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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
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Grok Code Fast 1GPT OSS 120B

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