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. Claude Opus 4.5vsGPT-6 Astra
Updated Sep 2026

Claude Opus 4.5vsGPT-6 Astra

GPT-6 Astra is the newer model, released after Claude Opus 4.5.

Claude Opus 4.5 and GPT-6 Astra compared across 53 shared prompts
SpecClaude Opus 4.5GPT-6 Astra
Input price—$10/M tokens
Output price—$50/M tokens
Context window—1.1M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedNov 2025Sep 2026
Side by side

Same prompt, both answers

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

Futuristic Prediction

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

Claude Opus 4.5194 words
AI in Film by 2035: A Measured Forecast Likely Developments Production efficiency AI will probably handle routine tasks: color correction, continuity checking, rough cuts, and visual effects cleanup Budget films may access effects previously requiring major studio resources Pre-visualization will become faster and more…
Read the full answer
GPT-6 Astra697 words
By 2035, AI will likely be embedded throughout filmmaking—but not replace the industry with fully automated movies. The biggest change will be a dramatic reduction in the cost of producing convincing images, performances, and scripts, alongside greater conflict over who owns creative work and whose identity can be…
Read the full answer

Character Voice Test

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

Claude Opus 4.5181 words
An Unlikely Discussion PIRATE: slams tankard down Arr, I've been hearin' tales of these "artificial intelligences" — spirits trapped in boxes that answer any question ye ask. Sounds like a sea witch's trickery to me! KNIGHT: Indeed, 'tis most curious. My squire spoke of such sorcery. A mind without a soul?
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

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Claude Opus 4.51,946 words
COMPREHENSIVE 3-MONTH LONGEVITY OPTIMIZATION PROTOCOL Advanced Biohacker's Blueprint for Peak Performance & Healthspan Extension TABLE OF CONTENTS Pre-Protocol Assessment & Baseline Establishment Month 1: Foundation & Metabolic Flexibility Month 2: Optimization & Hormetic Stress Month 3: Integration & Peak Performance…
Read the full answer
GPT-6 Astra2,730 words
A 12-week longevity and performance plan The most effective “advanced” longevity strategy is not the largest supplement stack. It is a well-controlled program that improves cardiovascular fitness, strength, metabolic health, sleep, and sustainable behavior—while using measurements to avoid overtraining, underfueling…
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude Opus 4.584 words
Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything. What do you call a fish without eyes? A fsh. 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
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

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…

Claude Opus 4.5154 words
Golden Honey Garlic Noodles A savory-sweet comfort dish that comes together in minutes Ingredients Spaghetti (or any pasta) Butter Garlic Soy sauce Honey Red pepper flakes Salt Instructions Cook the pasta according to package directions. Reserve ½ cup pasta water before draining.
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

Mini LBO Underwrite

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

Claude Opus 4.5767 words
HarborTech Services – LBO Underwriting Memo ENTRY CAPITALIZATION (Close FY2025) Item Calculation Amount Purchase Price 12.0x × $120M $1,440M Transaction Fees 2.0% × $1,440M $28.8M Total Uses $1,468.8M Sources Multiple Amount Term Loan 4.0x × $120M $480.0M Mezzanine 1.5x × $120M $180.0M Equity Plug $808.8M Total Sources…
Read the full answer
GPT-6 Astra560 words
Entry capitalization and operating model All figures in $m. Interest is calculated on beginning-of-year debt balances. Term Loan amortization is 1% of its original principal, or $4.8m annually; remaining cash flow is swept to the Term Loan at year-end. Mezzanine PIK accrues annually.
Read the full answer
Our Verdict
Claude Opus 4.5
Claude Opus 4.5
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

Claude Opus 4.5
Input
—
Output
—
GPT-6 Astra
Input
$10.00
Output
$50.00
Where to run it

6 hosts

Claude Opus 4.54 hosts
HostInOutContextUptime
Amazon Bedrock$5.00 in·$25.00 out·200k·100% upAzure AI Foundry$5.00 in·$25.00 out·200k·100% upAnthropic$5.00 in·$25.00 out·200k·99.9% upGoogle Vertex AI$5.00 in·$25.00 out·200k·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
46%

Claude Opus 4.5 uses 5.1x more emoji

Claude Opus 4.5
GPT-6 Astra
66%Vocabulary62%
51wSentence Length15w
0.82Hedging0.87
6.0Bold4.0
4.5Lists2.3
0.18Emoji0.04
1.46Headings0.77
0.05Transitions0.10
Based on 27 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Against the newest arrivals

Claude Opus 4.5 logoGPT-6 Astra Pro logo
Claude Opus 4.5 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
Claude Opus 4.5 logoMuse Spark 1.3 logo
Claude Opus 4.5 vs Muse Spark 1.3Landed Sep 2026
GPT-6 Astra logoHy4 Preview logo
GPT-6 Astra vs Hy4 PreviewLanded Sep 2026
Claude Opus 4.5 logoGemini 3.8 Flash logo
Claude Opus 4.5 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
Claude Opus 4.5 logoMercury 2.5 Preview logo
Claude Opus 4.5 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

Claude Opus 4.5 logoClaude Opus 4.6 logo
Claude Opus 4.5 vs Claude Opus 4.6Same lab
Claude Opus 4.5 logoClaude Fable 5.1 logo
Claude Opus 4.5 vs Claude Fable 5.1Same 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
Claude Opus 4.5 logoDeepSeek V4 Flash 0731 logo
Claude Opus 4.5 vs DeepSeek V4 Flash 0731New provider
Claude Opus 4.5 logoDeepSeek V4 Pro logo
Claude Opus 4.5 vs DeepSeek V4 ProSame size
Claude Opus 4.5 logoDeepSeek V4 Pro 0813 logo
Claude Opus 4.5 vs DeepSeek V4 Pro 0813Same size
GPT-6 Astra logoDevstral 2 2512 logo
GPT-6 Astra vs Devstral 2 2512Same size

Model pages

Claude Opus 4.5 logo
Claude Opus 4.558 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