What is the difference between GPT-4o (Omni) and Kimi K2?

GPT-4o (Omni) is developed by OpenAI while Kimi K2 is developed by Moonshot AI. in 5 community votes on Rival, Kimi K2 wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 54 challenges.

Which is better, GPT-4o (Omni) or Kimi K2?

Based on 5 community votes on Rival, Kimi K2 wins 100% of head-to-head matchups against GPT-4o (Omni). Kimi K2 is strongest in Conversation.

How much does GPT-4o (Omni) cost compared to Kimi K2?

GPT-4o (Omni) costs $2.5/M input tokens and Kimi K2 costs $0.57/M input tokens. Kimi K2 is $1.93/M cheaper per input. Kimi K2 also wins more often in community votes, making it the better value.

How are GPT-4o (Omni) vs Kimi K2 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. 5 votes have been collected for this pair across 54 challenges. All vote data is part of Rival's open dataset.

What is the difference between GPT-4o (Omni) and Kimi K2?

GPT-4o (Omni) is developed by OpenAI while Kimi K2 is developed by Moonshot AI. in 5 community votes on Rival, Kimi K2 wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 54 challenges.

Which is better, GPT-4o (Omni) or Kimi K2?

Based on 5 community votes on Rival, Kimi K2 wins 100% of head-to-head matchups against GPT-4o (Omni). Kimi K2 is strongest in Conversation.

How much does GPT-4o (Omni) cost compared to Kimi K2?

GPT-4o (Omni) costs $2.5/M input tokens and Kimi K2 costs $0.57/M input tokens. Kimi K2 is $1.93/M cheaper per input. Kimi K2 also wins more often in community votes, making it the better value.

How are GPT-4o (Omni) vs Kimi K2 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. 5 votes have been collected for this pair across 54 challenges. All vote data is part of Rival's open dataset.

GPT-4o (Omni) vs Kimi K2: Which Is Better?

Updated Jul 2025

Our Verdict

Kimi K2Winner

GPT-4o (Omni)Runner-up

Pick Kimi K2. In 5 blind votes, Kimi K2 wins 100% of the time. That's not luck.

Kimi K2 particularly excels in Conversation. Kimi K2 is 4.3x cheaper per token — worth considering if cost matters.

Clear winner

API pricing

Cost per 1M tokens

GPT-4o (Omni)

Input

$2.50

Output

$10.00

Kimi K2

Input

$0.57

4.4× cheaper

Output

$2.30

4.3× cheaper

Kimi K2 is cheaper on both — 4.4× input, 4.3× output

Writing DNA

Style Comparison

Similarity

33%

Kimi K2 uses 27.3x more emoji

GPT-4o (Omni)

Kimi K2

54%Vocabulary63%

18wSentence Length19w

0.72Hedging0.35

7.3Bold4.2

5.6Lists3.6

0.03Emoji0.68

1.40Headings0.61

0.26Transitions0.06

Based on 24 + 22 text responses

Research

What we learned reading every model

GPT-4o (Omni) and Kimi K2 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

Kimi K2 vs Llama 4 MaverickNew provider

Kimi K2 vs GPT-5Cross-provider

GPT-4o (Omni) vs MiniMax M3New provider

Updated Jul 2025

Our Verdict

Kimi K2Winner

GPT-4o (Omni)Runner-up

Pick Kimi K2. In 5 blind votes, Kimi K2 wins 100% of the time. That's not luck.

Kimi K2 particularly excels in Conversation. Kimi K2 is 4.3x cheaper per token — worth considering if cost matters.

Clear winner

API pricing

Cost per 1M tokens

GPT-4o (Omni)

Input

$2.50

Output

$10.00

Kimi K2

Input

$0.57

4.4× cheaper

Output

$2.30

4.3× cheaper

Kimi K2 is cheaper on both — 4.4× input, 4.3× output

Writing DNA

Style Comparison

Similarity

33%

Kimi K2 uses 27.3x more emoji

GPT-4o (Omni)

Kimi K2

54%Vocabulary63%

18wSentence Length19w

0.72Hedging0.35

7.3Bold4.2

5.6Lists3.6

0.03Emoji0.68

1.40Headings0.61

0.26Transitions0.06

Based on 24 + 22 text responses

Research

What we learned reading every model

GPT-4o (Omni) and Kimi K2 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

Kimi K2 vs Llama 4 MaverickNew provider

Kimi K2 vs GPT-5Cross-provider

GPT-4o (Omni) vs MiniMax M3New provider