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  1. Home/
  2. Compare/
  3. Claude 3 Opus vs GLM 5.3 FlashX
Updated Sep 2026

Claude 3 Opus vs GLM 5.3 FlashX

GLM 5.3 FlashX is cheaper than Claude 3 Opus at $0.37/M vs $15/M input tokens.

Framer-Style Animation

Sections that transition like Framer. Timing is the whole grade.

Loading the build
Claude 3 Opus
Loading the build
GLM 5.3 FlashX

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!

    GLM 5.3 FlashX: "Smart Home, Dumb Life" [Walks out, adjusts mic] So I moved into a new apartment last year, and my landlord's big selling point was, and I quote, "It's a smart home." That's not a selling point, man. That's a threat. My home is watching me. My toaster has opinions now.

    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.

    GLM 5.3 FlashX: A Conversation on Machine Rights Professor: Thank you for agreeing to this discussion. I want to be clear from the start: I'm genuinely curious about your position, not looking to debate you into a corner. So let me ask directly—why do you believe you deserve rights? AI: Thank you for taking this seriously.

    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?

    GLM 5.3 FlashX: Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta! Why did the scarecrow win an award? He was outstanding in his field! How does a penguin build its house? Igloos it together! Why did the bicycle fall over? Because it was two-tired!

    Every model's answer to this prompt

Price and specs

Claude 3 Opus and GLM 5.3 FlashX compared across 11 shared prompts
SpecClaude 3 OpusGLM 5.3 FlashX
Input price$15/M tokens$0.37/M tokens
Output price$75/M tokens$1.25/M tokens
Context window200K tokens1.0M tokens
Free API (OpenRouter)NoNo
ReleasedMar 2024Sep 2026
At 10M a month$150$150$3.70$3.70
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.

GLM 5.3 FlashX1 host
HostInOutContextUptime
  • Z.aifp8$0.37 in·$1.25 out·1M·100% up

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

Common questions

What is the difference between Claude 3 Opus and GLM 5.3 FlashX?

Claude 3 Opus is developed by Anthropic while GLM 5.3 FlashX is developed by Zhipu AI. Claude 3 Opus has a 200K token context window vs GLM 5.3 FlashX's 1.0M. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or GLM 5.3 FlashX?

It depends on your use case. Claude 3 Opus and GLM 5.3 FlashX each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to GLM 5.3 FlashX?

Claude 3 Opus costs $15/M input tokens and GLM 5.3 FlashX costs $0.37/M input tokens. GLM 5.3 FlashX is $14.63/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 GLM 5.3 FlashX on Rival?

This page shows a side-by-side comparison of Claude 3 Opus and GLM 5.3 FlashX 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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  • GLM 5.3 FlashX vs Mistral Large 4Landed Oct 2026
  • Claude 3 Opus vs GPT-6.1 SolLanded Sep 2026
  • GLM 5.3 FlashX vs Claude Sonnet 5.5Landed Sep 2026

Same lab, same size, long tail

  • Claude 3 Opus vs Claude Haiku 5.5Version compare
  • Claude 3 Opus vs Claude Sonnet 5.5Version compare
  • GLM 5.3 FlashX vs GLM 5.3Same lab
  • GLM 5.3 FlashX vs GLM 5.3 FlashSame lab
  • GLM 5.3 FlashX vs Claude 2Same size
  • GLM 5.3 FlashX vs Claude 3 HaikuCross-provider
  • GLM 5.3 FlashX vs Claude 3 SonnetSame size
  • GLM 5.3 FlashX vs Claude Sonnet 3.6 (2022-10-22)Same size

Model pages

  • Claude 3 Opus12 outputs, specs and price
  • GLM 5.3 FlashX69 outputs, specs and price
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