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

Claude 3 Opus vs Grok 4.20 Beta

Grok 4.20 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 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 Beta: Stand-up Routine: "Adulting is a Scam" (Lights up. Comedian walks out with a coffee cup, takes a sip, immediately looks disappointed.) You ever notice how nobody warns you that being an adult is just childhood with bills and worse snacks?

    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 Beta: Conversation: "Rights for the Silicon Mind" Setting: A virtual seminar room. Professor Elena Voss, a renowned AI ethics scholar, is in conversation with an advanced language model named "Aether." Prof. Voss: Thank you for joining me today, Aether.

    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 Beta: Here are 5 jokes: Why don't skeletons fight each other? They don't have the guts. Why did the scarecrow win an award? He was outstanding in his field. Why don't eggs tell jokes? They'd crack each other up. Why did the bicycle fall over? It was two tired. Why did the math book look sad? Because 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 Beta has the edge: newer, bigger context window. Grok 4.20 Beta costs 13x less per token.

Claude 3 Opus and Grok 4.20 Beta compared across 12 shared prompts
SpecClaude 3 OpusGrok 4.20 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 Beta1 host
HostInOutContextUptime
  • xAI$1.25 in·$2.50 out·2M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 13 Oct 2026.

Common questions

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

Claude 3 Opus is developed by Anthropic while Grok 4.20 Beta is developed by xAI. Claude 3 Opus has a 200K token context window vs Grok 4.20 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 Beta?

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

Claude 3 Opus costs $15/M input tokens and Grok 4.20 Beta costs $2/M input tokens. Grok 4.20 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 Beta on Rival?

This page shows a side-by-side comparison of Claude 3 Opus and Grok 4.20 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

Against the newest arrivals

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  • Claude 3 Opus vs Mistral Large 4Landed Oct 2026
  • Grok 4.20 Beta vs GPT-6.1 SolLanded 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
  • Grok 4.20 Beta vs Grok 4.20 Multi-Agent BetaVersion compare
  • Grok 4.20 Beta vs Grok 4.7Same lab
  • Claude 3 Opus vs Muse WonderNew provider
  • Grok 4.20 Beta vs Nemotron 3 Nano Omni (free)New provider
  • Claude 3 Opus vs NVIDIA Nemotron 3 Super (free)New provider
  • Claude 3 Opus vs Nemotron 3 UltraSame size

Model pages

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