What is the difference between GPT-6 Astra Pro and Granite 4.2 8B?

GPT-6 Astra Pro is developed by OpenAI while Granite 4.2 8B is developed by IBM Granite. GPT-6 Astra Pro has a 1.1M token context window vs Granite 4.2 8B's 131K. 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 Granite 4.2 8B?

It depends on your use case. GPT-6 Astra Pro and Granite 4.2 8B 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 Granite 4.2 8B?

GPT-6 Astra Pro costs $10/M input tokens and Granite 4.2 8B costs $0.1/M input tokens. Granite 4.2 8B is $9.90/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 Granite 4.2 8B on Rival?

This page shows a side-by-side comparison of GPT-6 Astra Pro and Granite 4.2 8B 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 ProvsGranite 4.2 8B

Granite 4.2 8B is cheaper than GPT-6 Astra Pro at $0.1/M vs $10/M input tokens.

GPT-6 Astra Pro and Granite 4.2 8B compared across 6 shared prompts
Spec	GPT-6 Astra Pro	Granite 4.2 8B
Input price	$10/M tokens	$0.1/M tokens
Output price	$50/M tokens	$0.15/M tokens
Context window	1.1M tokens	131K tokens
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Aug 2026

Our Verdict

GPT-6 Astra Pro

Granite 4.2 8BRunner-up

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

Granite 4.2 8B costs 333x 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

Granite 4.2 8B

Input

$0.10

100× cheaper

Output

$0.15

333× cheaper

Granite 4.2 8B is cheaper on both: 100× input, 333× output.

Where to run it

4 hosts, cheapest first

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

Granite 4.2 8B2 hosts

HostInOutContextUptime

DeepInfrabf16$0.06 in$0.25 out131k100% up CoreWeavebf16$0.10 in$0.15 out131k100% 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

4 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GPT-6 Astra Pro and Granite 4.2 8B?

Which is better, GPT-6 Astra Pro or Granite 4.2 8B?

How much does GPT-6 Astra Pro cost compared to Granite 4.2 8B?

How can I compare GPT-6 Astra Pro and Granite 4.2 8B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

4 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GPT-6 Astra Pro and Granite 4.2 8B?

Which is better, GPT-6 Astra Pro or Granite 4.2 8B?

How much does GPT-6 Astra Pro cost compared to Granite 4.2 8B?

How can I compare GPT-6 Astra Pro and Granite 4.2 8B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages