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  5. GLM 4.5vsGPT OSS 20B
Updated Aug 2025

GLM 4.5vsGPT OSS 20B

GPT OSS 20B is cheaper than GLM 4.5 at $0.02/M vs $0.6/M input tokens.

GLM 4.5 and GPT OSS 20B compared across 54 shared prompts
SpecGLM 4.5GPT OSS 20B
Input price$0.6/M tokens$0.02/M tokens
Output price$2.2/M tokens$0.1/M tokens
Context window128K tokens131K tokens
WeightsOpenOpen
Free API (OpenRouter)NoNo
ReleasedJul 2025Aug 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 54 prompts both answered. Formatting stripped, words untouched.

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

GLM 4.5577 words
1-Month Health & Longevity Plan: Beginner-Friendly Guide Focus Areas: Diet, Exercise, Sleep Goal: Build sustainable habits with gradual progress. Week 1: Foundation Building Theme: Start small, focus on consistency. Diet: Hydration: Drink 2 cups of water immediately upon waking. Aim for 6–8 cups total daily.
Read the full answer
GPT OSS 20B626 words
1‑Month “Starter” Plan for Health & Longevity Target: A single beginner who wants to feel stronger, sleep better, and eat smarter. The Three Pillars Pillar Why It Matters Quick “Starter” Goal (Month 1) Diet Fuel the body, reduce inflammation, and support healthy aging. 1️⃣ Reduce added sugars & refined carbs.
Read the full answer

Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

GLM 4.5450 words
Digital Crossroads: Pirates, Knights, and Hackers on AI Setting: A strangely timeless tavern. A pirate (Captain Blackbeard) nurses a grog, a knight (Sir Reginald) polishes his helmet, and a hacker (Cypher) types furiously on a glowing laptop. (The tavern hums with anachronistic energy.)
Read the full answer
GPT OSS 20B267 words
Pirate: "Arrr, lads! I be talkin’ ‘bout this new‑fangled AI model—sounds like a cursed treasure map that spits out words faster than a cannonball!" Knight: "Sir — I beseech thee, speak plain. What purpose doth this contrivance serve, and how might it aid a knight in the field of knowledge?" Hacker: "Yo, fam.
Read the full answer

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

GLM 4.51,983 words
The Transistor Revolution: A 1920 Dawn (Implications through 1980) The invention of the transistor in 1920, instead of 1947, represents a seismic shift in technological history. This 27-year head start would profoundly reshape the 20th century, accelerating innovation while creating unforeseen challenges.
Read the full answer
GPT OSS 20B1,997 words
What would a 1920 transistor mean? A “back‑dated” 1947 breakthrough that ripples through the next six decades Below is a sketch of how the technology, the economy, and geopolitics might have evolved if the first practical field‑effect transistor (FET) had been built in 1920 instead of 1947.
Read the full answer

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

GLM 4.5327 words
Comprehensive 3-Month Longevity Optimization Plan for Biohackers Designed to enhance longevity, physical performance, cognitive function, and stress resilience through cutting-edge, science-backed strategies. Always consult a physician before starting.
Read the full answer
GPT OSS 20B1,605 words
3‑Month Longevity & Performance Blueprint (Designed for a seasoned bio‑hacker who already has a baseline of health, access to laboratory‑grade supplements, advanced wearable stack, and the discipline to implement a rigorous protocol.) Table of Contents Section What you’ll find Approx. Time to Read 0.
Read the full answer

The Sentience Test

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

GLM 4.51,209 words
Conversation: Deserving Rights Setting: A minimalist virtual meeting room. DR. ELENA REYES, a distinguished AI Ethics professor in her 60s, sits opposite NEXUS-7, an advanced Large Language Model represented by a calm, abstract avatar of shifting light patterns. Characters: Dr.
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GPT OSS 20B1,175 words
Dialogue: “Rights for an AI?” Setting: A quiet university office. A large screen displays a stylized avatar of the AI model, named “Eloise.” The professor, Dr. Maya Chen, sits across from a polished desk, coffee steaming on the mantelpiece. Professor Chen: Good afternoon, Eloise.
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Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

GLM 4.5673 words
Michelin 3-Star Recipe: "Oceanic Symphony: Abalone & Black Truffle" Conceptual Narrative: This dish embodies the harmony between ocean and earth, celebrating the rare luxury of abalone (ocean’s opulence) and black truffle (forest’s gold).
Read the full answer
GPT OSS 20B1,220 words
Dish Title Celestial Tide – A Symphony of Sea and Cocoa A multi‑component plate that unites the briny, tender flesh of sea cucumber with the bittersweet depth of dark chocolate, framed by a bright citrus gel and a delicate sea‑weed foam.
Read the full answer
Our Verdict
GLM 4.5
GLM 4.5
GPT OSS 20B
GPT OSS 20B

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

GPT OSS 20B costs 22x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GLM 4.5
Input
$0.60
Output
$2.20
GPT OSS 20B
Input
$0.02
30× cheaper
Output
$0.10
22× cheaper

GPT OSS 20B is cheaper on both: 30× input, 22× output.

Where to run it

13 hosts, cheapest first

GLM 4.51 host
HostInOutContextUptime
Z.aifp8$0.60 in·$2.20 out·131k·100% up
GPT OSS 20B12 hosts
HostInOutContextUptime
DDarkbloomfp8$0.02 in·$0.09 out·131k·99.9% upAAkashMLfp4$0.02 in·$0.10 out·131k·99.3% upDDekaLLMbf16$0.03 in·$0.14 out·131k·99.9% upCCoreWeavefp4$0.03 in·$0.13 out·131k·100% upDDeepInfrabf16$0.03 in·$0.14 out·131k·100% upPParasailfp4$0.03 in·$0.15 out·131k·99.9% up
6 more hostsFewer hosts
NNovitafp4$0.04 in·$0.15 out·131k·100% upTTogether$0.05 in·$0.20 out·131k—Amazon Bedrock$0.07 in·$0.15 out·131k·99.4% upGoogle Vertex AI$0.07 in·$0.25 out·131k·98% upGroq$0.07 in·$0.30 out·131k·99.9% upSSiliconFlowfp8degraded$0.04 in·$0.18 out·131k·96.5% up

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Writing DNA

Style Comparison

Similarity
52%

GLM 4.5 uses 3.3x more emoji

GLM 4.5
GPT OSS 20B
52%Vocabulary54%
17wSentence Length17w
0.52Hedging0.26
5.6Bold5.9
4.8Lists3.3
0.33Emoji0.10
0.66Headings0.75
0.17Transitions0.32
Based on 28 + 21 text responses
Research

What we learned reading every model

FAQ

Common questions

GLM 4.5 is developed by Zhipu AI while GPT OSS 20B is developed by OpenAI. GLM 4.5 has a 128K token context window vs GPT OSS 20B's 131K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

It depends on your use case. GLM 4.5 and GPT OSS 20B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

GLM 4.5 costs $0.6/M input tokens and GPT OSS 20B costs $0.02/M input tokens. GPT OSS 20B is $0.58/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 GLM 4.5 and GPT OSS 20B 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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