What is the difference between Claude Opus 5 and INTELLECT-3?

Claude Opus 5 is developed by Anthropic while INTELLECT-3 is developed by OpenRouter. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or INTELLECT-3?

It depends on your use case. Claude Opus 5 and INTELLECT-3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 5 and INTELLECT-3 on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and INTELLECT-3 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 INTELLECT-3?

Claude Opus 5 is developed by Anthropic while INTELLECT-3 is developed by OpenRouter. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or INTELLECT-3?

It depends on your use case. Claude Opus 5 and INTELLECT-3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 5 and INTELLECT-3 on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and INTELLECT-3 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 INTELLECT-3: Which Is Better?

Updated Jul 2026

Our Verdict

Claude Opus 5

INTELLECT-3Runner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window, major provider backing.

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

INTELLECT-3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

22%

INTELLECT-3 uses 4.9x more transitions

Claude Opus 5

INTELLECT-3

54%Vocabulary55%

21wSentence Length21w

0.40Hedging0.60

3.9Bold4.9

1.9Lists4.7

0.02Emoji0.02

0.71Headings1.16

0.05Transitions0.25

Based on 27 + 24 text responses

Research

What we learned reading every model

Claude Opus 5 and INTELLECT-3 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

INTELLECT-3 vs MiniMax M3New provider

INTELLECT-3 vs Gemini 2.5 Pro Preview 06-05New provider

INTELLECT-3 vs GPT-5New provider

Updated Jul 2026

Our Verdict

Claude Opus 5

INTELLECT-3Runner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window, major provider backing.

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

INTELLECT-3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

22%

INTELLECT-3 uses 4.9x more transitions

Claude Opus 5

INTELLECT-3

54%Vocabulary55%

21wSentence Length21w

0.40Hedging0.60

3.9Bold4.9

1.9Lists4.7

0.02Emoji0.02

0.71Headings1.16

0.05Transitions0.25

Based on 27 + 24 text responses

Research

What we learned reading every model

Claude Opus 5 and INTELLECT-3 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

INTELLECT-3 vs MiniMax M3New provider

INTELLECT-3 vs Gemini 2.5 Pro Preview 06-05New provider

INTELLECT-3 vs GPT-5New provider