What is the difference between ChatGPT-4o (March 2025) and Grok 3?

ChatGPT-4o (March 2025) is developed by OpenAI while Grok 3 is developed by xAI. ChatGPT-4o (March 2025) has a 128K token context window vs Grok 3's 128K. These results are based on blind head-to-head voting across 32 challenges.

Which is better, ChatGPT-4o (March 2025) or Grok 3?

Based on 2 community votes on Rival, ChatGPT-4o (March 2025) and Grok 3 are closely matched with similar win rates. The better choice depends on your specific use case. Compare their real outputs side-by-side across 32 challenges to decide.

How are ChatGPT-4o (March 2025) vs Grok 3 votes collected on Rival?

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 2 votes have been collected for this pair across 32 challenges. All vote data is part of Rival's open dataset.

What is the difference between ChatGPT-4o (March 2025) and Grok 3?

ChatGPT-4o (March 2025) is developed by OpenAI while Grok 3 is developed by xAI. ChatGPT-4o (March 2025) has a 128K token context window vs Grok 3's 128K. These results are based on blind head-to-head voting across 32 challenges.

Which is better, ChatGPT-4o (March 2025) or Grok 3?

Based on 2 community votes on Rival, ChatGPT-4o (March 2025) and Grok 3 are closely matched with similar win rates. The better choice depends on your specific use case. Compare their real outputs side-by-side across 32 challenges to decide.

How are ChatGPT-4o (March 2025) vs Grok 3 votes collected on Rival?

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 2 votes have been collected for this pair across 32 challenges. All vote data is part of Rival's open dataset.

ChatGPT-4o (March 2025) vs Grok 3: Which Is Better?

Updated Mar 2025

Our Verdict

ChatGPT-4o (March 2025)

Grok 3

Genuinely even. Both are strong choices.

Too close to call

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

Grok 3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

43%

ChatGPT-4o (March 2025) uses 24.0x more emoji

ChatGPT-4o (March 2025)

Grok 3

55%Vocabulary49%

24wSentence Length18w

0.52Hedging0.94

3.3Bold2.5

6.0Lists3.0

0.94Emoji0.04

0.63Headings0.65

0.05Transitions0.08

Based on 15 + 17 text responses

Research

What we learned reading every model

ChatGPT-4o (March 2025) and Grok 3 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 Llama 4 MaverickNew provider

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

ChatGPT-4o (March 2025) vs Gemini 2.5 Pro (I/O Edition)New provider

Updated Mar 2025

Our Verdict

ChatGPT-4o (March 2025)

Grok 3

Genuinely even. Both are strong choices.

Too close to call

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

Grok 3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

43%

ChatGPT-4o (March 2025) uses 24.0x more emoji

ChatGPT-4o (March 2025)

Grok 3

55%Vocabulary49%

24wSentence Length18w

0.52Hedging0.94

3.3Bold2.5

6.0Lists3.0

0.94Emoji0.04

0.63Headings0.65

0.05Transitions0.08

Based on 15 + 17 text responses

Research

What we learned reading every model

ChatGPT-4o (March 2025) and Grok 3 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 Llama 4 MaverickNew provider

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

ChatGPT-4o (March 2025) vs Gemini 2.5 Pro (I/O Edition)New provider