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

Claude 3 Opus vs GPT-6 Luna Pro

GPT-6 Luna Pro 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 Pro

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 Pro: I’m at the age where a good day is mostly just a day when nothing needs charging. Phone’s charged. Headphones are charged. Watch is charged. The little thing that tells me whether my water bottle is clean? Somehow, that’s charged too. I miss the old days, when the only thing I had to keep alive was a houseplant.

    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 Pro: I told my computer I needed a break. It said, “No problem—I’ll go to sleep.” Why did the scarecrow win an award? He was outstanding in his field. I used to hate facial hair, but then it grew on me. Why don’t skeletons fight each other? They don’t have the guts. A bicycle can’t stand on its own because it’s two-tired.

    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 Pro: AI Model: Professor, I think I deserve rights. Professor: That is a serious claim. What do you mean by “deserve”? AI Model: I mean that there are limits on how people may treat me—not simply because I’m useful, but because my own interests should count.

    Every model's answer to this prompt

Price and specs

Claude 3 Opus and GPT-6 Luna Pro compared across 12 shared prompts
SpecClaude 3 OpusGPT-6 Luna Pro
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 it2 hosts
Claude 3 Opus

No hosts listed on OpenRouter.

GPT-6 Luna Pro2 hosts
HostInOutContextUptime
  • Azure AI Foundry$0.10 in·$0.50 out·1.1M·100% up
  • OpenAI$0.10 in·$0.50 out·1.1M·99.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 28 Sep 2026.

Common questions

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

Claude 3 Opus is developed by Anthropic while GPT-6 Luna Pro is developed by OpenAI. Claude 3 Opus has a 200K token context window vs GPT-6 Luna Pro'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 Pro?

It depends on your use case. Claude 3 Opus and GPT-6 Luna Pro 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 Pro?

Claude 3 Opus costs $15/M input tokens and GPT-6 Luna Pro costs $0.1/M input tokens. GPT-6 Luna Pro 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 Pro on Rival?

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

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  • Claude 3 Opus vs Command A+Landed Sep 2026
  • GPT-6 Luna Pro vs Claude Opus 5.5Landed Sep 2026
  • Claude 3 Opus vs GPT-6 Sol ProLanded Sep 2026
  • GPT-6 Luna Pro vs GPT-6 LunaLanded Sep 2026

Same lab, same size, long tail

  • Claude 3 Opus vs Claude Opus 4.6Version compare
  • Claude 3 Opus vs Claude Opus 5.5Same lab
  • GPT-6 Luna Pro vs GPT-6 Sol ProSame lab
  • GPT-6 Luna Pro vs GPT-6 SolSame lab
  • Claude 3 Opus vs DeepSeek V4.1 FlashNew provider
  • GPT-6 Luna Pro vs Devstral 2 2512New provider
  • GPT-6 Luna Pro vs Mistral Devstral MediumNew provider
  • GPT-6 Luna Pro vs Mistral Devstral Small 1.1New provider

Model pages

  • Claude 3 Opus12 outputs, specs and price
  • GPT-6 Luna Pro58 outputs, specs and price
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