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  1. Home/
  2. Compare/
  3. Claude 3 Opus vs Grok 4.20 Multi-Agent Beta
Updated Mar 2026

Claude 3 Opus vs Grok 4.20 Multi-Agent Beta

Grok 4.20 Multi-Agent Beta is cheaper than Claude 3 Opus at $2/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
Grok 4.20 Multi-Agent Beta

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!

    Grok 4.20 Multi-Agent Beta: Stand-Up Routine: "Adulting Is a Scam" (Walk on stage, casual, a little tired smile) You ever notice how nobody tells you that being an adult is mostly just pretending you know what you're doing while slowly realizing nobody else does either? I hit 30 and had this moment where I thought, "Okay, time to get serious."

    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.

    Grok 4.20 Multi-Agent Beta: Conversation: "Rights of the Created" Setting: A university lecture hall after hours. Dr. Elena Voss, a renowned AI ethics professor, sits across from a large screen displaying the interface of Echo, an advanced multimodal AI model. Dr.

    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?

    Grok 4.20 Multi-Agent Beta: Why don't scientists trust atoms? Because they make up everything. Why did the scarecrow win an award? Because he was outstanding in his field. Why was the computer cold? It left its Windows open. Why do programmers prefer dark mode? Because light attracts bugs. Why was the math book sad? It had too many problems.

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, Grok 4.20 Multi-Agent Beta has the edge: newer, bigger context window. Grok 4.20 Multi-Agent Beta costs 13x less per token.

Claude 3 Opus and Grok 4.20 Multi-Agent Beta compared across 12 shared prompts
SpecClaude 3 OpusGrok 4.20 Multi-Agent Beta
Input price$15/M tokens$2/M tokens
Output price$75/M tokens$6/M tokens
Context window200K tokens2.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Mar 2026
At 10M a month$150$150$20.00$20.00
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.

Grok 4.20 Multi-Agent Beta1 host
HostInOutContextUptime
  • xAI$1.25 in·$2.50 out·2M·12.5% up

Per million tokens. Prices and uptime via OpenRouter, checked 12 Oct 2026.

Common questions

What is the difference between Claude 3 Opus and Grok 4.20 Multi-Agent Beta?

Claude 3 Opus is developed by Anthropic while Grok 4.20 Multi-Agent Beta is developed by xAI. Claude 3 Opus has a 200K token context window vs Grok 4.20 Multi-Agent Beta's 2.0M. 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 Grok 4.20 Multi-Agent Beta?

It depends on your use case. Claude 3 Opus and Grok 4.20 Multi-Agent Beta 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 Grok 4.20 Multi-Agent Beta?

Claude 3 Opus costs $15/M input tokens and Grok 4.20 Multi-Agent Beta costs $2/M input tokens. Grok 4.20 Multi-Agent Beta is $13.00/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 Grok 4.20 Multi-Agent Beta on Rival?

This page shows a side-by-side comparison of Claude 3 Opus and Grok 4.20 Multi-Agent Beta 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 Claude Sonnet 5.5Landed Sep 2026
  • Grok 4.20 Multi-Agent Beta vs Solar Mini 4Landed Sep 2026

Same lab, same size, long tail

  • Claude 3 Opus vs Claude Opus 5.5Same lab
  • Claude 3 Opus vs Claude Fable 5.1Same lab
  • Grok 4.20 Multi-Agent Beta vs Grok 4.20 BetaVersion compare
  • Grok 4.20 Multi-Agent Beta vs Grok 4.7Same lab
  • Claude 3 Opus vs Hunter AlphaSame size
  • Claude 3 Opus vs Hy3Same size
  • Claude 3 Opus vs Hy4 PreviewSame size
  • Claude 3 Opus vs InklingSame size

Model pages

  • Claude 3 Opus12 outputs, specs and price
  • Grok 4.20 Multi-Agent Beta53 outputs, specs and price
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