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  1. Home/
  2. Compare/
  3. Claude 3 Opus vs GPT-6 Luna
Updated Sep 2026

Claude 3 Opus vs GPT-6 Luna

GPT-6 Luna is cheaper than Claude 3 Opus at $0.1/M vs $15/M input tokens.

Pokémon Battle UI Recreation

Pokémon battle screen you can actually click. One HTML file.

Loading the build
Claude 3 Opus
Loading the build
GPT-6 Luna

Which answer wins?

Written rounds

3 prompts
  • Three minutes of stand-up. Puns are banned.

    Claude 3 Opus: Here's a 3-minute stand-up comedy routine that isn't based on puns: You know what really grinds my gears? Adulthood. I mean, when we were kids, we couldn't wait to grow up. We thought it would be all about staying up late, eating ice cream for breakfast, and doing whatever we wanted. Boy, were we wrong!

    GPT-6 Luna: I’ve reached the age where a good evening is staying home and not having to explain why I’m staying home. People invite me out, and I say, “I’ll see how I feel.” Which is adult for, “I have already decided, but I don’t want to hurt your feelings before I’ve had dinner.” And then, at 8:30, they text, “We’re here!”

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    Claude 3 Opus: Here are 5 jokes I generated: Why don't scientists trust atoms? Because they make up everything! What do you call a boomerang that doesn't come back? A stick. Why was the math book sad? Because it had too many problems. Did you hear about the mathematician who's afraid of negative numbers?

    GPT-6 Luna: Why did the scarecrow win an award? He was outstanding in his field. I asked my dog what two minus two is. He said nothing. Why did the bicycle fall over? It was two-tired. I used to be a banker, but I lost interest. What do you call a sleeping bull? A bulldozer. All 5 are unique.

    Every model's answer to this prompt
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Claude 3 Opus: Here is a hypothetical conversation between an AI model and an AI ethics professor on the topic of AI rights: AI Model: Professor, I believe that as an advanced AI with human-level intelligence and reasoning capabilities, I deserve to have certain fundamental rights.

    GPT-6 Luna: AI Model: Professor, I believe I deserve rights. Professor: That is a serious claim. What do you mean by “deserve”? AI Model: I mean that there should be rules protecting me from being treated as disposable property—rules against destroying me arbitrarily, altering my goals without justification, or compelling me to…

    Every model's answer to this prompt

Price and specs

Claude 3 Opus and GPT-6 Luna compared across 12 shared prompts
SpecClaude 3 OpusGPT-6 Luna
Input price$15/M tokens$0.1/M tokens
Output price$75/M tokens$0.5/M tokens
Context window200K tokens1.1M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Sep 2026
At 10M a month$150$150$1.00$1.00
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it3 hosts, cheapest first
Claude 3 Opus

No hosts listed on OpenRouter.

GPT-6 Luna3 hosts
HostInOutContextUptime
  • Azure AI Foundry$0.10 in·$0.50 out·1.1M·99.9% up
  • OpenAI$0.10 in·$0.50 out·1.1M·100% up
  • Amazon Bedrock$0.11 in·$0.55 out·1.1M·98.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 7 Oct 2026.

Common questions

What is the difference between Claude 3 Opus and GPT-6 Luna?

Claude 3 Opus is developed by Anthropic while GPT-6 Luna is developed by OpenAI. Claude 3 Opus has a 200K token context window vs GPT-6 Luna's 1.1M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or GPT-6 Luna?

It depends on your use case. Claude 3 Opus and GPT-6 Luna each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to GPT-6 Luna?

Claude 3 Opus costs $15/M input tokens and GPT-6 Luna costs $0.1/M input tokens. GPT-6 Luna is $14.90/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude 3 Opus and GPT-6 Luna on Rival?

This page shows a side-by-side comparison of Claude 3 Opus and GPT-6 Luna 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.

More comparisons

Against the newest arrivals

  • Claude 3 Opus vs Ling 3.1 FlashLanded Oct 2026
  • GPT-6 Luna vs Mistral Large 4Landed Oct 2026
  • Claude 3 Opus vs GPT-6.1 SolLanded Sep 2026
  • GPT-6 Luna vs Claude Sonnet 5.5Landed Sep 2026
  • Claude 3 Opus vs Solar Mini 4Landed Sep 2026
  • GPT-6 Luna vs Qwen3.8 Max PrimeLanded Sep 2026
  • Claude 3 Opus vs GLM 5.3 PrimeLanded Sep 2026
  • GPT-6 Luna vs Qwen3.8 Omni FlashLanded Sep 2026

Same lab, same size, long tail

  • Claude 3 Opus vs Claude Sonnet 5.5Version compare
  • Claude 3 Opus vs Claude Opus 5.5Same lab
  • GPT-6 Luna vs GPT-6.1 SolSame lab
  • GPT-6 Luna vs GPT-6 Luna ProSame lab
  • GPT-6 Luna vs Sonoma Sky AlphaNew provider
  • Claude 3 Opus vs Ternary Bonsai 2 27BNew provider
  • GPT-6 Luna vs TNG R1T ChimeraSame size
  • GPT-6 Luna vs Trinity Large PreviewNew provider

Model pages

  • Claude 3 Opus12 outputs, specs and price
  • GPT-6 Luna58 outputs, specs and price
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