What is the difference between DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free)?

DeepSeek V4 Flash 0731 is developed by DeepSeek while xAI: Grok 4 Fast (free) is developed by xAI. DeepSeek V4 Flash 0731 has a 1.0M token context window vs xAI: Grok 4 Fast (free)'s 2.0M. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4 Flash 0731 or xAI: Grok 4 Fast (free)?

It depends on your use case. DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free) 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 DeepSeek V4 Flash 0731 cost compared to xAI: Grok 4 Fast (free)?

DeepSeek V4 Flash 0731 costs $0.14/M input tokens and xAI: Grok 4 Fast (free) costs $0/M input tokens. xAI: Grok 4 Fast (free) is $0.14/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 DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free) on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free) 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 DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free)?

DeepSeek V4 Flash 0731 is developed by DeepSeek while xAI: Grok 4 Fast (free) is developed by xAI. DeepSeek V4 Flash 0731 has a 1.0M token context window vs xAI: Grok 4 Fast (free)'s 2.0M. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4 Flash 0731 or xAI: Grok 4 Fast (free)?

It depends on your use case. DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free) 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 DeepSeek V4 Flash 0731 cost compared to xAI: Grok 4 Fast (free)?

DeepSeek V4 Flash 0731 costs $0.14/M input tokens and xAI: Grok 4 Fast (free) costs $0/M input tokens. xAI: Grok 4 Fast (free) is $0.14/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 DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free) on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free) 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.

DeepSeek V4 Flash 0731 vs xAI: Grok 4 Fast (free): Which Is Better?

Updated Jul 2026

Our Verdict

DeepSeek V4 Flash 0731

xAI: Grok 4 Fast (free)

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

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4 Flash 0731

Input

$0.14

Output

$0.28

xAI: Grok 4 Fast (free)

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

33%

xAI: Grok 4 Fast (free) uses 7.7x more transitions

DeepSeek V4 Flash 0731

xAI: Grok 4 Fast (free)

52%Vocabulary65%

18wSentence Length13w

0.38Hedging0.56

5.7Bold1.4

3.4Lists2.5

0.00Emoji0.00

0.83Headings1.58

0.04Transitions0.28

Based on 23 + 14 text responses

Research

What we learned reading every model

DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free) 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

DeepSeek V4 Flash 0731 vs MiniMax M3New provider

DeepSeek V4 Flash 0731 vs Claude Sonnet 4New provider

xAI: Grok 4 Fast (free) vs Aurora AlphaNew provider

Updated Jul 2026

Our Verdict

DeepSeek V4 Flash 0731

xAI: Grok 4 Fast (free)

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

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4 Flash 0731

Input

$0.14

Output

$0.28

xAI: Grok 4 Fast (free)

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

33%

xAI: Grok 4 Fast (free) uses 7.7x more transitions

DeepSeek V4 Flash 0731

xAI: Grok 4 Fast (free)

52%Vocabulary65%

18wSentence Length13w

0.38Hedging0.56

5.7Bold1.4

3.4Lists2.5

0.00Emoji0.00

0.83Headings1.58

0.04Transitions0.28

Based on 23 + 14 text responses

Research

What we learned reading every model

DeepSeek V4 Flash 0731 and xAI: Grok 4 Fast (free) 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

DeepSeek V4 Flash 0731 vs MiniMax M3New provider

DeepSeek V4 Flash 0731 vs Claude Sonnet 4New provider

xAI: Grok 4 Fast (free) vs Aurora AlphaNew provider