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  5. Gemini 2.5 Flash Preview 05-20vsMercury 2.5 Preview
Updated Aug 2026

Gemini 2.5 Flash Preview 05-20vsMercury 2.5 Preview

Mercury 2.5 Preview is cheaper than Gemini 2.5 Flash Preview 05-20 at $0.04/M vs $0.15/M input tokens.

Gemini 2.5 Flash Preview 05-20 and Mercury 2.5 Preview compared across 11 shared prompts
SpecGemini 2.5 Flash Preview 05-20Mercury 2.5 Preview
Input price$0.15/M tokens$0.04/M tokens
Output price$0.6/M tokens$0.15/M tokens
Context window1.0M tokens260K tokens
Free API (OpenRouter)NoNo
ReleasedMay 2025Aug 2026
Side by side

Same prompt, both answers

Opening lines from 2 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.

Gemini 2.5 Flash Preview 05-20569 words
Alright, alright, settle down you magnificent collection of human beings! You look good tonight. Not just good, but… like you've all collectively decided to nail the 'I'm here to laugh and avoid talking about my Monday' look. And I respect that. Seriously though, it's great to be back on stage. I'm living the dream.
Read the full answer
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.
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Gemini 2.5 Flash Preview 05-2079 words
Here are 5 jokes for you: 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
Mercury 2.5 Preview59 words
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? He was outstanding in his field. What do you call a bear with no teeth? A gummy bear. Why did the bicycle fall over? Because it was two-tired. All 5 jokes are unique.
Read the full answer
Our Verdict
Gemini 2.5 Flash Preview 05-20
Gemini 2.5 Flash Preview 05-20
Mercury 2.5 Preview
Mercury 2.5 Preview

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

Mercury 2.5 Preview costs 4.0x 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 05-20
Input
$0.15
Output
$0.60
Mercury 2.5 Preview
Input
$0.04
3.8× cheaper
Output
$0.15
4.0× cheaper

Mercury 2.5 Preview is cheaper on both: 3.8× input, 4.0× output.

Where to run it

1 host

Gemini 2.5 Flash Preview 05-20

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
53%

Mercury 2.5 Preview uses 78.7x more headings

Gemini 2.5 Flash Preview 05-20
Mercury 2.5 Preview
69%Vocabulary65%
10wSentence Length14w
0.26Hedging0.44
1.1Bold4.9
5.5Lists3.3
0.00Emoji0.00
0.00Headings0.79
0.00Transitions0.20
Based on 2 + 26 text responses
Research

What we learned reading every model

FAQ

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Model pages

Gemini 2.5 Flash Preview 05-20 logo
Gemini 2.5 Flash Preview 05-2011 outputs, specs and price
Mercury 2.5 Preview logo
Mercury 2.5 Preview58 outputs, specs and price
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