What is the difference between GPT-4.5 and Mistral Small 4?

GPT-4.5 is developed by OpenAI while Mistral Small 4 is developed by Mistral AI. GPT-4.5 has a 128K token context window vs Mistral Small 4's 262K. You can compare their actual outputs across 24 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or Mistral Small 4?

It depends on your use case. GPT-4.5 and Mistral Small 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 24 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to Mistral Small 4?

GPT-4.5 costs $75/M input tokens and Mistral Small 4 costs $0.15/M input tokens. Mistral Small 4 is $74.85/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 GPT-4.5 and Mistral Small 4 on Rival?

This page shows a side-by-side comparison of GPT-4.5 and Mistral Small 4 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 GPT-4.5 and Mistral Small 4?

GPT-4.5 is developed by OpenAI while Mistral Small 4 is developed by Mistral AI. GPT-4.5 has a 128K token context window vs Mistral Small 4's 262K. You can compare their actual outputs across 24 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or Mistral Small 4?

It depends on your use case. GPT-4.5 and Mistral Small 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 24 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to Mistral Small 4?

GPT-4.5 costs $75/M input tokens and Mistral Small 4 costs $0.15/M input tokens. Mistral Small 4 is $74.85/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 GPT-4.5 and Mistral Small 4 on Rival?

This page shows a side-by-side comparison of GPT-4.5 and Mistral Small 4 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.

GPT-4.5 vs Mistral Small 4: Which Is Better?

Updated Mar 2026

Our Verdict

GPT-4.5

Mistral Small 4

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Mistral Small 4 is 250x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-4.5

Input

$75.00

Output

$150.00

Mistral Small 4

Input

$0.15

500× cheaper

Output

$0.60

250× cheaper

Mistral Small 4 is cheaper on both — 500× input, 250× output

Writing DNA

Style Comparison

Similarity

51%

Mistral Small 4 uses 19.0x more emoji

GPT-4.5

Mistral Small 4

63%Vocabulary50%

16wSentence Length18w

0.57Hedging0.58

4.7Bold9.0

6.4Lists5.6

0.00Emoji0.19

1.30Headings1.10

0.54Transitions0.12

Based on 11 + 23 text responses

Research

What we learned reading every model

GPT-4.5 and Mistral Small 4 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

Mistral Small 4 vs GPT-5Cross-provider

GPT-4.5 vs MiniMax M3New provider

Mistral Small 4 vs Llama 4 MaverickNew provider

Updated Mar 2026

Our Verdict

GPT-4.5

Mistral Small 4

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Mistral Small 4 is 250x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-4.5

Input

$75.00

Output

$150.00

Mistral Small 4

Input

$0.15

500× cheaper

Output

$0.60

250× cheaper

Mistral Small 4 is cheaper on both — 500× input, 250× output

Writing DNA

Style Comparison

Similarity

51%

Mistral Small 4 uses 19.0x more emoji

GPT-4.5

Mistral Small 4

63%Vocabulary50%

16wSentence Length18w

0.57Hedging0.58

4.7Bold9.0

6.4Lists5.6

0.00Emoji0.19

1.30Headings1.10

0.54Transitions0.12

Based on 11 + 23 text responses

Research

What we learned reading every model

GPT-4.5 and Mistral Small 4 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

Mistral Small 4 vs GPT-5Cross-provider

GPT-4.5 vs MiniMax M3New provider

Mistral Small 4 vs Llama 4 MaverickNew provider