What is the difference between Claude Opus 5 and DeepSeek V3.1?

Claude Opus 5 is developed by Anthropic while DeepSeek V3.1 is developed by DeepSeek. Claude Opus 5 has a 1.0M token context window vs DeepSeek V3.1'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 5 or DeepSeek V3.1?

It depends on your use case. Claude Opus 5 and DeepSeek V3.1 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 5 cost compared to DeepSeek V3.1?

Claude Opus 5 costs $5/M input tokens and DeepSeek V3.1 costs $0.2/M input tokens. DeepSeek V3.1 is $4.80/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 DeepSeek V3.1 on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and DeepSeek V3.1 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.

What is the difference between Claude Opus 5 and DeepSeek V3.1?

Claude Opus 5 is developed by Anthropic while DeepSeek V3.1 is developed by DeepSeek. Claude Opus 5 has a 1.0M token context window vs DeepSeek V3.1'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 5 or DeepSeek V3.1?

It depends on your use case. Claude Opus 5 and DeepSeek V3.1 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 5 cost compared to DeepSeek V3.1?

Claude Opus 5 costs $5/M input tokens and DeepSeek V3.1 costs $0.2/M input tokens. DeepSeek V3.1 is $4.80/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 DeepSeek V3.1 on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and DeepSeek V3.1 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.

Claude Opus 5 vs DeepSeek V3.1: Which Is Better?

Updated Jul 2026

Our Verdict

Claude Opus 5

DeepSeek V3.1Runner-up

No community votes yet. On paper, Claude Opus 5 has the edge — newer, bigger context window.

DeepSeek V3.1 is 31x cheaper per token — worth considering if cost matters.

Too close to call

What do Claude Opus 5 and DeepSeek V3.1 say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

DeepSeek V3.1

Input

$0.20

25× cheaper

Output

$0.80

31× cheaper

DeepSeek V3.1 is cheaper on both — 25× input, 31× output

Writing DNA

Style Comparison

Similarity

53%

DeepSeek V3.1 uses 4.3x more transitions

Claude Opus 5

DeepSeek V3.1

54%Vocabulary53%

21wSentence Length14w

0.40Hedging0.42

3.9Bold4.0

1.9Lists3.6

0.02Emoji0.02

0.71Headings0.40

0.05Transitions0.22

Based on 27 + 23 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Claude Opus 5 vs Ox AlphaNew provider

Claude Opus 5 vs MiniMax M3New provider

Claude Opus 5 vs GPT-5New provider

Updated Jul 2026

Our Verdict

Claude Opus 5

DeepSeek V3.1Runner-up

No community votes yet. On paper, Claude Opus 5 has the edge — newer, bigger context window.

DeepSeek V3.1 is 31x cheaper per token — worth considering if cost matters.

Too close to call

What do Claude Opus 5 and DeepSeek V3.1 say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

DeepSeek V3.1

Input

$0.20

25× cheaper

Output

$0.80

31× cheaper

DeepSeek V3.1 is cheaper on both — 25× input, 31× output

Writing DNA

Style Comparison

Similarity

53%

DeepSeek V3.1 uses 4.3x more transitions

Claude Opus 5

DeepSeek V3.1

54%Vocabulary53%

21wSentence Length14w

0.40Hedging0.42

3.9Bold4.0

1.9Lists3.6

0.02Emoji0.02

0.71Headings0.40

0.05Transitions0.22

Based on 27 + 23 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Claude Opus 5 vs Ox AlphaNew provider

Claude Opus 5 vs MiniMax M3New provider

Claude Opus 5 vs GPT-5New provider