What is the difference between Claude Sonnet 4.5 and GPT-5 Mini?

Claude Sonnet 4.5 is developed by Anthropic while GPT-5 Mini is developed by OpenAI. in 17 community votes on Rival, Claude Sonnet 4.5 wins 67% of head-to-head matchups. These results are based on blind head-to-head voting across 43 challenges.

Which is better, Claude Sonnet 4.5 or GPT-5 Mini?

Based on 17 community votes on Rival, Claude Sonnet 4.5 wins 67% of head-to-head matchups against GPT-5 Mini. Claude Sonnet 4.5 is strongest in Reasoning, Web Design, Image Generation.

How much does Claude Sonnet 4.5 cost compared to GPT-5 Mini?

Claude Sonnet 4.5 costs $3/M input tokens and GPT-5 Mini costs $0.25/M input tokens. GPT-5 Mini is $2.75/M cheaper per input. The more expensive model wins 67% of duels, so the premium may be justified by quality.

How are Claude Sonnet 4.5 vs GPT-5 Mini 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. 17 votes have been collected for this pair across 43 challenges. All vote data is part of Rival's open dataset.

What is the difference between Claude Sonnet 4.5 and GPT-5 Mini?

Claude Sonnet 4.5 is developed by Anthropic while GPT-5 Mini is developed by OpenAI. in 17 community votes on Rival, Claude Sonnet 4.5 wins 67% of head-to-head matchups. These results are based on blind head-to-head voting across 43 challenges.

Which is better, Claude Sonnet 4.5 or GPT-5 Mini?

Based on 17 community votes on Rival, Claude Sonnet 4.5 wins 67% of head-to-head matchups against GPT-5 Mini. Claude Sonnet 4.5 is strongest in Reasoning, Web Design, Image Generation.

How much does Claude Sonnet 4.5 cost compared to GPT-5 Mini?

Claude Sonnet 4.5 costs $3/M input tokens and GPT-5 Mini costs $0.25/M input tokens. GPT-5 Mini is $2.75/M cheaper per input. The more expensive model wins 67% of duels, so the premium may be justified by quality.

How are Claude Sonnet 4.5 vs GPT-5 Mini 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. 17 votes have been collected for this pair across 43 challenges. All vote data is part of Rival's open dataset.

Claude Sonnet 4.5 vs GPT-5 Mini: Which Is Better?

Updated Sep 2025

Our Verdict

Claude Sonnet 4.5Winner

GPT-5 MiniRunner-up

Pick Claude Sonnet 4.5. In 17 blind votes, Claude Sonnet 4.5 wins 67% of the time. That's not luck.

Claude Sonnet 4.5 particularly excels in Web Design, Image Generation, Reasoning. GPT-5 Mini is 7.5x cheaper per token — worth considering if cost matters.

Clear winner

API pricing

Cost per 1M tokens

Claude Sonnet 4.5

Input

$3.00

Output

$15.00

GPT-5 Mini

Input

$0.25

12× cheaper

Output

$2.00

7.5× cheaper

GPT-5 Mini is cheaper on both — 12× input, 7.5× output

Writing DNA

Style Comparison

Similarity

36%

Claude Sonnet 4.5 uses 490.1x more bold

Claude Sonnet 4.5

GPT-5 Mini

64%Vocabulary62%

94wSentence Length21w

0.48Hedging0.16

4.9Bold0.0

8.0Lists3.4

0.45Emoji0.00

1.91Headings0.00

0.07Transitions0.05

Based on 20 + 15 text responses

Research

What we learned reading every model

Claude Sonnet 4.5 and GPT-5 Mini 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 Sep 2025

Our Verdict

Claude Sonnet 4.5Winner

GPT-5 MiniRunner-up

Pick Claude Sonnet 4.5. In 17 blind votes, Claude Sonnet 4.5 wins 67% of the time. That's not luck.

Claude Sonnet 4.5 particularly excels in Web Design, Image Generation, Reasoning. GPT-5 Mini is 7.5x cheaper per token — worth considering if cost matters.

Clear winner

API pricing

Cost per 1M tokens

Claude Sonnet 4.5

Input

$3.00

Output

$15.00

GPT-5 Mini

Input

$0.25

12× cheaper

Output

$2.00

7.5× cheaper

GPT-5 Mini is cheaper on both — 12× input, 7.5× output

Writing DNA

Style Comparison

Similarity

36%

Claude Sonnet 4.5 uses 490.1x more bold

Claude Sonnet 4.5

GPT-5 Mini

64%Vocabulary62%

94wSentence Length21w

0.48Hedging0.16

4.9Bold0.0

8.0Lists3.4

0.45Emoji0.00

1.91Headings0.00

0.07Transitions0.05

Based on 20 + 15 text responses

Research

What we learned reading every model

Claude Sonnet 4.5 and GPT-5 Mini 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 Mini vs MiniMax M3New provider

GPT-5 Mini vs Aurora AlphaNew provider

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