What is the difference between Claude Haiku 4.5 and GPT-5.1?

Claude Haiku 4.5 is developed by Anthropic while GPT-5.1 is developed by OpenAI. Claude Haiku 4.5 has a 200K token context window vs GPT-5.1's 400K. in 2 community votes on Rival, GPT-5.1 wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 52 challenges.

Which is better, Claude Haiku 4.5 or GPT-5.1?

Based on 2 community votes on Rival, GPT-5.1 wins 100% of head-to-head matchups against Claude Haiku 4.5.

How much does Claude Haiku 4.5 cost compared to GPT-5.1?

Claude Haiku 4.5 costs $1/M input tokens and GPT-5.1 costs $1.25/M input tokens. Claude Haiku 4.5 is $0.25/M cheaper per input. The more expensive model wins 100% of duels, so the premium may be justified by quality.

How are Claude Haiku 4.5 vs GPT-5.1 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. 2 votes have been collected for this pair across 52 challenges. All vote data is part of Rival's open dataset.

What is the difference between Claude Haiku 4.5 and GPT-5.1?

Claude Haiku 4.5 is developed by Anthropic while GPT-5.1 is developed by OpenAI. Claude Haiku 4.5 has a 200K token context window vs GPT-5.1's 400K. in 2 community votes on Rival, GPT-5.1 wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 52 challenges.

Which is better, Claude Haiku 4.5 or GPT-5.1?

Based on 2 community votes on Rival, GPT-5.1 wins 100% of head-to-head matchups against Claude Haiku 4.5.

How much does Claude Haiku 4.5 cost compared to GPT-5.1?

Claude Haiku 4.5 costs $1/M input tokens and GPT-5.1 costs $1.25/M input tokens. Claude Haiku 4.5 is $0.25/M cheaper per input. The more expensive model wins 100% of duels, so the premium may be justified by quality.

How are Claude Haiku 4.5 vs GPT-5.1 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. 2 votes have been collected for this pair across 52 challenges. All vote data is part of Rival's open dataset.

Claude Haiku 4.5 vs GPT-5.1: Which Is Better?

Updated Nov 2025

Our Verdict

GPT-5.1Winner

Claude Haiku 4.5Runner-up

Pick GPT-5.1. In 2 blind votes, GPT-5.1 wins 100% of the time. That's not luck.

Clear winner

API pricing

Cost per 1M tokens

Claude Haiku 4.5

Input

$1.00

1.3× cheaper

Output

$5.00

2.0× cheaper

GPT-5.1

Input

$1.25

Output

$10.00

Claude Haiku 4.5 is cheaper on both — 1.3× input, 2.0× output

Writing DNA

Style Comparison

Similarity

49%

Claude Haiku 4.5 uses 20.4x more emoji

Claude Haiku 4.5

GPT-5.1

61%Vocabulary62%

47wSentence Length19w

0.64Hedging0.29

5.1Bold3.5

6.3Lists7.2

0.20Emoji0.00

2.46Headings0.61

0.17Transitions0.03

Based on 24 + 14 text responses

Research

What we learned reading every model

Claude Haiku 4.5 and GPT-5.1 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-5.1 vs MiniMax M3New provider

Claude Haiku 4.5 vs Grok 3New provider

Claude Haiku 4.5 vs Llama 4 MaverickNew provider

Updated Nov 2025

Our Verdict

GPT-5.1Winner

Claude Haiku 4.5Runner-up

Pick GPT-5.1. In 2 blind votes, GPT-5.1 wins 100% of the time. That's not luck.

Clear winner

API pricing

Cost per 1M tokens

Claude Haiku 4.5

Input

$1.00

1.3× cheaper

Output

$5.00

2.0× cheaper

GPT-5.1

Input

$1.25

Output

$10.00

Claude Haiku 4.5 is cheaper on both — 1.3× input, 2.0× output

Writing DNA

Style Comparison

Similarity

49%

Claude Haiku 4.5 uses 20.4x more emoji

Claude Haiku 4.5

GPT-5.1

61%Vocabulary62%

47wSentence Length19w

0.64Hedging0.29

5.1Bold3.5

6.3Lists7.2

0.20Emoji0.00

2.46Headings0.61

0.17Transitions0.03

Based on 24 + 14 text responses

Research

What we learned reading every model

Claude Haiku 4.5 and GPT-5.1 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-5.1 vs MiniMax M3New provider

Claude Haiku 4.5 vs Grok 3New provider

Claude Haiku 4.5 vs Llama 4 MaverickNew provider