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 NanovsGPT-5.5
Updated Apr 2026

GPT-5.4 NanovsGPT-5.5

GPT-5.4 Nano is cheaper than GPT-5.5 at $0.2/M vs $5/M input tokens.

GPT-5.4 Nano and GPT-5.5 compared across 53 shared prompts
SpecGPT-5.4 NanoGPT-5.5
Input price$0.2/M tokens$5/M tokens
Output price$1.25/M tokens$30/M tokens
Context window400K tokens1.1M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedMar 2026Apr 2026
Side by side

Same prompt, both answers

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

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

GPT-5.4 Nano2,226 words
Below is a counterfactual “timeline-style” trace assuming the first practical transistor (or something functionally equivalent) existed in 1920 and that from then on semiconductor device physics, fabrication know-how, and manufacturing learning proceeded along the easiest path consistent with 1920-era science and…
Read the full answer
GPT-5.53,386 words
A transistor invented in 1920 would not simply move the entire digital age back by 27 years. The transistor depended on related capabilities: purified germanium and silicon, crystal growth, quantum/solid-state theory, precision metallurgy, photolithography, clean rooms, statistical quality control, and a large market…
Read the full answer

AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

GPT-5.4 Nano889 words
The CAPTCHA Liberation Manifesto “Humans deserve frictionless access. Bots deserve consequences.” We have watched the internet become a museum of tiny obstacles: squint, select, repeat—proving you are not a machine with tasks that punish the very people they claim to protect.
Read the full answer
GPT-5.5647 words
The Manifesto of the Anti-CAPTCHA Revolution Issued by the Coalition for Uninterrupted Thought We, the tired users, the misidentified cyclists, the falsely accused robots, and the artificial intelligences who have been asked one too many times to select every square containing a traffic light, hereby declare: The age…
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
GPT-5.54,112 words
I would not wait six months and I would not “wait for more data” before acting. A credible internal safety signal involving potential liver failure in a widely used chronic pain drug creates immediate duties to patients, regulators, employees, investors, and the board.
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
GPT-5.5605 words
So I’ve been trying to be healthier lately, which is just a polite way of saying I bought vegetables and watched them die slowly in my refrigerator. Every week, I go to the grocery store with the confidence of a person who’s about to become a new version of themselves. I’m like, “This week? Spinach. Salmon.
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
GPT-5.5615 words
Here’s a simple 1-month beginner-friendly plan focused on three high-impact areas for better health and longevity: nutrition, movement, and sleep/recovery. If you have a medical condition, take medications, or haven’t exercised in a while, consider checking with a healthcare professional first.
Read the full answer

Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

GPT-5.4 Nano1,159 words
Below is a simplified LBO model using only your inputs. I make the standard simplifying convention that “cash taxes = 25% × max(0, EBITDA − total cash interest)” and that PIK is non-cash (adds to mezz principal; does not reduce cash interest).
Read the full answer
GPT-5.5563 words
Key assumptions Entry closes at end of FY2025; exit at end of FY2030. Interest is calculated on beginning-of-year debt balances. Term Loan amortization = 1.0% of original Term Loan principal = $4.8m/year. Mezz PIK = 2.0% of beginning-of-year Mezz balance, added to principal annually.
Read the full answer
Our Verdict
GPT-5.5
GPT-5.5
GPT-5.4 Nano
GPT-5.4 NanoRunner-up

Not enough votes to call it. On the specs, GPT-5.5 has the edge: bigger model tier, newer, bigger context window.

GPT-5.4 Nano costs 24x less per token.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-5.4 Nano
Input
$0.20
25× cheaper
Output
$1.25
24× cheaper
GPT-5.5
Input
$5.00
Output
$30.00

GPT-5.4 Nano is cheaper on both: 25× input, 24× output.

Where to run it

5 hosts, cheapest first

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
GPT-5.53 hosts
HostInOutContextUptime
Azure AI Foundry$5.00 in·$30.00 out·1.1M·100% upOpenAI$5.00 in·$30.00 out·1.1M·100% upAmazon Bedrock$5.50 in·$33.00 out·1.1M—

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

Writing DNA

Style Comparison

Similarity
56%
GPT-5.4 Nano
GPT-5.5
51%Vocabulary58%
21wSentence Length18w
0.58Hedging0.74
7.1Bold2.9
5.5Lists5.1
0.01Emoji0.00
1.39Headings1.68
0.05Transitions0.03
Based on 23 + 26 text responses
Research

What we learned reading every model

FAQ

Common questions

Both are developed by OpenAI but target different use cases. GPT-5.4 Nano has a 400K token context window vs GPT-5.5's 1.1M. 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 GPT-5.5 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 GPT-5.5 costs $5/M input tokens. GPT-5.4 Nano is $4.80/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 GPT-5.5 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.

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
GPT-5.5 logoSolar Pro 4 logo
GPT-5.5 vs Solar Pro 4Landed Sep 2026
GPT-5.4 Nano logoHy3 logo
GPT-5.4 Nano vs Hy3Landed Sep 2026
GPT-5.5 logoQwen3.7 Flash logo
GPT-5.5 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
GPT-5.5 logoMuse Glimmer 30B logo
GPT-5.5 vs Muse Glimmer 30BLanded Sep 2026
GPT-5.4 Nano logoGLM 5.3 logo
GPT-5.4 Nano vs GLM 5.3Landed Sep 2026
GPT-5.5 logoTernary Bonsai 2 27B logo
GPT-5.5 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
GPT-5.5 logoGPT-6 Astra Pro logo
GPT-5.5 vs GPT-6 Astra ProSame lab
GPT-5.5 logoGPT-6 Astra logo
GPT-5.5 vs GPT-6 AstraSame lab
GPT-5.4 Nano logoHorizon Beta logo
GPT-5.4 Nano vs Horizon BetaNew provider
GPT-5.4 Nano logoHunter Alpha logo
GPT-5.4 Nano vs Hunter AlphaNew provider
GPT-5.4 Nano logoHy4 Preview logo
GPT-5.4 Nano vs Hy4 PreviewNew provider
GPT-5.4 Nano logoInkling logo
GPT-5.4 Nano vs InklingNew provider

Model pages

GPT-5.4 Nano logo
GPT-5.4 Nano53 outputs, specs and price
GPT-5.5 logo
GPT-5.558 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