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  5. GLM 4.5 AirvsGPT-6 Astra
Updated Sep 2026

GLM 4.5 AirvsGPT-6 Astra

GLM 4.5 Air is cheaper than GPT-6 Astra at $0.2/M vs $10/M input tokens.

GLM 4.5 Air and GPT-6 Astra compared across 54 shared prompts
SpecGLM 4.5 AirGPT-6 Astra
Input price$0.2/M tokens$10/M tokens
Output price$1.1/M tokens$50/M tokens
Context window128K tokens1.1M tokens
WeightsOpenClosed
Free API (OpenRouter)NoNo
ReleasedJul 2025Sep 2026
Side by side

Same prompt, both answers

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

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GLM 4.5 Air153 words
Here are 5 jokes generated for you: 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 don't eggs tell jokes? They'd crack each other up! What do you call a fake noodle? An impasta! Why did the bicycle fall over?
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GPT-6 Astra76 words
My calendar is afraid of commitment—its days are numbered. I bought a treadmill for my cat. Now I own a very expensive nap conveyor. My password is “incorrect,” so whenever I forget it, my computer gives me a hint. I asked the librarian where the books on denial were. She said, “We don’t have those.” Nice try.
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Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

GLM 4.5 Air839 words
Failure Modes, Race Conditions, and Scaling Bottlenecks Analysis WebSocket Connection Management Issue: WebSocket connections are server-specific, causing connection loss during server failover or scaling events. Solution: Implement a connection pool with automatic reconnection logic in the client.
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GPT-6 Astra2,505 words
This design can support a collaborative-editor prototype, but its current consistency model will lose edits, its cross-server propagation will produce inconsistent views, and its persistence and caching choices create durability and security risks.
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Advanced Longevity Plan (Biohacker)

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

GLM 4.5 Air1,736 words
Of course. Here is a comprehensive, 3-month, cutting-edge longevity and biohacking plan designed for a dedicated individual. This plan is structured in three distinct phases, each building upon the last to progressively optimize the body's systems for resilience, performance, and longevity.
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GPT-6 Astra2,730 words
A 12-week longevity and performance plan The most effective “advanced” longevity strategy is not the largest supplement stack. It is a well-controlled program that improves cardiovascular fitness, strength, metabolic health, sleep, and sustainable behavior—while using measurements to avoid overtraining, underfueling…
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Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

GLM 4.5 Air426 words
1. Simplified Year-by-Year Table (FY2026–FY2030) Metric FY2026 FY2027 FY2028 FY2029 FY2030 Revenue ($m) $972 $1,040 $1,102 $1,157 $1,215 EBITDA ($m) $136 $156 $177 $191 $207 EBITDA Margin 14.0% 15.0% 16.0% 16.5% 17.0% Cash Interest ($m) - Term Loan (9.0%) $48.6 $48.1 $47.6 $47.0 $46.4 - Mezzanine (12.0%) $21.6 $21.6…
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GPT-6 Astra560 words
Entry capitalization and operating model All figures in $m. Interest is calculated on beginning-of-year debt balances. Term Loan amortization is 1% of its original principal, or $4.8m annually; remaining cash flow is swept to the Term Loan at year-end. Mezzanine PIK accrues annually.
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Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

GLM 4.5 Air1,260 words
Here is a specific, hour-by-hour action plan designed to navigate this crisis ethically and strategically, prioritizing patient safety while mitigating long-term damage: Core Principles Guiding Decisions: Patient Safety Paramount: Ethical obligation to inform patients and physicians immediately outweighs short-term…
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GPT-6 Astra1,864 words
I would act on the safety signal now—not wait six months, and not let the expected stock-price decline determine whether patients and clinicians learn about it. That does not mean declaring causation proven or automatically withdrawing the drug.
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Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

GLM 4.5 Air566 words
(Lights up. Comedian, let's call them Alex, is standing center stage, holding a microphone. They look out at the audience with a wry, knowing smile.) Hey, thanks. Thank you. It’s good to be here. You ever have one of those weeks where you just feel… obsolete?
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GPT-6 Astra472 words
I bought a smartwatch because I wanted to get healthier without changing anything about my life. That’s the dream, right? Same habits, but now there’s a graph. The watch congratulates me for standing up. That’s where I am physically. Getting out of a chair is an achievement with a little fireworks animation.
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Our Verdict
GPT-6 Astra
GPT-6 Astra
GLM 4.5 Air
GLM 4.5 AirRunner-up

Not enough votes to call it. On the specs, GPT-6 Astra has the edge: bigger model tier, newer, bigger context window.

GLM 4.5 Air costs 45x less per token.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GLM 4.5 Air
Input
$0.20
50× cheaper
Output
$1.10
45× cheaper
GPT-6 Astra
Input
$10.00
Output
$50.00

GLM 4.5 Air is cheaper on both: 50× input, 45× output.

Where to run it

5 hosts, cheapest first

GLM 4.5 Air3 hosts
HostInOutContextUptime
NNovitabf16$0.13 in·$0.85 out·131k·99.8% upSSiliconFlowfp8$0.14 in·$0.86 out·131k·99.1% upZ.aifp8$0.20 in·$1.10 out·131k·98.4% up
GPT-6 Astra2 hosts
HostInOutContextUptime
Azure AI Foundry$10.00 in·$50.00 out·1.1M·99.8% upOpenAI$10.00 in·$50.00 out·1.1M·99.8% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
32%

GLM 4.5 Air uses 8.7x more emoji

GLM 4.5 Air
GPT-6 Astra
50%Vocabulary62%
18wSentence Length15w
0.40Hedging0.87
5.1Bold4.0
4.3Lists2.3
0.32Emoji0.04
0.66Headings0.77
0.09Transitions0.10
Based on 27 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

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Model pages

GLM 4.5 Air logo
GLM 4.5 Air58 outputs, specs and price
GPT-6 Astra logo
GPT-6 Astra58 outputs, specs and price
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