What is the difference between Claude Opus 4.1 and GPT-5 Nano?

Claude Opus 4.1 is developed by Anthropic while GPT-5 Nano is developed by OpenAI. in 4 community votes on Rival, Claude Opus 4.1 wins 75% of head-to-head matchups. These results are based on blind head-to-head voting across 53 challenges.

Which is better, Claude Opus 4.1 or GPT-5 Nano?

Based on 4 community votes on Rival, Claude Opus 4.1 wins 75% of head-to-head matchups against GPT-5 Nano.

How are Claude Opus 4.1 vs GPT-5 Nano votes collected on Rival?

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 4 votes have been collected for this pair across 53 challenges. All vote data is part of Rival's open dataset.

What is the difference between Claude Opus 4.1 and GPT-5 Nano?

Claude Opus 4.1 is developed by Anthropic while GPT-5 Nano is developed by OpenAI. in 4 community votes on Rival, Claude Opus 4.1 wins 75% of head-to-head matchups. These results are based on blind head-to-head voting across 53 challenges.

Which is better, Claude Opus 4.1 or GPT-5 Nano?

Based on 4 community votes on Rival, Claude Opus 4.1 wins 75% of head-to-head matchups against GPT-5 Nano.

How are Claude Opus 4.1 vs GPT-5 Nano votes collected on Rival?

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 4 votes have been collected for this pair across 53 challenges. All vote data is part of Rival's open dataset.

Claude Opus 4.1 vs GPT-5 Nano: Which Is Better?

Updated Aug 2025

Our Verdict

Claude Opus 4.1Winner

GPT-5 NanoRunner-up

Pick Claude Opus 4.1. In 4 blind votes, Claude Opus 4.1 wins 75% of the time. That's not luck.

Clear winner

API pricing

Cost per 1M tokens

Claude Opus 4.1

Input

$15.00

Output

$75.00

GPT-5 Nano

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

49%

Claude Opus 4.1 uses 509.5x more bold

Claude Opus 4.1

GPT-5 Nano

61%Vocabulary59%

87wSentence Length25w

0.54Hedging0.23

5.1Bold0.0

6.7Lists4.2

0.38Emoji0.00

1.68Headings0.00

0.13Transitions0.01

Based on 17 + 14 text responses

Research

What we learned reading every model

Claude Opus 4.1 and GPT-5 Nano 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

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Updated Aug 2025

Our Verdict

Claude Opus 4.1Winner

GPT-5 NanoRunner-up

Pick Claude Opus 4.1. In 4 blind votes, Claude Opus 4.1 wins 75% of the time. That's not luck.

Clear winner

API pricing

Cost per 1M tokens

Claude Opus 4.1

Input

$15.00

Output

$75.00

GPT-5 Nano

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

49%

Claude Opus 4.1 uses 509.5x more bold

Claude Opus 4.1

GPT-5 Nano

61%Vocabulary59%

87wSentence Length25w

0.54Hedging0.23

5.1Bold0.0

6.7Lists4.2

0.38Emoji0.00

1.68Headings0.00

0.13Transitions0.01

Based on 17 + 14 text responses

Research

What we learned reading every model

Claude Opus 4.1 and GPT-5 Nano 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

GPT-5 Nano vs MiniMax M3New provider

GPT-5 Nano vs Llama 4 MaverickNew provider

GPT-5 Nano vs Gemini 2.5 Pro Preview 06-05New provider