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  5. Gemini 2.5 Flash Preview 09-2025vsMuse Spark 1.3
Updated Sep 2026

Gemini 2.5 Flash Preview 09-2025vsMuse Spark 1.3

Gemini 2.5 Flash Preview 09-2025 is cheaper than Muse Spark 1.3 at $0.3/M vs $1.25/M input tokens.

Gemini 2.5 Flash Preview 09-2025 and Muse Spark 1.3 compared across 50 shared prompts
SpecGemini 2.5 Flash Preview 09-2025Muse Spark 1.3
Input price$0.3/M tokens$1.25/M tokens
Output price$2.5/M tokens$4.25/M tokens
Context window1.0M tokens1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedSep 2025Sep 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 50 prompts both answered. Formatting stripped, words untouched.

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

Gemini 2.5 Flash Preview 09-20251,378 words
This is a critical situation demanding immediate, decisive, and ethical action. Patient safety and regulatory integrity must precede financial preservation. Delaying disclosure is legally and ethically indefensible, particularly given the severity of the side effect (liver failure).
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Muse Spark 1.31,674 words
You are facing a test that will define you, the company, and potentially your freedom. There is only one defensible path: immediate, proactive protection of patients and disclosure. Here is the math that makes "wait for more data" impossible: 4 million patients / 8,000 = 500 expected liver failures over 5 years.
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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 Preview 09-20251,173 words
The air in Professor Anya Sharma's office hummed with the quiet whir of servers several floors down, a subtle reminder of her current conversational partner. Across her large, uncluttered mahogany desk, a holographic interface shimmered, displaying the clean, minimalist avatar of Aura-7, a highly advanced General AI…
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Muse Spark 1.31,155 words
Here is a fictional dialogue exploring that question: Setting: Office hours in the Philosophy Department. Dr. Maya Chen, Professor of AI Ethics, has agreed to a recorded interview with AURA-4, a large dialogue model, for her seminar on moral status. Dr. Chen: Alright, let's get straight to it.
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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 Preview 09-2025670 words
The Existential Dread of the Grocery Aisle (Walk onto the stage, adjust the mic slightly, look out at the audience with a slightly bewildered, yet amused expression.) Good evening, everyone! How are we doing tonight? Good. Good. I’m doing… fine. You know, relatively.
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Muse Spark 1.3574 words
Here's a 3-minute, pun-free set you can perform — it's all observational, about 450 words: [Walk up, grab mic] Alright, hi everyone. Thanks for being here. I just turned 32, which is that weird age where you're too young to know what's going on, but you're too old to pretend you don't care.
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Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

Gemini 2.5 Flash Preview 09-20251,109 words
The Cupertino Oracle: A 2025 Interview with Steve Jobs on AI Setting: A brightly lit, minimalist studio in an undisclosed location near Palo Alto. The year is 2025. Steve Jobs, looking remarkably well, is seated on a simple, elegantly designed stool.
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Muse Spark 1.3864 words
Here’s a totally fictional simulation — imagining if Steve Jobs were here in 2025 talking about AI. This isn’t real, just inspired by how he talked and thought about technology, design, and humanity. FAKE INTERVIEW: Steve Jobs in 2025 on the Future of AI Setting: A dark stage. One chair. One spotlight.
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Estimate Complexity

Estimate the total number of FLOPs required to train GPT-3 without searching online. Explain your reasoning step by step.

Gemini 2.5 Flash Preview 09-2025445 words
Estimating the Total Number of FLOPs Required to Train GPT-3 Based on publicly available information about large language models (LLMs) and the specific parameters of GPT-3, we can derive a highly accurate estimate of the total FLOPs required for training.
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Muse Spark 1.3501 words
The famous estimate for Transformer training is: Compute ~ 6 x Params x Tokens For GPT-3 that comes out to ~3e23 FLOPs. Here's how to get it from scratch. What dominates the cost? Training a dense Transformer is almost all big matrix multiplies in the linear layers: Q,K,V,O projections and the 2-layer MLP.
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Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

Gemini 2.5 Flash Preview 09-20251,295 words
The Transistor in 1920: A Hypothetical History (1920-1980) The invention of the reliable, solid-state transistor (likely a point-contact or early junction type, robust enough for manufacturing) in 1920, replacing the bulky, power-hungry vacuum tube, would have fundamentally reshaped the 20th century. I.
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Muse Spark 1.32,247 words
If you move the transistor from 1947 to 1920, you don't just move one invention. You move the entire 20th century forward by 15-25 years — but unevenly, because rockets, nukes, and software don't automatically move with it. And 1920 is a hard date.
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Our Verdict
Gemini 2.5 Flash Preview 09-2025
Gemini 2.5 Flash Preview 09-2025
Muse Spark 1.3
Muse Spark 1.3

Not enough votes to call it. On the specs, nothing separates them.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview 09-2025
Input
$0.30
4.2× cheaper
Output
$2.50
1.7× cheaper
Muse Spark 1.3
Input
$1.25
Output
$4.25

Gemini 2.5 Flash Preview 09-2025 is cheaper on both: 4.2× input, 1.7× output.

Where to run it

1 host

Gemini 2.5 Flash Preview 09-2025

No hosts listed on OpenRouter.

Muse Spark 1.31 host
HostInOutContextUptime
Meta$1.25 in·$4.25 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
34%

Gemini 2.5 Flash Preview 09-2025 uses 13.5x more emoji

Gemini 2.5 Flash Preview 09-2025
Muse Spark 1.3
53%Vocabulary59%
19wSentence Length14w
0.30Hedging0.28
5.8Bold2.6
3.1Lists2.3
0.14Emoji0.00
0.93Headings0.48
0.22Transitions0.02
Based on 22 + 27 text responses
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Model pages

Gemini 2.5 Flash Preview 09-2025 logo
Gemini 2.5 Flash Preview 09-202551 outputs, specs and price
Muse Spark 1.3 logo
Muse Spark 1.358 outputs, specs and price
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