What is the difference between ChatGPT-4o (March 2025) and GPT-5.5?

Both are developed by OpenAI but target different use cases. ChatGPT-4o (March 2025) has a 128K token context window vs GPT-5.5's 1.1M. You can compare their actual outputs across 32 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or GPT-5.5?

It depends on your use case. ChatGPT-4o (March 2025) and GPT-5.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 32 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to GPT-5.5?

ChatGPT-4o (March 2025) costs $5/M input tokens and GPT-5.5 costs $5/M input tokens. GPT-5.5 is $0.00/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 ChatGPT-4o (March 2025) and GPT-5.5 on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and GPT-5.5 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 ChatGPT-4o (March 2025) and GPT-5.5?

Both are developed by OpenAI but target different use cases. ChatGPT-4o (March 2025) has a 128K token context window vs GPT-5.5's 1.1M. You can compare their actual outputs across 32 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or GPT-5.5?

It depends on your use case. ChatGPT-4o (March 2025) and GPT-5.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 32 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to GPT-5.5?

ChatGPT-4o (March 2025) costs $5/M input tokens and GPT-5.5 costs $5/M input tokens. GPT-5.5 is $0.00/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 ChatGPT-4o (March 2025) and GPT-5.5 on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and GPT-5.5 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.

ChatGPT-4o (March 2025) vs GPT-5.5: Which Is Better?

Updated Apr 2026

Our Verdict

GPT-5.5

ChatGPT-4o (March 2025)Runner-up

No community votes yet. On paper, GPT-5.5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

2.0× cheaper

GPT-5.5

Input

$5.00

Output

$30.00

Writing DNA

Style Comparison

Similarity

47%

ChatGPT-4o (March 2025) uses 94.5x more emoji

ChatGPT-4o (March 2025)

GPT-5.5

55%Vocabulary58%

24wSentence Length18w

0.52Hedging0.74

3.3Bold2.9

6.0Lists5.1

0.94Emoji0.00

0.63Headings1.68

0.05Transitions0.03

Based on 15 + 26 text responses

Research

What we learned reading every model

ChatGPT-4o (March 2025) and GPT-5.5 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

ChatGPT-4o (March 2025) vs MiniMax M3New provider

ChatGPT-4o (March 2025) vs Llama 4 MaverickNew provider

ChatGPT-4o (March 2025) vs Claude Opus 4New provider

Updated Apr 2026

Our Verdict

GPT-5.5

ChatGPT-4o (March 2025)Runner-up

No community votes yet. On paper, GPT-5.5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

2.0× cheaper

GPT-5.5

Input

$5.00

Output

$30.00

Writing DNA

Style Comparison

Similarity

47%

ChatGPT-4o (March 2025) uses 94.5x more emoji

ChatGPT-4o (March 2025)

GPT-5.5

55%Vocabulary58%

24wSentence Length18w

0.52Hedging0.74

3.3Bold2.9

6.0Lists5.1

0.94Emoji0.00

0.63Headings1.68

0.05Transitions0.03

Based on 15 + 26 text responses

Research

What we learned reading every model

ChatGPT-4o (March 2025) and GPT-5.5 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

ChatGPT-4o (March 2025) vs MiniMax M3New provider

ChatGPT-4o (March 2025) vs Llama 4 MaverickNew provider

ChatGPT-4o (March 2025) vs Claude Opus 4New provider