What is the difference between Gemini 2.5 Flash Preview (thinking) and Mercury 2.5?

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while Mercury 2.5 is developed by Inception. Gemini 2.5 Flash Preview (thinking) has a 1.0M token context window vs Mercury 2.5's 260K. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview (thinking) or Mercury 2.5?

It depends on your use case. Gemini 2.5 Flash Preview (thinking) and Mercury 2.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview (thinking) cost compared to Mercury 2.5?

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and Mercury 2.5 costs $0.04/M input tokens. Mercury 2.5 is $0.13/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 2.5 Flash Preview (thinking) and Mercury 2.5 on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview (thinking) and Mercury 2.5 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.

Updated Sep 2026

Gemini 2.5 Flash Preview (thinking)vsMercury 2.5

Mercury 2.5 is cheaper than Gemini 2.5 Flash Preview (thinking) at $0.04/M vs $0.175/M input tokens.

Gemini 2.5 Flash Preview (thinking) and Mercury 2.5 compared across 2 shared prompts
Spec	Gemini 2.5 Flash Preview (thinking)	Mercury 2.5
Input price	$0.175/M tokens	$0.04/M tokens
Output price	$3.5/M tokens	$0.15/M tokens
Context window	1.0M tokens	260K tokens
Free API (OpenRouter)	No	No
Released	Apr 2025	Sep 2026

Side by side

Same prompt, both answers

Opening lines from every prompt both answered. Formatting stripped, words untouched.

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…

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.

Read the full answer

Mercury 2.5190 words

Pantry Pasta Primavera Prep Time: 5 minutes Cook Time: 15 minutes Servings: 2 Ingredients (7 Common Pantry Items) Pasta (spaghetti, penne, or fusilli) – 8 oz Canned crushed tomatoes – 1 can (14 oz) Olive oil – 3 tablespoons Garlic powder – 1 teaspoon Dried oregano – 1 teaspoon Parmesan cheese (grated) – ½ cup Salt and…

Read the full answer

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 (thinking)867 words

Okay, here is a simple, actionable 1-month plan for a beginner focusing on Diet, Exercise, and Sleep for better health and longevity. Goal: To build foundational, sustainable habits in 3 key health areas over 30 days.

Read the full answer

Mercury 2.5325 words

Here is a simple, actionable 1-month plan to kickstart your journey toward better health and longevity. This guide focuses on three foundational pillars: Nutrition, Movement, and Sleep. Week 1: Awareness & Small Wins Goal: Build habits without overwhelming yourself.

Read the full answer

Our Verdict

Gemini 2.5 Flash Preview (thinking)

Mercury 2.5

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

Mercury 2.5 costs 23x less per token.

Too close to call

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview (thinking)

Input

$0.17

Output

$3.50

Mercury 2.5

Input

$0.04

4.4× cheaper

Output

$0.15

23× cheaper

Mercury 2.5 is cheaper on both: 4.4× input, 23× output.

Where to run it

1 host

Gemini 2.5 Flash Preview (thinking)

No hosts listed on OpenRouter.

Mercury 2.51 host

HostInOutContextUptime

Inception$0.04 in$0.15 out260k100% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Same prompt, both answers

Simple 7-Ingredient Recipe

Beginner's Longevity Plan

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between Gemini 2.5 Flash Preview (thinking) and Mercury 2.5?

Which is better, Gemini 2.5 Flash Preview (thinking) or Mercury 2.5?

How much does Gemini 2.5 Flash Preview (thinking) cost compared to Mercury 2.5?

How can I compare Gemini 2.5 Flash Preview (thinking) and Mercury 2.5 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Same prompt, both answers

Simple 7-Ingredient Recipe

Beginner's Longevity Plan

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between Gemini 2.5 Flash Preview (thinking) and Mercury 2.5?

Which is better, Gemini 2.5 Flash Preview (thinking) or Mercury 2.5?

How much does Gemini 2.5 Flash Preview (thinking) cost compared to Mercury 2.5?

How can I compare Gemini 2.5 Flash Preview (thinking) and Mercury 2.5 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages