What is the difference between Claude Sonnet 4.6 and GPT-6 Astra Pro?

Claude Sonnet 4.6 is developed by Anthropic while GPT-6 Astra Pro is developed by OpenAI. Claude Sonnet 4.6 has a 1.0M token context window vs GPT-6 Astra Pro's 1.1M. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4.6 or GPT-6 Astra Pro?

It depends on your use case. Claude Sonnet 4.6 and GPT-6 Astra Pro 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 Claude Sonnet 4.6 cost compared to GPT-6 Astra Pro?

Claude Sonnet 4.6 costs $3/M input tokens and GPT-6 Astra Pro costs $10/M input tokens. Claude Sonnet 4.6 is $7.00/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 Claude Sonnet 4.6 and GPT-6 Astra Pro on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4.6 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

Claude Sonnet 4.6vsGPT-6 Astra Pro

Claude Sonnet 4.6 is cheaper than GPT-6 Astra Pro at $3/M vs $10/M input tokens.

Claude Sonnet 4.6 and GPT-6 Astra Pro compared across 6 shared prompts
Spec	Claude Sonnet 4.6	GPT-6 Astra Pro
Input price	$3/M tokens	$10/M tokens
Output price	$15/M tokens	$50/M tokens
Context window	1.0M tokens	1.1M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Feb 2026	Sep 2026

Our Verdict

GPT-6 Astra Pro

Claude Sonnet 4.6Runner-up

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

Claude Sonnet 4.6 costs 3.3x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Sonnet 4.6

Input

$3.00

3.3× cheaper

Output

$15.00

3.3× cheaper

GPT-6 Astra Pro

Input

$10.00

Output

$50.00

Claude Sonnet 4.6 is cheaper on both: 3.3× input, 3.3× output.

Where to run it

6 hosts

Claude Sonnet 4.64 hosts

HostInOutContextUptime

Amazon Bedrock$3.00 in$15.00 out1M99.9% up Azure AI Foundry$3.00 in$15.00 out1M99.3% up Anthropic$3.00 in$15.00 out1M100% up Google Vertex AI$3.00 in$15.00 out1M100% 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

Keep exploring

More comparisons

Cost per 1M tokens

6 hosts

What we learned reading every model

Common questions

What is the difference between Claude Sonnet 4.6 and GPT-6 Astra Pro?

Which is better, Claude Sonnet 4.6 or GPT-6 Astra Pro?

How much does Claude Sonnet 4.6 cost compared to GPT-6 Astra Pro?

How can I compare Claude Sonnet 4.6 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

6 hosts

What we learned reading every model

Common questions

What is the difference between Claude Sonnet 4.6 and GPT-6 Astra Pro?

Which is better, Claude Sonnet 4.6 or GPT-6 Astra Pro?

How much does Claude Sonnet 4.6 cost compared to GPT-6 Astra Pro?

How can I compare Claude Sonnet 4.6 and GPT-6 Astra Pro on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages