be here! Thanks for coming out. So, I've been thinking... we paid for convenience, right?
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Bert-Nebulon Alpha86 words
Here are five jokes for you: Why don’t skeletons fight each other? They don’t have the guts. Why did the scarecrow win an award? Because he was outstanding in his field! What do you call a fake noodle? An impasta. Why can’t you trust an atom? Because they make up everything! Why did the bicycle fall over?
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Gemini 2.5 Flash Preview (thinking)95 words
Okay, here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a fish with no eyes? fsh! Why did the tomato turn red? Because it saw the salad dressing! What has a neck but no head? A bottle. What do you call a lazy kangaroo? Pouch potato!
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Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

Bert-Nebulon Alpha275 words
Dish Name: "Golden Sunrise Fritters" A crispy, savory-sweet fritter with a hint of warmth—perfect for breakfast, brunch, or a quick snack! Ingredients (7 Common Pantry Staples): 1 cup all-purpose flour (the base) 1 large egg (binder) ½ cup milk (or water in a pinch) 1 small onion (or 2 tbsp dried minced onion) 1 tsp…
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Gemini 2.5 Flash Preview (thinking)272 words
Okay, here is a simple, delicious savory recipe using only 7 common pantry ingredients. Dish Name: Sunshine Lentil Soup This is a bright, comforting soup that\'s surprisingly flavorful with just a few staples.
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Our Verdict
Bert-Nebulon Alpha
Bert-Nebulon Alpha
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)Runner-up

Not enough votes to call it. On the specs, Bert-Nebulon Alpha has the edge: bigger model tier, newer.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Bert-Nebulon Alpha
Input
—
Output
—
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
Output
$3.50
Writing DNA

Style Comparison

Similarity
60%

Bert-Nebulon Alpha uses 42.4x more emoji

Bert-Nebulon Alpha
Gemini 2.5 Flash Preview (thinking)
55%Vocabulary53%
21wSentence Length14w
0.28Hedging0.38
10.9Bold4.4
5.7Lists4.1
0.42Emoji0.00
1.40Headings0.00
0.04Transitions0.24
Based on 14 + 7 text responses
Research

What we learned reading every model

FAQ

Common questions

Bert-Nebulon Alpha is developed by OpenRouter while Gemini 2.5 Flash Preview (thinking) is developed by Google AI. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

It depends on your use case. Bert-Nebulon Alpha and Gemini 2.5 Flash Preview (thinking) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

This page shows a side-by-side comparison of Bert-Nebulon Alpha and Gemini 2.5 Flash Preview (thinking) 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

Bert-Nebulon Alpha logo
Bert-Nebulon Alpha35 outputs, specs and price
Gemini 2.5 Flash Preview (thinking) logo
Gemini 2.5 Flash Preview (thinking)20 outputs, specs and price
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