What is the difference between GPT-6 Astra Pro and o3 Mini?

Both are developed by OpenAI but target different use cases. GPT-6 Astra Pro has a 1.1M token context window vs o3 Mini's 64K. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, GPT-6 Astra Pro or o3 Mini?

It depends on your use case. GPT-6 Astra Pro and o3 Mini 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 GPT-6 Astra Pro cost compared to o3 Mini?

GPT-6 Astra Pro costs $10/M input tokens and o3 Mini costs $1.1/M input tokens. o3 Mini is $8.90/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-6 Astra Pro and o3 Mini on Rival?

This page shows a side-by-side comparison of GPT-6 Astra Pro and o3 Mini 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-6 Astra Provso3 Mini

o3 Mini is cheaper than GPT-6 Astra Pro at $1.1/M vs $10/M input tokens.

GPT-6 Astra Pro and o3 Mini compared across 6 shared prompts
Spec	GPT-6 Astra Pro	o3 Mini
Input price	$10/M tokens	$1.1/M tokens
Output price	$50/M tokens	$4.4/M tokens
Context window	1.1M tokens	64K tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Dec 2024

Our Verdict

GPT-6 Astra Pro

o3 MiniRunner-up

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

o3 Mini costs 11x less per token.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-6 Astra Pro

Input

$10.00

Output

$50.00

o3 Mini

Input

$1.10

9.1× cheaper

Output

$4.40

11× cheaper

o3 Mini is cheaper on both: 9.1× input, 11× output.

Where to run it

3 hosts

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

o3 Mini1 host

HostInOutContextUptime

OpenAI$1.10 in$4.40 out200k100% 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

3 hosts

What we learned reading every model

Common questions

What is the difference between GPT-6 Astra Pro and o3 Mini?

Which is better, GPT-6 Astra Pro or o3 Mini?

How much does GPT-6 Astra Pro cost compared to o3 Mini?

How can I compare GPT-6 Astra Pro and o3 Mini 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 GPT-6 Astra Pro and o3 Mini?

Which is better, GPT-6 Astra Pro or o3 Mini?

How much does GPT-6 Astra Pro cost compared to o3 Mini?

How can I compare GPT-6 Astra Pro and o3 Mini on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages