What is the difference between GPT-4 and GPT-6 Astra Pro?

Both are developed by OpenAI but target different use cases. GPT-4 has a 8K token context window vs GPT-6 Astra Pro's 1.1M. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

Which is better, GPT-4 or GPT-6 Astra Pro?

It depends on your use case. GPT-4 and GPT-6 Astra Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

How much does GPT-4 cost compared to GPT-6 Astra Pro?

GPT-4 costs $30/M input tokens and GPT-6 Astra Pro costs $10/M input tokens. GPT-6 Astra Pro is $20.00/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 GPT-4 and GPT-6 Astra Pro on Rival?

This page shows a side-by-side comparison of GPT-4 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

GPT-4vsGPT-6 Astra Pro

GPT-6 Astra Pro is cheaper than GPT-4 at $10/M vs $30/M input tokens.

GPT-4 and GPT-6 Astra Pro compared across 2 shared prompts
Spec	GPT-4	GPT-6 Astra Pro
Input price	$30/M tokens	$10/M tokens
Output price	$60/M tokens	$50/M tokens
Context window	8K tokens	1.1M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	May 2023	Sep 2026

Our Verdict

GPT-6 Astra Pro

GPT-4Runner-up

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

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-4

Input

$30.00

Output

$60.00

GPT-6 Astra Pro

Input

$10.00

3.0× cheaper

Output

$50.00

1.2× cheaper

GPT-6 Astra Pro is cheaper on both: 3.0× input, 1.2× output.

Where to run it

4 hosts

GPT-42 hosts

HostInOutContextUptime

Azure AI Foundry$30.00 in$60.00 out8k100% up OpenAI$30.00 in$60.00 out8k99.8% 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

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More comparisons

Cost per 1M tokens

4 hosts

What we learned reading every model

Common questions

What is the difference between GPT-4 and GPT-6 Astra Pro?

Which is better, GPT-4 or GPT-6 Astra Pro?

How much does GPT-4 cost compared to GPT-6 Astra Pro?

How can I compare GPT-4 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

4 hosts

What we learned reading every model

Common questions

What is the difference between GPT-4 and GPT-6 Astra Pro?

Which is better, GPT-4 or GPT-6 Astra Pro?

How much does GPT-4 cost compared to GPT-6 Astra Pro?

How can I compare GPT-4 and GPT-6 Astra Pro on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages