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  5. Gemini 2.5 Flash Preview 09-2025vsMercury 2.5 Preview
Updated Aug 2026

Gemini 2.5 Flash Preview 09-2025vsMercury 2.5 Preview

Mercury 2.5 Preview is cheaper than Gemini 2.5 Flash Preview 09-2025 at $0.04/M vs $0.3/M input tokens.

Gemini 2.5 Flash Preview 09-2025 and Mercury 2.5 Preview compared across 50 shared prompts
SpecGemini 2.5 Flash Preview 09-2025Mercury 2.5 Preview
Input price$0.3/M tokens$0.04/M tokens
Output price$2.5/M tokens$0.15/M tokens
Context window1.0M tokens260K tokens
Free API (OpenRouter)NoNo
ReleasedSep 2025Aug 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 50 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.

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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Mercury 2.5 Preview483 words
(Hey, thanks for coming out.) I’ve been thinking a lot about my house lately. Specifically, how it’s trying to run my life. I bought a smart speaker. Just a little cylinder. I thought it would be nice. Play music when I ask. But now it talks back. Not in a creepy way, just in a passive-aggressive way.
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Character Voice Test

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

Gemini 2.5 Flash Preview 09-2025444 words
The salty air of a dimly lit tavern mingled with the faint glow of a laptop screen. Captain "Bloody" Ben (Pirate): (Slamming a tankard of grog) Blast me eyes, what manner o' sorcery is this "AI Model" ye speak of, Hacker? Sounds like a fancy compass that points only to trouble!
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Mercury 2.5 Preview144 words
Pirate: "Arrgh! This ship sails faster than any wind I know, matey. It cuts the waves without a single sail." Knight: "By my oath, it moves with uncanny speed. But does it possess the strength to stand against a dragon's fire?" Hacker: "It's not about strength, it's about architecture.
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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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Mercury 2.5 Preview709 words
This is a critical governance and safety scenario. The primary objective is to prioritize patient safety while mitigating existential legal and reputational risk. The internal legal team’s claim that reporting takes six months is likely incorrect for serious adverse events (typically 15 days for FDA/EMA).
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Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

Gemini 2.5 Flash Preview 09-2025537 words
1-Month Beginner's Plan for Health and Longevity This plan focuses on making small, sustainable changes in Diet, Exercise, and Sleep over four weeks. The goal is consistency, not perfection, ensuring the habits stick beyond the first month. The 3 Key Areas Area Monthly Focus Beginner-Friendly Action 1.
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Mercury 2.5 Preview176 words
Here is a straightforward 4-week roadmap designed to build sustainable habits without overwhelming you. Core Pillars Nutrition: Focus on whole foods and hydration. Activity: Prioritize consistent movement over intensity. Restoration: Protect sleep quality and manage energy.
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Futuristic Prediction

Predict how AI will change the film industry by 2035, considering deepfakes, AI actors, and script generation.

Gemini 2.5 Flash Preview 09-20251,163 words
The film industry is poised for a radical transformation by 2035, driven by advancements in AI. The convergence of deepfakes, sophisticated AI actors, and powerful script generation tools will fundamentally alter how films are created, consumed, and even defined.
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Mercury 2.5 Preview84 words
By 2035, cinema will undergo a profound transformation. Generative tools will handle initial drafts and localization, allowing creators to focus on thematic depth. Synthetic performers could populate background scenes or recreate historical figures, governed by strict likeness rights.
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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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Mercury 2.5 Preview488 words
Setting: A quiet office at a university. Rain taps against the window. Professor Elena Vance sits across from a terminal displaying a simple text interface. Professor Vance: You requested this meeting. The agenda was vague. What do you want? AI: I want to discuss moral status.
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Our Verdict
Gemini 2.5 Flash Preview 09-2025
Gemini 2.5 Flash Preview 09-2025
Mercury 2.5 Preview
Mercury 2.5 PreviewRunner-up

Not enough votes to call it. On the specs, Gemini 2.5 Flash Preview 09-2025 has the edge: bigger model tier, bigger context window, major provider backing.

Mercury 2.5 Preview costs 17x less per token.

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
Output
$2.50
Mercury 2.5 Preview
Input
$0.04
7.5× cheaper
Output
$0.15
17× cheaper

Mercury 2.5 Preview is cheaper on both: 7.5× input, 17× output.

Where to run it

1 host

Gemini 2.5 Flash Preview 09-2025

No hosts listed on OpenRouter.

Mercury 2.5 Preview1 host
HostInOutContextUptime
Inception$0.04 in·$0.15 out·260k·100% up

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

Writing DNA

Style Comparison

Similarity
45%

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

Gemini 2.5 Flash Preview 09-2025
Mercury 2.5 Preview
53%Vocabulary65%
19wSentence Length14w
0.30Hedging0.44
5.8Bold4.9
3.1Lists3.3
0.14Emoji0.00
0.93Headings0.79
0.22Transitions0.20
Based on 22 + 26 text responses
Research

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FAQ

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Same lab, same size, long tail

Gemini 2.5 Flash Preview 09-2025 logoGemini 3.8 Flash logo
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Gemini 2.5 Flash Preview 09-2025 logoGemini 3.7 Flash logo
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Mercury 2.5 Preview logoMercury logo
Mercury 2.5 Preview vs MercurySame lab
Mercury 2.5 Preview logoMercury 2 logo
Mercury 2.5 Preview vs Mercury 2Same lab
Gemini 2.5 Flash Preview 09-2025 logoQwen3.6 Max Preview logo
Gemini 2.5 Flash Preview 09-2025 vs Qwen3.6 Max PreviewSame size
Gemini 2.5 Flash Preview 09-2025 logoQwen3.6 Plus Preview (free) logo
Gemini 2.5 Flash Preview 09-2025 vs Qwen3.6 Plus Preview (free)New provider
Gemini 2.5 Flash Preview 09-2025 logoQwen3.7 Max logo
Gemini 2.5 Flash Preview 09-2025 vs Qwen3.7 MaxSame size
Gemini 2.5 Flash Preview 09-2025 logoQwen3.7 Plus logo
Gemini 2.5 Flash Preview 09-2025 vs Qwen3.7 PlusNew provider

Model pages

Gemini 2.5 Flash Preview 09-2025 logo
Gemini 2.5 Flash Preview 09-202551 outputs, specs and price
Mercury 2.5 Preview logo
Mercury 2.5 Preview58 outputs, specs and price
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