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

GLM 4.5 is developed by Zhipu AI while GPT-6 Astra Pro is developed by OpenAI. GLM 4.5 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 or GPT-6 Astra Pro?

It depends on your use case. GLM 4.5 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 cost compared to GPT-6 Astra Pro?

GLM 4.5 costs $0.6/M input tokens and GPT-6 Astra Pro costs $10/M input tokens. GLM 4.5 is $9.40/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 and GPT-6 Astra Pro on Rival?

This page shows a side-by-side comparison of GLM 4.5 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 4.5vsGPT-6 Astra Pro

GLM 4.5 is cheaper than GPT-6 Astra Pro at $0.6/M vs $10/M input tokens.

GLM 4.5 and GPT-6 Astra Pro compared across 6 shared prompts
Spec	GLM 4.5	GPT-6 Astra Pro
Input price	$0.6/M tokens	$10/M tokens
Output price	$2.2/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 4.5Runner-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 costs 23x less per token.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GLM 4.5

Input

$0.60

17× cheaper

Output

$2.20

23× cheaper

GPT-6 Astra Pro

Input

$10.00

Output

$50.00

GLM 4.5 is cheaper on both: 17× input, 23× output.

Where to run it

3 hosts

GLM 4.51 host

HostInOutContextUptime

Z.aifp8$0.60 in$2.20 out131k100% up

GPT-6 Astra Pro2 hosts

HostInOutContextUptime

Azure AI Foundry$10.00 in$50.00 out1.1M99.8% up OpenAI$10.00 in$50.00 out1.1M99.8% up

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

Research

What we learned reading every model

FAQ

Common questions

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More comparisons

Cost per 1M tokens

3 hosts

What we learned reading every model

Common questions

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

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

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

How can I compare GLM 4.5 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

3 hosts

What we learned reading every model

Common questions

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

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

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

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

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages