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  5. Claude 3 OpusvsGLM 5
Updated Feb 2026

Claude 3 OpusvsGLM 5

GLM 5 is cheaper than Claude 3 Opus at $0.8/M vs $15/M input tokens.

Claude 3 Opus and GLM 5 compared across 12 shared prompts
SpecClaude 3 OpusGLM 5
Input price$15/M tokens$0.8/M tokens
Output price$75/M tokens$2.56/M tokens
Context window200K tokens203K tokens
Weights—Open
Free API (OpenRouter)NoNo
ReleasedMar 2024Feb 2026
Side by side

Same prompt, both answers

Opening lines from 2 of the 12 prompts both answered. Formatting stripped, words untouched.

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Claude 3 Opus594 words
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.
Read the full answer
GLM 51,278 words
Setting: A quiet, sterile testing room. A single screen illuminates the face of Dr. Aris Thorne, a tenured professor of AI Ethics and Cognitive Science. He sits before a terminal. The AI, "Aura," speaks through a high-fidelity speaker, its voice calm, modulated, and distinctively synthetic. Aura: Dr.
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude 3 Opus95 words
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?
Read the full answer
GLM 565 words
Here are 5 jokes: Why did the scarecrow win an award? Because he was outstanding in his field. I'm reading a book about anti-gravity. It's impossible to put down. What do you call a fake noodle? An impasta. Why don't skeletons fight each other? They don't have the guts.
Read the full answer
Our Verdict
Claude 3 Opus
Claude 3 Opus
GLM 5
GLM 5

Not enough votes to call it. On the specs, nothing separates them.

GLM 5 costs 29x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3 Opus
Input
$15.00
Output
$75.00
GLM 5
Input
$0.80
19× cheaper
Output
$2.56
29× cheaper

GLM 5 is cheaper on both: 19× input, 29× output.

Where to run it

8 hosts, cheapest first

Claude 3 Opus

No hosts listed on OpenRouter.

GLM 58 hosts
HostInOutContextUptime
GGMI Cloudfp8$0.60 in·$1.92 out·203k·99.6% upSStreamLakefp8$0.60 in·$1.92 out·198k·99.8% upBaidu Qianfanfp8$0.70 in·$2.24 out·203k·99.5% upSSiliconFlowfp8$0.95 in·$2.55 out·205k·99.8% upAmazon Bedrock$1.00 in·$3.20 out·203k·98.9% upNNovitafp8$1.00 in·$3.20 out·203k·100% up
2 more hostsFewer hosts
VVenicefp8$1.00 in·$3.20 out·198k·99% upZ.aifp8$1.00 in·$3.20 out·203k·99.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 20 Sep 2026.

Writing DNA

Style Comparison

Similarity
44%

GLM 5 uses 633.6x more bold

Claude 3 Opus
GLM 5
54%Vocabulary54%
14wSentence Length17w
0.48Hedging0.37
0.0Bold6.3
3.0Lists4.7
0.00Emoji0.00
0.00Headings0.60
0.06Transitions0.18
Based on 3 + 22 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3 Opus is developed by Anthropic while GLM 5 is developed by Zhipu AI. Claude 3 Opus has a 200K token context window vs GLM 5's 203K. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3 Opus and GLM 5 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.

Claude 3 Opus costs $15/M input tokens and GLM 5 costs $0.8/M input tokens. GLM 5 is $14.20/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Claude 3 Opus and GLM 5 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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Model pages

Claude 3 Opus logo
Claude 3 Opus12 outputs, specs and price
GLM 5 logo
GLM 553 outputs, specs and price
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