What is the difference between Claude Opus 5 and GPT-6 Astra Pro?

Claude Opus 5 is developed by Anthropic while GPT-6 Astra Pro is developed by OpenAI. Claude Opus 5 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 Opus 5 or GPT-6 Astra Pro?

It depends on your use case. Claude Opus 5 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 Opus 5 cost compared to GPT-6 Astra Pro?

Claude Opus 5 costs $5/M input tokens and GPT-6 Astra Pro costs $10/M input tokens. Claude Opus 5 is $5.00/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 Opus 5 and GPT-6 Astra Pro on Rival?

This page shows a side-by-side comparison of Claude Opus 5 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 Opus 5vsGPT-6 Astra Pro

Claude Opus 5 is cheaper than GPT-6 Astra Pro at $5/M vs $10/M input tokens.

Claude Opus 5 and GPT-6 Astra Pro compared across 6 shared prompts
Spec	Claude Opus 5	GPT-6 Astra Pro
Input price	$5/M tokens	$10/M tokens
Output price	$25/M tokens	$50/M tokens
Context window	1.0M tokens	1.1M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Jul 2026	Sep 2026