What is the difference between Claude Opus 4.1 and DeepSeek R1 0528?

Claude Opus 4.1 is developed by Anthropic while DeepSeek R1 0528 is developed by DeepSeek. Claude Opus 4.1 has a 200K token context window vs DeepSeek R1 0528's 164K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.1 or DeepSeek R1 0528?

It depends on your use case. Claude Opus 4.1 and DeepSeek R1 0528 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Claude Opus 4.1 cost compared to DeepSeek R1 0528?

Claude Opus 4.1 costs $15/M input tokens and DeepSeek R1 0528 costs $0/M input tokens. DeepSeek R1 0528 is $15.00/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 4.1 and DeepSeek R1 0528 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.1 and DeepSeek R1 0528 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 Aug 2025

Claude Opus 4.1vsDeepSeek R1 0528

DeepSeek R1 0528 is cheaper than Claude Opus 4.1 at $0/M vs $15/M input tokens.

Claude Opus 4.1 and DeepSeek R1 0528 compared across 53 shared prompts
Spec	Claude Opus 4.1	DeepSeek R1 0528
Input price	$15/M tokens	Free
Output price	$75/M tokens	Free
Context window	200K tokens	164K tokens
Parameters	Not disclosed	671B (37B active)
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	Aug 2025	May 2025
SWE-bench Verified	74.5%	57.6%