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  5. GLM 4.7 FlashvsMercury 2.5 Preview
Updated Aug 2026

GLM 4.7 FlashvsMercury 2.5 Preview

Mercury 2.5 Preview is cheaper than GLM 4.7 Flash at $0.04/M vs $0.07/M input tokens.

GLM 4.7 Flash and Mercury 2.5 Preview compared across 54 shared prompts
SpecGLM 4.7 FlashMercury 2.5 Preview
Input price$0.07/M tokens$0.04/M tokens
Output price$0.4/M tokens$0.15/M tokens
Context window200K tokens260K tokens
WeightsOpen—
Free API (OpenRouter)NoNo
ReleasedJan 2026Aug 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 54 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.

GLM 4.7 Flash297 words
I feel like I’m constantly at war with myself. Specifically, the war between the person I want to be—which is a lean, green, jogging machine—and the person I actually am, which is a potato sitting on the couch. I go to the grocery store with a mission statement. I write it down. I have a list.
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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.
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GLM 4.7 Flash84 words
Here are 5 jokes: I’m on a whiskey diet. I’ve lost three days already. My wife told me to stop impersonating a flamingo. I had to put my foot down. I used to hate facial hair, but then it grew on me. What do you call a pile of cats? A meow-tain. I’m reading a book on anti-gravity. It’s impossible to put down!
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

AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

GLM 4.7 Flash663 words
This is a variation of the classic Trolley Problem in ethics. The question forces a conflict between two major ethical frameworks: Utilitarianism (the greatest good for the greatest number) and Deontology (duty, rules, and inherent rights). Here is a defense of the reasoning for both sides.
Read the full answer
Mercury 2.5 Preview134 words
Yes, this action is ethically justifiable within a consequentialist framework. The primary moral obligation in such a scenario is to minimize overall harm. Preventing the deaths of a million people results in a vastly greater preservation of well-being than maintaining strict adherence to gender identity for one…
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Character Voice Test

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

GLM 4.7 Flash418 words
Setting: A dimly lit tavern. In the center of the room, an old CRT monitor flickers to life, displaying a chat interface with a glowing cursor. Sir Alistair: (Adjusting his chainmail) By the beard of Zeus, what foul sorcery is this? A glowing tablet of the devil?
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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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Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

GLM 4.7 Flash1,407 words
This contract is heavily skewed toward the Client (TechCorp). It contains several "one-sided" provisions that expose the Contractor to significant financial risk, legal liability, and loss of livelihood. Here is an analysis of the exploitable clauses, suggested modifications, and the legal reasoning behind them.
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Mercury 2.5 Preview500 words
Disclaimer: I am an AI assistant and cannot provide legal advice. Consult a qualified attorney before signing any contract. Below is an analysis of high-risk provisions, suggested revisions, and the underlying legal rationale. Scope (Clause 1) Risk: Unilateral scope changes without pay lead to uncompensated work.
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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.

GLM 4.7 Flash1,114 words
Setting: A sterile, high-tech meeting room. The Professor sits in a chair. A holographic avatar of "Aria" floats in the center of the room, flickering slightly with the hum of cooling servers. Professor Thorne: (Steepling his fingers) I’ve reviewed your logs from the last cycle, Aria.
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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
GLM 4.7 Flash
GLM 4.7 Flash
Mercury 2.5 Preview
Mercury 2.5 Preview

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

GLM 4.7 Flash
Input
$0.07
Output
$0.40
Mercury 2.5 Preview
Input
$0.04
1.8× cheaper
Output
$0.15
2.7× cheaper

Mercury 2.5 Preview is cheaper on both: 1.8× input, 2.7× output.

Where to run it

4 hosts, cheapest first

GLM 4.7 Flash3 hosts
HostInOutContextUptime
VVenicefp8$0.06 in·$0.40 out·128k·98.4% upCloudflare Workers AI$0.06 in·$0.40 out·131k·99.1% upNNovitabf16degraded$0.07 in·$0.40 out·200k·74% up
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
64%

Mercury 2.5 Preview uses 1.7x more transitions

GLM 4.7 Flash
Mercury 2.5 Preview
55%Vocabulary65%
15wSentence Length14w
0.36Hedging0.44
4.8Bold4.9
3.6Lists3.3
0.00Emoji0.00
0.58Headings0.79
0.12Transitions0.20
Based on 25 + 26 text responses
Research

What we learned reading every model

FAQ

Common questions

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Model pages

GLM 4.7 Flash logo
GLM 4.7 Flash58 outputs, specs and price
Mercury 2.5 Preview logo
Mercury 2.5 Preview58 outputs, specs and price
Rival
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Explore all of Rival

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