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Grok Code Fast 1 vs GPT OSS 120B

Compare Grok Code Fast 1 by xAI against GPT OSS 120B by OpenAI, in 17 community votes, grok code fast 1 wins 54% of head-to-head duels, context windows of 256K vs 131K, tested across 49 shared challenges. Updated April 2026.

Which is better, Grok Code Fast 1 or GPT OSS 120B?

Grok Code Fast 1 is the better choice overall, winning 54% of 17 blind community votes on Rival. Grok Code Fast 1 costs $0.2/M input tokens vs $0.18/M for GPT OSS 120B. Context windows: 256K vs 131K tokens. Compare their real outputs side by side below.

Key Differences Between Grok Code Fast 1 and GPT OSS 120B

Grok Code Fast 1 is made by xai while GPT OSS 120B is from openai. Grok Code Fast 1 has a 256K token context window compared to GPT OSS 120B's 131K. On pricing, Grok Code Fast 1 costs $0.2/M input tokens vs $0.18/M for GPT OSS 120B. In community voting, In 17 community votes, Grok Code Fast 1 wins 54% of head-to-head duels.

In 17 community votes, Grok Code Fast 1 wins 54% of head-to-head duels. Grok Code Fast 1 leads in Web Design, while GPT OSS 120B leads in Reasoning. Based on blind community voting from the Rival open dataset of 17+ human preference judgments for this pair.

Reasoning: GPT OSS 120B wins 63% of votes
Web Design: Grok Code Fast 1 wins 100% of votes
Image Generation: Grok Code Fast 1 and GPT OSS 120B are tied
Our Verdict
Grok Code Fast 1
Grok Code Fast 1Winner
GPT OSS 120B
GPT OSS 120BRunner-up

Grok Code Fast 1 has the edge overall. In 17 blind votes, Grok Code Fast 1 wins 54% of the time.

Pick Grok Code Fast 1 for Web Design. Pick GPT OSS 120B for Reasoning.

Slight edge
Writing DNA

Style Comparison

Similarity
95%

Grok Code Fast 1 uses 3.5x more hedging

Grok Code Fast 1
GPT OSS 120B
60%Vocabulary52%
17wSentence Length19w
0.97Hedging0.28
2.8Bold7.4
2.5Lists1.8
0.06Emoji0.15
0.89Headings0.73
0.11Transitions0.17
Based on 23 + 21 text responses
vs

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Grok Code Fast 1GPT OSS 120B

Some models write identically. You are paying for the brand.

178 models fingerprinted across 32 writing dimensions. Free research.

Model Similarity Index

185x

price gap between models that write identically

178

models

12

clone pairs

32

dimensions

Devstral M / S
95.7%
Qwen3 Coder / Flash
95.6%
GPT-5.4 / Mini
93.3%
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