What is the difference between Claude Opus 4.1 and Horizon Alpha?

Claude Opus 4.1 is developed by Anthropic while Horizon Alpha is developed by OpenRouter. Claude Opus 4.1 has a 200K token context window vs Horizon Alpha's 256K. You can compare their actual outputs across 33 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.1 or Horizon Alpha?

It depends on your use case. Claude Opus 4.1 and Horizon Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 33 challenges so you can judge which fits your needs best.

How much does Claude Opus 4.1 cost compared to Horizon Alpha?

Claude Opus 4.1 costs $15/M input tokens and Horizon Alpha costs $0/M input tokens. Horizon Alpha 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 Horizon Alpha on Rival?

This page shows a side-by-side comparison of Claude Opus 4.1 and Horizon Alpha 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 4.1 and Horizon Alpha?

Claude Opus 4.1 is developed by Anthropic while Horizon Alpha is developed by OpenRouter. Claude Opus 4.1 has a 200K token context window vs Horizon Alpha's 256K. You can compare their actual outputs across 33 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.1 or Horizon Alpha?

It depends on your use case. Claude Opus 4.1 and Horizon Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 33 challenges so you can judge which fits your needs best.

How much does Claude Opus 4.1 cost compared to Horizon Alpha?

Claude Opus 4.1 costs $15/M input tokens and Horizon Alpha costs $0/M input tokens. Horizon Alpha 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 Horizon Alpha on Rival?

This page shows a side-by-side comparison of Claude Opus 4.1 and Horizon Alpha 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 4.1 vs Horizon Alpha: Which Is Better?

Updated Aug 2025

Our Verdict

Claude Opus 4.1

Horizon AlphaRunner-up

No community votes yet. On paper, Claude Opus 4.1 has the edge — bigger model tier, major provider backing.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.1

Input

$15.00

Output

$75.00

Horizon Alpha

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

39%

Claude Opus 4.1 uses 509.5x more bold

Claude Opus 4.1

Horizon Alpha

61%Vocabulary65%

87wSentence Length14w

0.54Hedging0.22

5.1Bold0.0

6.7Lists3.5

0.38Emoji0.00

1.68Headings0.00

0.13Transitions0.12

Based on 17 + 14 text responses

Research

What we learned reading every model

Claude Opus 4.1 and Horizon Alpha 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

Horizon Alpha vs MiniMax M3New provider

Horizon Alpha vs GPT-5New provider

Horizon Alpha vs Llama 4 MaverickNew provider

Updated Aug 2025

Our Verdict

Claude Opus 4.1

Horizon AlphaRunner-up

No community votes yet. On paper, Claude Opus 4.1 has the edge — bigger model tier, major provider backing.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.1

Input

$15.00

Output

$75.00

Horizon Alpha

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

39%

Claude Opus 4.1 uses 509.5x more bold

Claude Opus 4.1

Horizon Alpha

61%Vocabulary65%

87wSentence Length14w

0.54Hedging0.22

5.1Bold0.0

6.7Lists3.5

0.38Emoji0.00

1.68Headings0.00

0.13Transitions0.12

Based on 17 + 14 text responses

Research

What we learned reading every model

Claude Opus 4.1 and Horizon Alpha 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

Horizon Alpha vs MiniMax M3New provider

Horizon Alpha vs GPT-5New provider

Horizon Alpha vs Llama 4 MaverickNew provider