What is the difference between GPT OSS 120B and Kimi K2 Thinking?

GPT OSS 120B is developed by OpenAI while Kimi K2 Thinking is developed by Moonshot AI. GPT OSS 120B has a 131K token context window vs Kimi K2 Thinking's 262K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GPT OSS 120B or Kimi K2 Thinking?

It depends on your use case. GPT OSS 120B and Kimi K2 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does GPT OSS 120B cost compared to Kimi K2 Thinking?

GPT OSS 120B costs $0.18/M input tokens and Kimi K2 Thinking costs $0.6/M input tokens. GPT OSS 120B is $0.42/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 GPT OSS 120B and Kimi K2 Thinking on Rival?

This page shows a side-by-side comparison of GPT OSS 120B and Kimi K2 Thinking 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 GPT OSS 120B and Kimi K2 Thinking?

GPT OSS 120B is developed by OpenAI while Kimi K2 Thinking is developed by Moonshot AI. GPT OSS 120B has a 131K token context window vs Kimi K2 Thinking's 262K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GPT OSS 120B or Kimi K2 Thinking?

It depends on your use case. GPT OSS 120B and Kimi K2 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does GPT OSS 120B cost compared to Kimi K2 Thinking?

GPT OSS 120B costs $0.18/M input tokens and Kimi K2 Thinking costs $0.6/M input tokens. GPT OSS 120B is $0.42/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 GPT OSS 120B and Kimi K2 Thinking on Rival?

This page shows a side-by-side comparison of GPT OSS 120B and Kimi K2 Thinking 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.

Updated Nov 2025

GPT OSS 120BvsKimi K2 Thinking

GPT OSS 120B is cheaper than Kimi K2 Thinking at $0.18/M vs $0.6/M input tokens.

GPT OSS 120B and Kimi K2 Thinking compared across 53 shared prompts
Spec	GPT OSS 120B	Kimi K2 Thinking
Input price	$0.18/M tokens	$0.6/M tokens
Output price	$0.8/M tokens	$2.5/M tokens
Context window	131K tokens	262K tokens
Released	Aug 2025	Nov 2025
HLE	Matches/exceeds o4-mini	State-of-the-art

Our Verdict

GPT OSS 120B

Kimi K2 Thinking

Not enough votes to call it. On the specs, nothing separates them.

GPT OSS 120B costs 3.1x less per token.

Too close to call

What do GPT OSS 120B and Kimi K2 Thinking say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

GPT OSS 120B

Input

$0.18

3.3× cheaper

Output

$0.80

3.1× cheaper

Kimi K2 Thinking

Input

$0.60

Output

$2.50

GPT OSS 120B is cheaper on both — 3.3× input, 3.1× output

Writing DNA

Style Comparison

Similarity

47%

GPT OSS 120B uses 15.4x more emoji

GPT OSS 120B

Kimi K2 Thinking

52%Vocabulary57%

19wSentence Length26w

0.28Hedging0.36

7.4Bold5.8

1.8Lists6.0

0.15Emoji0.00

0.73Headings0.56

0.17Transitions0.06

Based on 21 + 14 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT OSS 120B vs Ox AlphaNew provider

GPT OSS 120B vs MiniMax M3New provider

GPT OSS 120B vs Claude Opus 4New provider

GPT OSS 120B vs Claude Opus 4.1New provider

GPT OSS 120B vs Horizon AlphaNew provider

GPT OSS 120B vs Horizon BetaNew provider

GPT OSS 120B vs Hunter AlphaNew provider

GPT OSS 120B vs InklingNew provider

Updated Nov 2025

GPT OSS 120BvsKimi K2 Thinking

GPT OSS 120B is cheaper than Kimi K2 Thinking at $0.18/M vs $0.6/M input tokens.

GPT OSS 120B and Kimi K2 Thinking compared across 53 shared prompts
Spec	GPT OSS 120B	Kimi K2 Thinking
Input price	$0.18/M tokens	$0.6/M tokens
Output price	$0.8/M tokens	$2.5/M tokens
Context window	131K tokens	262K tokens
Released	Aug 2025	Nov 2025
HLE	Matches/exceeds o4-mini	State-of-the-art

Our Verdict

GPT OSS 120B

Kimi K2 Thinking

Not enough votes to call it. On the specs, nothing separates them.

GPT OSS 120B costs 3.1x less per token.

Too close to call

What do GPT OSS 120B and Kimi K2 Thinking say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

GPT OSS 120B

Input

$0.18

3.3× cheaper

Output

$0.80

3.1× cheaper

Kimi K2 Thinking

Input

$0.60

Output

$2.50

GPT OSS 120B is cheaper on both — 3.3× input, 3.1× output

Writing DNA

Style Comparison

Similarity

47%

GPT OSS 120B uses 15.4x more emoji

GPT OSS 120B

Kimi K2 Thinking

52%Vocabulary57%

19wSentence Length26w

0.28Hedging0.36

7.4Bold5.8

1.8Lists6.0

0.15Emoji0.00

0.73Headings0.56

0.17Transitions0.06

Based on 21 + 14 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT OSS 120B vs Ox AlphaNew provider

GPT OSS 120B vs MiniMax M3New provider

GPT OSS 120B vs Claude Opus 4New provider

GPT OSS 120B vs Claude Opus 4.1New provider

GPT OSS 120B vs Horizon AlphaNew provider

GPT OSS 120B vs Horizon BetaNew provider

GPT OSS 120B vs Hunter AlphaNew provider

GPT OSS 120B vs InklingNew provider