What is the difference between GPT-5.1 and GPT-5.4 Nano?

Both are developed by OpenAI but target different use cases. GPT-5.1 has a 400K token context window vs GPT-5.4 Nano's 400K. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 or GPT-5.4 Nano?

It depends on your use case. GPT-5.1 and GPT-5.4 Nano each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does GPT-5.1 cost compared to GPT-5.4 Nano?

GPT-5.1 costs $1.25/M input tokens and GPT-5.4 Nano costs $0.2/M input tokens. GPT-5.4 Nano is $1.05/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-5.1 and GPT-5.4 Nano on Rival?

This page shows a side-by-side comparison of GPT-5.1 and GPT-5.4 Nano 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-5.1 and GPT-5.4 Nano?

Both are developed by OpenAI but target different use cases. GPT-5.1 has a 400K token context window vs GPT-5.4 Nano's 400K. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 or GPT-5.4 Nano?

It depends on your use case. GPT-5.1 and GPT-5.4 Nano each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does GPT-5.1 cost compared to GPT-5.4 Nano?

GPT-5.1 costs $1.25/M input tokens and GPT-5.4 Nano costs $0.2/M input tokens. GPT-5.4 Nano is $1.05/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-5.1 and GPT-5.4 Nano on Rival?

This page shows a side-by-side comparison of GPT-5.1 and GPT-5.4 Nano 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-5.1 vs GPT-5.4 Nano: Which Is Better?

Updated Mar 2026

Our Verdict

GPT-5.1

GPT-5.4 Nano

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

GPT-5.4 Nano is 8.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1

Input

$1.25

Output

$10.00

GPT-5.4 Nano

Input

$0.20

6.3× cheaper

Output

$1.25

8.0× cheaper

GPT-5.4 Nano is cheaper on both — 6.3× input, 8.0× output

Writing DNA

Style Comparison

Similarity

48%

GPT-5.1

GPT-5.4 Nano

62%Vocabulary51%

19wSentence Length21w

0.29Hedging0.58

3.5Bold7.1

7.2Lists5.5

0.00Emoji0.01

0.61Headings1.39

0.03Transitions0.05

Based on 14 + 23 text responses

Research

What we learned reading every model

GPT-5.1 and GPT-5.4 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-5.1 vs MiniMax M3New provider

GPT-5.1 vs Grok 3New provider

GPT-5.1 vs Llama 4 MaverickNew provider

Updated Mar 2026

Our Verdict

GPT-5.1

GPT-5.4 Nano

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

GPT-5.4 Nano is 8.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1

Input

$1.25

Output

$10.00

GPT-5.4 Nano

Input

$0.20

6.3× cheaper

Output

$1.25

8.0× cheaper

GPT-5.4 Nano is cheaper on both — 6.3× input, 8.0× output

Writing DNA

Style Comparison

Similarity

48%

GPT-5.1

GPT-5.4 Nano

62%Vocabulary51%

19wSentence Length21w

0.29Hedging0.58

3.5Bold7.1

7.2Lists5.5

0.00Emoji0.01

0.61Headings1.39

0.03Transitions0.05

Based on 14 + 23 text responses

Research

What we learned reading every model

GPT-5.1 and GPT-5.4 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-5.1 vs MiniMax M3New provider

GPT-5.1 vs Grok 3New provider

GPT-5.1 vs Llama 4 MaverickNew provider