What is the difference between Claude 3 Sonnet and GPT-6 Astra Pro?

Claude 3 Sonnet is developed by Anthropic while GPT-6 Astra Pro is developed by OpenAI. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Sonnet or GPT-6 Astra Pro?

It depends on your use case. Claude 3 Sonnet and GPT-6 Astra Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

How much does Claude 3 Sonnet cost compared to GPT-6 Astra Pro?

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

This page shows a side-by-side comparison of Claude 3 Sonnet 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 3 SonnetvsGPT-6 Astra Pro

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

Claude 3 Sonnet and GPT-6 Astra Pro compared across 2 shared prompts
Spec	Claude 3 Sonnet	GPT-6 Astra Pro
Input price	$3/M tokens	$10/M tokens
Output price	$15/M tokens	$50/M tokens
Context window	—	1.1M tokens
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Mar 2024	Sep 2026