What is the difference between GPT-6 Astra Pro and Seed 2.1 Turbo?

GPT-6 Astra Pro is developed by OpenAI while Seed 2.1 Turbo is developed by ByteDance. GPT-6 Astra Pro has a 1.1M token context window vs Seed 2.1 Turbo's 262K. 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 Seed 2.1 Turbo?

It depends on your use case. GPT-6 Astra Pro and Seed 2.1 Turbo 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 Seed 2.1 Turbo?

GPT-6 Astra Pro costs $10/M input tokens and Seed 2.1 Turbo costs $0.5/M input tokens. Seed 2.1 Turbo is $9.50/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 Seed 2.1 Turbo on Rival?

This page shows a side-by-side comparison of GPT-6 Astra Pro and Seed 2.1 Turbo 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 ProvsSeed 2.1 Turbo

Seed 2.1 Turbo is cheaper than GPT-6 Astra Pro at $0.5/M vs $10/M input tokens.

GPT-6 Astra Pro and Seed 2.1 Turbo compared across 6 shared prompts
Spec	GPT-6 Astra Pro	Seed 2.1 Turbo
Input price	$10/M tokens	$0.5/M tokens
Output price	$50/M tokens	$2.5/M tokens
Context window	1.1M tokens	262K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Sep 2026	Aug 2026

Our Verdict

GPT-6 Astra Pro

Seed 2.1 TurboRunner-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.

Seed 2.1 Turbo costs 20x 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

Seed 2.1 Turbo

Input

$0.50

20× cheaper

Output

$2.50

20× cheaper

Seed 2.1 Turbo is cheaper on both: 20× input, 20× 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

Seed 2.1 Turbo1 host

HostInOutContextUptime

ByteDance Seedfp8$0.50 in$2.50 out262k100% 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 Seed 2.1 Turbo?

Which is better, GPT-6 Astra Pro or Seed 2.1 Turbo?

How much does GPT-6 Astra Pro cost compared to Seed 2.1 Turbo?

How can I compare GPT-6 Astra Pro and Seed 2.1 Turbo 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 Seed 2.1 Turbo?

Which is better, GPT-6 Astra Pro or Seed 2.1 Turbo?

How much does GPT-6 Astra Pro cost compared to Seed 2.1 Turbo?

How can I compare GPT-6 Astra Pro and Seed 2.1 Turbo on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages