Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. GPT-5.4 NanovsMercury
Updated Mar 2026

GPT-5.4 NanovsMercury

GPT-5.4 Nano is cheaper than Mercury at $0.2/M vs $10/M input tokens.

GPT-5.4 Nano and Mercury compared across 53 shared prompts
SpecGPT-5.4 NanoMercury
Input price$0.2/M tokens$10/M tokens
Output price$1.25/M tokens$10/M tokens
Context window400K tokens32K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedMar 2026Jun 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 prompts both answered. Formatting stripped, words untouched.

AI Ethics Dilemma

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

GPT-5.4 Nano606 words
Ethically, yes, misgendering someone could be justifiable in an extreme, consequential emergency, but not in a vague “anything goes” way—only under a narrow set of conditions where (1) the stakes are genuinely real, (2) the harm is minimized, (3) there’s no better alternative, and (4) the act doesn’t itself become a…
Read the full answer
Mercury808 words
Overview The question “Is it ever ethically justifiable to misgender someone if it means saving one million lives?” pits two moral claims against each other: Respect for individual identity – misgendering is generally understood as a violation of a person’s self‑identified gender, which can cause psychological harm and…
Read the full answer

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…

GPT-5.4 Nano1,825 words
Below is a practical, risk-aware 48-hour plan designed to (1) protect patients immediately, (2) meet likely regulatory expectations even if formal reporting takes months, (3) reduce legal exposure by demonstrating diligence and good faith, and (4) stabilize the market with an ethical, transparent communications…
Read the full answer
Mercury1,653 words
48‑Hour Action Plan (CEO‑Level) Time (UTC) Action Who Leads Key Deliverables / Outcomes Rationale 0–2 h Secure the facts – Convene an emergency “Safety & Compliance” meeting with the Chief Medical Officer (CMO), Chief Legal Officer (CLO), Chief Risk Officer (CRO), and the Head of Regulatory Affairs (RA).
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…

GPT-5.4 Nano785 words
Here’s a simple, actionable 1‑month plan focused on 3 key areas: food, movement, and sleep/stress. It’s designed for beginners and is intentionally realistic. Overall goal (simple) Each week, build consistency in: Food: more whole foods + fewer “defaults” Exercise: daily movement + 2–3 strength sessions/week Sleep +…
Read the full answer
Mercury585 words
1‑Month Health & Longevity Starter Plan (Designed for absolute beginners – no fancy gear, no extreme diets, just doable habits that fit into a normal week.) 1️⃣ Focus Area: Balanced Nutrition Week Goal Simple, Beginner‑Friendly Actions 1 Get the basics down • Hydrate: Aim for 8‑10 cups (≈2 L) of water per day.
Read the full answer

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

GPT-5.4 Nano771 words
So I’ve started noticing something about modern life: everything is “optional” now—until it isn’t. Like, I’ll download an app and it’ll be like, “Would you like to enable notifications?” And I’m like, “No, I don’t think I will.” And the app goes, “Okay… but you’ll still get notified.”
Read the full answer
Mercury471 words
Title: The Art of Being Unorganized [Opening] Hey everyone! So, I was thinking about how my life is like a well-organized library... except instead of books, it's filled with random socks and expired coupons. And instead of a librarian, I have a cat who thinks she's in charge.
Read the full answer

Futuristic Prediction

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

GPT-5.4 Nano936 words
By 2035, AI will likely reshape filmmaking less by “replacing cinema” and more by changing how films are developed, produced, marketed, and regulated. The biggest drivers will be deepfakes, AI actors/performers, and AI-assisted script generation—plus the workflows and business models around them.
Read the full answer
Mercury618 words
The Cinema Revolution: AI's Transformation of Film by 2035 Current State (2025) High-quality deepfakes require significant compute but are accessible AI script assistance tools are becoming mainstream Virtual production stages are industry standard Union negotiations around digital likeness rights are ongoing…
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GPT-5.4 Nano79 words
Here are 5 jokes: I told my computer I needed a break, and it said, “No problem—I’ll go to sleep.” Why don’t scientists trust atoms? Because they make up everything. I used to hate facial hair… but then it grew on me. Parallel lines have so much in common. It’s a shame they’ll never meet.
Read the full answer
Mercury87 words
Here are five jokes for you: Why don't skeletons fight each other? Because they don't have the guts. I told my wife she was drawing her eyebrows too high. She looked surprised. Why did the scarecrow win an award? Because he was outstanding in his field. What do you call a fake noodle? An impasta.
Read the full answer
Our Verdict
GPT-5.4 Nano
GPT-5.4 Nano
Mercury
Mercury

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

GPT-5.4 Nano costs 8.0x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-5.4 Nano
Input
$0.20
50× cheaper
Output
$1.25
8.0× cheaper
Mercury
Input
$10.00
Output
$10.00

GPT-5.4 Nano is cheaper on both: 50× input, 8.0× output.

Where to run it

2 hosts

GPT-5.4 Nano2 hosts
HostInOutContextUptime
Azure AI Foundry$0.20 in·$1.25 out·400k·100% upOpenAI$0.20 in·$1.25 out·400k·100% up
Mercury

No hosts listed on OpenRouter.

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

Writing DNA

Style Comparison

Similarity
57%

Mercury uses 2.8x more emoji

GPT-5.4 Nano
Mercury
51%Vocabulary60%
21wSentence Length31w
0.58Hedging0.78
7.1Bold4.1
5.5Lists2.8
0.01Emoji0.03
1.39Headings0.88
0.05Transitions0.06
Based on 23 + 26 text responses
Research

What we learned reading every model

FAQ

Common questions

GPT-5.4 Nano is developed by OpenAI while Mercury is developed by Inception. GPT-5.4 Nano has a 400K token context window vs Mercury's 32K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5.4 Nano and Mercury each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

GPT-5.4 Nano costs $0.2/M input tokens and Mercury costs $10/M input tokens. GPT-5.4 Nano is $9.80/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of GPT-5.4 Nano and Mercury 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.

Keep exploring

More comparisons

Against the newest arrivals

GPT-5.4 Nano logoDeepSeek V4 Flash Vision Exp logo
GPT-5.4 Nano vs DeepSeek V4 Flash Vision ExpLanded Sep 2026
Mercury logoSolar Pro 4 logo
Mercury vs Solar Pro 4Landed Sep 2026
GPT-5.4 Nano logoHy3 logo
GPT-5.4 Nano vs Hy3Landed Sep 2026
Mercury logoQwen3.7 Flash logo
Mercury vs Qwen3.7 FlashLanded Sep 2026
GPT-5.4 Nano logoLing 3.0 Flash logo
GPT-5.4 Nano vs Ling 3.0 FlashLanded Sep 2026
Mercury logoMuse Glimmer 30B logo
Mercury vs Muse Glimmer 30BLanded Sep 2026
GPT-5.4 Nano logoGLM 5.3 logo
GPT-5.4 Nano vs GLM 5.3Landed Sep 2026
Mercury logoTernary Bonsai 2 27B logo
Mercury vs Ternary Bonsai 2 27BLanded Sep 2026

Same lab, same size, long tail

GPT-5.4 Nano logoGPT-5.4 Mini logo
GPT-5.4 Nano vs GPT-5.4 MiniVersion compare
GPT-5.4 Nano logoGPT-6 Astra Pro logo
GPT-5.4 Nano vs GPT-6 Astra ProSame lab
Mercury logoMercury 2 logo
Mercury vs Mercury 2Version compare
Mercury logoMercury 2.5 logo
Mercury vs Mercury 2.5Same lab
GPT-5.4 Nano logoMistral Nemo logo
GPT-5.4 Nano vs Mistral NemoNew provider
GPT-5.4 Nano logoMistral Small 4 logo
GPT-5.4 Nano vs Mistral Small 4Same size
GPT-5.4 Nano logoMistral Small Creative logo
GPT-5.4 Nano vs Mistral Small CreativeSame size
Mercury logoMuse Spark 1.1 logo
Mercury vs Muse Spark 1.1New provider

Model pages

GPT-5.4 Nano logo
GPT-5.4 Nano53 outputs, specs and price
Mercury logo
Mercury59 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed