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
  • 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-5.5vsGPT-6 Astra
Updated Sep 2026

GPT-5.5vsGPT-6 Astra

GPT-5.5 is cheaper than GPT-6 Astra at $5/M vs $10/M input tokens.

GPT-5.5 and GPT-6 Astra compared across 54 shared prompts
SpecGPT-5.5GPT-6 Astra
Input price$5/M tokens$10/M tokens
Output price$30/M tokens$50/M tokens
Context window1.1M tokens1.1M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedApr 2026Sep 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 54 prompts 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…

GPT-5.5125 words
Smoky Sunset Chickpea Skillet 7 Pantry Ingredients 1 can chickpeas, undrained 1 can diced tomatoes 2 tablespoons olive oil 1 teaspoon garlic powder 1 teaspoon smoked paprika 1/2 teaspoon ground cumin 1/2 teaspoon salt Estimated Time Prep time: 5 minutes Cook time: 15 minutes Total time: 20 minutes Instructions Heat the…
Read the full answer
GPT-6 Astra200 words
Cinnamon Hug Cookies Buttery cookies with crisp edges, soft centers, and a cozy cinnamon flavor. Makes: About 20 cookies Prep: 10 minutes Cook: 10–12 minutes per batch Ingredients — exactly 7 1½ cups all-purpose flour ¾ cup granulated sugar, divided ½ cup salted butter, softened 1 large egg 1 teaspoon vanilla extract ½…
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GPT-5.569 words
Why don’t skeletons fight each other? They don’t have the guts. I told my computer I needed a break, and it said, “No problem—I’ll go to sleep.” Why did the scarecrow win an award? Because he was outstanding in his field. I used to be a baker, but I couldn’t make enough dough. Why can’t you trust stairs?
Read the full answer
GPT-6 Astra76 words
My calendar is afraid of commitment—its days are numbered. I bought a treadmill for my cat. Now I own a very expensive nap conveyor. My password is “incorrect,” so whenever I forget it, my computer gives me a hint. I asked the librarian where the books on denial were. She said, “We don’t have those.” Nice try.
Read the full answer

Generate a Stand-Up Routine

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

GPT-5.5605 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
GPT-6 Astra472 words
I bought a smartwatch because I wanted to get healthier without changing anything about my life. That’s the dream, right? Same habits, but now there’s a graph. The watch congratulates me for standing up. That’s where I am physically. Getting out of a chair is an achievement with a little fireworks animation.
Read the full answer

Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

GPT-5.53,819 words
Below is a comprehensive review of the architecture’s likely failure modes, race conditions, and scaling bottlenecks, with concrete mitigations and trade-offs. Real-time Synchronization Problems 1.1 Broadcasting only to clients on the same server Problem Each API server only broadcasts WebSocket changes to clients…
Read the full answer
GPT-6 Astra2,505 words
This design can support a collaborative-editor prototype, but its current consistency model will lose edits, its cross-server propagation will produce inconsistent views, and its persistence and caching choices create durability and security risks.
Read the full answer

Character Voice Test

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

GPT-5.5121 words
Pirate: Arrr, this AI model be like a treasure map—feed it enough scrolls, and it points ye toward answers. Knight: A curious enchantment indeed. Yet can it reason with honor, or merely mimic the bards who trained it? Hacker: Dude, it’s basically pattern recognition at massive scale.
Read the full answer
GPT-6 Astra121 words
Pirate: Arrr, this AI model writes sea shanties, plots me voyages, and never asks for a share o’ the booty! Knight: But can it be trusted? I asked it to name my ancestors, and it invented Sir Geoffrey the Surprisingly Tall. Hacker: Classic hallucination, dude. Fluent output doesn’t mean verified data.
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-5.5615 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
GPT-6 Astra459 words
A simple 1-month plan for better health Focus on food, movement, and sleep. The goal is to build habits you can sustain—not to overhaul your life in four weeks. These habits support long-term health, but no routine guarantees longevity. Week 1: Start small Food Add a fruit or vegetable to two meals each day.
Read the full answer
Our Verdict
GPT-5.5
GPT-5.5
GPT-6 Astra
GPT-6 Astra

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

GPT-5.5
Input
$5.00
2.0× cheaper
Output
$30.00
1.7× cheaper
GPT-6 Astra
Input
$10.00
Output
$50.00

GPT-5.5 is cheaper on both: 2.0× input, 1.7× output.

Where to run it

5 hosts, cheapest first

GPT-5.53 hosts
HostInOutContextUptime
Azure AI Foundry$5.00 in·$30.00 out·1.1M·99.9% upOpenAI$5.00 in·$30.00 out·1.1M·69.5% upAmazon Bedrock$5.50 in·$33.00 out·1.1M·100% up
GPT-6 Astra2 hosts
HostInOutContextUptime
Azure AI Foundry$10.00 in·$50.00 out·1.1M·98.3% upOpenAI$10.00 in·$50.00 out·1.1M·99.4% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
63%

GPT-6 Astra uses 3.6x more emoji

GPT-5.5
GPT-6 Astra
58%Vocabulary62%
18wSentence Length15w
0.74Hedging0.87
2.9Bold4.0
5.1Lists2.3
0.00Emoji0.04
1.68Headings0.77
0.03Transitions0.10
Based on 26 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Against the newest arrivals

GPT-5.5 logoGPT-6 Astra Pro logo
GPT-5.5 vs GPT-6 Astra ProLanded Sep 2026
GPT-6 Astra logoClaude Fable 5.1 logo
GPT-6 Astra vs Claude Fable 5.1Landed Sep 2026
GPT-5.5 logoMuse Spark 1.3 logo
GPT-5.5 vs Muse Spark 1.3Landed Sep 2026
GPT-6 Astra logoHy4 Preview logo
GPT-6 Astra vs Hy4 PreviewLanded Sep 2026
GPT-5.5 logoGemini 3.8 Flash logo
GPT-5.5 vs Gemini 3.8 FlashLanded Sep 2026
GPT-6 Astra logoMuse Spark 1.3 Contributor logo
GPT-6 Astra vs Muse Spark 1.3 ContributorLanded Sep 2026
GPT-5.5 logoMercury 2.5 Preview logo
GPT-5.5 vs Mercury 2.5 PreviewLanded Sep 2026
GPT-6 Astra logoGranite 4.2 8B logo
GPT-6 Astra vs Granite 4.2 8BLanded Sep 2026

Same lab, same size, long tail

GPT-5.5 logoGPT-5.6 Luna logo
GPT-5.5 vs GPT-5.6 LunaSame lab
GPT-5.5 logoGPT-5.6 Luna Pro logo
GPT-5.5 vs GPT-5.6 Luna ProSame lab
GPT-6 Astra logoGPT-6 Astra Pro logo
GPT-6 Astra vs GPT-6 Astra ProVersion compare
GPT-6 Astra logoGPT-5.6 Luna logo
GPT-6 Astra vs GPT-5.6 LunaVersion compare
GPT-5.5 logoGPT-5.1-Codex logo
GPT-5.5 vs GPT-5.1-CodexSame lab
GPT-5.5 logoGPT-5.1 Codex Max logo
GPT-5.5 vs GPT-5.1 Codex MaxSame lab
GPT-5.5 logoGPT-5.1-Codex-Mini logo
GPT-5.5 vs GPT-5.1-Codex-MiniSame lab
GPT-5.5 logoGPT-5.2 logo
GPT-5.5 vs GPT-5.2Same lab

Model pages

GPT-5.5 logo
GPT-5.558 outputs, specs and price
GPT-6 Astra logo
GPT-6 Astra58 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
  • 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