What is the difference between GLM 4.5 Air and GPT-6 Astra Pro?

GLM 4.5 Air is developed by Zhipu AI while GPT-6 Astra Pro is developed by OpenAI. GLM 4.5 Air has a 128K token context window vs GPT-6 Astra Pro's 1.1M. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, GLM 4.5 Air or GPT-6 Astra Pro?

It depends on your use case. GLM 4.5 Air and GPT-6 Astra Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 6 challenges so you can judge which fits your needs best.

How much does GLM 4.5 Air cost compared to GPT-6 Astra Pro?

GLM 4.5 Air costs $0.2/M input tokens and GPT-6 Astra Pro costs $10/M input tokens. GLM 4.5 Air is $9.80/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 GLM 4.5 Air and GPT-6 Astra Pro on Rival?

This page shows a side-by-side comparison of GLM 4.5 Air and GPT-6 Astra Pro 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.

Updated Sep 2026

GLM 4.5 AirvsGPT-6 Astra Pro

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

GLM 4.5 Air and GPT-6 Astra Pro compared across 6 shared prompts
Spec	GLM 4.5 Air	GPT-6 Astra Pro
Input price	$0.2/M tokens	$10/M tokens
Output price	$1.1/M tokens	$50/M tokens
Context window	128K tokens	1.1M tokens
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Jul 2025	Sep 2026

Our Verdict

GPT-6 Astra Pro

GLM 4.5 AirRunner-up

Not enough votes to call it. On the specs, GPT-6 Astra Pro 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 Pro

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

Novitabf16$0.13 in$0.85 out131k99.8% up SiliconFlowfp8$0.14 in$0.86 out131k99% up Z.aifp8$0.20 in$1.10 out131k98.3% up

GPT-6 Astra Pro2 hosts

HostInOutContextUptime

Azure AI Foundry$10.00 in$50.00 out1.1M98.9% up OpenAI$10.00 in$50.00 out1.1M99.6% up

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

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

5 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GLM 4.5 Air and GPT-6 Astra Pro?

Which is better, GLM 4.5 Air or GPT-6 Astra Pro?

How much does GLM 4.5 Air cost compared to GPT-6 Astra Pro?

How can I compare GLM 4.5 Air and GPT-6 Astra Pro on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

5 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GLM 4.5 Air and GPT-6 Astra Pro?

Which is better, GLM 4.5 Air or GPT-6 Astra Pro?

How much does GLM 4.5 Air cost compared to GPT-6 Astra Pro?

How can I compare GLM 4.5 Air and GPT-6 Astra Pro on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages