What is the difference between GPT-6 Astra Pro and GPT OSS 20B?

Both are developed by OpenAI but target different use cases. GPT-6 Astra Pro has a 1.1M token context window vs GPT OSS 20B'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 GPT OSS 20B?

It depends on your use case. GPT-6 Astra Pro and GPT OSS 20B 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 GPT OSS 20B?

GPT-6 Astra Pro costs $10/M input tokens and GPT OSS 20B costs $0.02/M input tokens. GPT OSS 20B is $9.98/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 GPT OSS 20B on Rival?

This page shows a side-by-side comparison of GPT-6 Astra Pro and GPT OSS 20B 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 ProvsGPT OSS 20B

GPT OSS 20B is cheaper than GPT-6 Astra Pro at $0.02/M vs $10/M input tokens.

GPT-6 Astra Pro and GPT OSS 20B compared across 6 shared prompts
Spec	GPT-6 Astra Pro	GPT OSS 20B
Input price	$10/M tokens	$0.02/M tokens
Output price	$50/M tokens	$0.1/M tokens
Context window	1.1M tokens	131K tokens
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Aug 2025

Our Verdict

GPT-6 Astra Pro

GPT OSS 20BRunner-up

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

GPT OSS 20B costs 500x 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

GPT OSS 20B

Input

$0.02

500× cheaper

Output

$0.10

500× cheaper

GPT OSS 20B is cheaper on both: 500× input, 500× output.

Where to run it

15 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

GPT OSS 20B13 hosts

HostInOutContextUptime

AkashMLfp4$0.02 in$0.10 out131k99.5% up Darkbloomfp8$0.02 in$0.10 out131k98.9% up DekaLLMbf16$0.03 in$0.14 out131k99.7% up CoreWeavefp4$0.03 in$0.13 out131k100% up DeepInfrabf16$0.03 in$0.14 out131k99.9% up Parasailfp4$0.03 in$0.15 out131k99.9% up

7 more hosts

Novitafp4$0.04 in$0.15 out131k99.7% up Phala$0.04 in$0.15 out131k99.2% up SiliconFlowfp8$0.04 in$0.18 out131k95.7% up Together$0.05 in$0.20 out131k42.5% up Amazon Bedrock$0.07 in$0.15 out131k98.4% up Google Vertex AI$0.07 in$0.25 out131k99.4% up Groq$0.07 in$0.30 out131k99.7% 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

15 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GPT-6 Astra Pro and GPT OSS 20B?

Which is better, GPT-6 Astra Pro or GPT OSS 20B?

How much does GPT-6 Astra Pro cost compared to GPT OSS 20B?

How can I compare GPT-6 Astra Pro and GPT OSS 20B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

15 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GPT-6 Astra Pro and GPT OSS 20B?

Which is better, GPT-6 Astra Pro or GPT OSS 20B?

How much does GPT-6 Astra Pro cost compared to GPT OSS 20B?

How can I compare GPT-6 Astra Pro and GPT OSS 20B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages