What is the difference between ChatGPT-4o (March 2025) and DeepSeek V4 Flash 0731?

ChatGPT-4o (March 2025) is developed by OpenAI while DeepSeek V4 Flash 0731 is developed by DeepSeek. ChatGPT-4o (March 2025) has a 128K token context window vs DeepSeek V4 Flash 0731's 1.0M. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or DeepSeek V4 Flash 0731?

It depends on your use case. ChatGPT-4o (March 2025) and DeepSeek V4 Flash 0731 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 25 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to DeepSeek V4 Flash 0731?

ChatGPT-4o (March 2025) costs $5/M input tokens and DeepSeek V4 Flash 0731 costs $0.14/M input tokens. DeepSeek V4 Flash 0731 is $4.86/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 DeepSeek V4 Flash 0731 on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and DeepSeek V4 Flash 0731 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 DeepSeek V4 Flash 0731?

ChatGPT-4o (March 2025) is developed by OpenAI while DeepSeek V4 Flash 0731 is developed by DeepSeek. ChatGPT-4o (March 2025) has a 128K token context window vs DeepSeek V4 Flash 0731's 1.0M. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or DeepSeek V4 Flash 0731?

It depends on your use case. ChatGPT-4o (March 2025) and DeepSeek V4 Flash 0731 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 25 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to DeepSeek V4 Flash 0731?

ChatGPT-4o (March 2025) costs $5/M input tokens and DeepSeek V4 Flash 0731 costs $0.14/M input tokens. DeepSeek V4 Flash 0731 is $4.86/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 DeepSeek V4 Flash 0731 on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and DeepSeek V4 Flash 0731 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 DeepSeek V4 Flash 0731: Which Is Better?

Updated Jul 2026

Our Verdict

ChatGPT-4o (March 2025)

DeepSeek V4 Flash 0731

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

DeepSeek V4 Flash 0731 is 54x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

DeepSeek V4 Flash 0731

Input

$0.14

36× cheaper

Output

$0.28

54× cheaper

DeepSeek V4 Flash 0731 is cheaper on both — 36× input, 54× output

Writing DNA

Style Comparison

Similarity

55%

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

ChatGPT-4o (March 2025)

DeepSeek V4 Flash 0731

55%Vocabulary52%

24wSentence Length18w

0.52Hedging0.38

3.3Bold5.7

6.0Lists3.4

0.94Emoji0.00

0.63Headings0.83

0.05Transitions0.04

Based on 15 + 23 text responses

Research

What we learned reading every model

ChatGPT-4o (March 2025) and DeepSeek V4 Flash 0731 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

DeepSeek V4 Flash 0731 vs Llama 4 MaverickNew provider

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

Updated Jul 2026

Our Verdict

ChatGPT-4o (March 2025)

DeepSeek V4 Flash 0731

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

DeepSeek V4 Flash 0731 is 54x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

DeepSeek V4 Flash 0731

Input

$0.14

36× cheaper

Output

$0.28

54× cheaper

DeepSeek V4 Flash 0731 is cheaper on both — 36× input, 54× output

Writing DNA

Style Comparison

Similarity

55%

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

ChatGPT-4o (March 2025)

DeepSeek V4 Flash 0731

55%Vocabulary52%

24wSentence Length18w

0.52Hedging0.38

3.3Bold5.7

6.0Lists3.4

0.94Emoji0.00

0.63Headings0.83

0.05Transitions0.04

Based on 15 + 23 text responses

Research

What we learned reading every model

ChatGPT-4o (March 2025) and DeepSeek V4 Flash 0731 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

DeepSeek V4 Flash 0731 vs Llama 4 MaverickNew provider

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