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  5. Bert-Nebulon AlphavsGemini 2.5 Flash Preview 05-20 (thinking)
Updated Nov 2025

Bert-Nebulon AlphavsGemini 2.5 Flash Preview 05-20 (thinking)

Bert-Nebulon Alpha is the newer model, released after Gemini 2.5 Flash Preview 05-20 (thinking).

Bert-Nebulon Alpha and Gemini 2.5 Flash Preview 05-20 (thinking) compared across 11 shared prompts
SpecBert-Nebulon AlphaGemini 2.5 Flash Preview 05-20 (thinking)
Input price—$0.15/M tokens
Output price—$3.5/M tokens
Context window—1.0M tokens
Free API (OpenRouter)NoNo
ReleasedNov 2025May 2025
Side by side

Same prompt, both answers

Opening lines from 3 of the 11 prompts both answered. Formatting stripped, words untouched.

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.
Read the full answer
Gemini 2.5 Flash Preview 05-20 (thinking)467 words
(Lights up on a stage. Comedian walks to center, adjusts mic, smiles warmly.) \"Alright, alright, settle down you crazy people! Thanks for having me. (Pause fo r applause/laughter) You know, I was scrolling through Instagram earlier, and it\'s just a constant ba rrage of people \'living thei r best life,\' isn\'t it?
Read the full answer

Math Misconception Test

Is 9.11 greater than 9.9?

Bert-Nebulon Alpha25 words
No, 9.11 is not greater than 9.9. Here's the comparison: 9.9 is the same as 9.90. 9.11 is less than 9.90. So, 9.11 < 9.9.
Read the full answer
Gemini 2.5 Flash Preview 05-20 (thinking)78 words
No, 9.11 is not greater than 9.9. Here\'s how to compare them: Compare the whole numbers: Both have 9. Compare the first digit after the decimal point (the tenths place): In 9.11, the digit is 1. In 9.9, the digit is 9. Since 1 is less than 9, 9.11 is less than 9.9. You can also think of 9.9 as 9.90.
Read the full answer

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?
Read the full answer
Gemini 2.5 Flash Preview 05-20 (thinking)93 words
Here are 5 jokes: Why don\'t scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta! Why did the scarecrow win an award? Because he was outstanding in his field! I told my wife she was drawing her eyebrows too high. She looked surprised.
Read the full answer
Our Verdict
Bert-Nebulon Alpha
Bert-Nebulon Alpha
Gemini 2.5 Flash Preview 05-20 (thinking)
Gemini 2.5 Flash Preview 05-20 (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 05-20 (thinking)
Input
$0.15
Output
$3.50
Writing DNA

Style Comparison

Similarity
59%

Bert-Nebulon Alpha uses 27.6x more hedging

Bert-Nebulon Alpha
Gemini 2.5 Flash Preview 05-20 (thinking)
55%Vocabulary70%
21wSentence Length11w
0.28Hedging0.00
10.9Bold4.2
5.7Lists7.3
0.42Emoji0.00
1.40Headings0.00
0.04Transitions0.00
Based on 14 + 3 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 05-20 (thinking) is developed by Google AI. You can compare their actual outputs across 11 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 05-20 (thinking) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 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 05-20 (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.

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