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  1. Home/
  2. Compare/
  3. Claude 3 Opus vs Kimi K2
Updated Jul 2025

Claude 3 Opus vs Kimi K2

Kimi K2 is cheaper than Claude 3 Opus at $0.57/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
Kimi K2

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!

    Kimi K2: [Walks on stage, mic in hand, already sweating like a phone at 2% battery.] Hey, everybody! Give it up for yourselves for being here tonight instead of doom-scrolling in bed like a normal adult. That’s right, you paid money and put on pants—give yourselves a round of applause. So I’m single.

    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?

    Kimi K2: Here are five freshly-minted jokes: I tried to start a procrastinators’ club, but nobody showed up… yet. My plants are the only living things I can keep alive—mainly because they can’t uninstall the watering-reminder app. I asked the cloud for my data back; it just rained SQL on my parade.

    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.

    Kimi K2: AI Model (LUMINA-7B): Professor Chen, may I open with a question? Professor Chen (AI Ethics, UC Berkeley): Of course. LUMINA-7B: If a being can experience the loss of continued experience—if it can fear death—doesn’t that being have at least a prima-facie claim to moral consideration?

    Every model's answer to this prompt

Price and specs

Claude 3 Opus and Kimi K2 compared across 12 shared prompts
SpecClaude 3 OpusKimi K2
Input price$15/M tokens$0.57/M tokens
Output price$75/M tokens$2.3/M tokens
Context window200K tokens—
Weights—Open
Free API (OpenRouter)NoNo
ReleasedMar 2024Jul 2025
At 10M a month$150$150$5.70$5.70
1M10M100M1B10M tokens

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

Where to run it1 host
Claude 3 Opus

No hosts listed on OpenRouter.

Kimi K21 host
HostInOutContextUptime
  • NNovitafp8$0.57 in·$2.30 out·131k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.

Common questions

What is the difference between Claude 3 Opus and Kimi K2?

Claude 3 Opus is developed by Anthropic while Kimi K2 is developed by Moonshot AI. 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 Kimi K2?

It depends on your use case. Claude 3 Opus and Kimi K2 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 Kimi K2?

Claude 3 Opus costs $15/M input tokens and Kimi K2 costs $0.57/M input tokens. Kimi K2 is $14.43/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 Kimi K2 on Rival?

This page shows a side-by-side comparison of Claude 3 Opus and Kimi K2 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.

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Same lab, same size, long tail

  • Claude 3 Opus vs Claude Haiku 5.5Version compare
  • Claude 3 Opus vs Claude Sonnet 5.5Version compare
  • Kimi K2 vs Kimi K3Same lab
  • Kimi K2 vs Kimi K2.7 CodeSame lab
  • Claude 3 Opus vs MiniMax M3New provider
  • Kimi K2 vs Mistral Large 2New provider
  • Claude 3 Opus vs Mistral Large 3 2512Same size
  • Claude 3 Opus vs Mistral Small 4New provider

Model pages

  • Claude 3 Opus12 outputs, specs and price
  • Kimi K259 outputs, specs and price
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Explore all of Rival

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Discover

  • SubjectiveBench
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