Grok Code Fast 1
Nothing here. The model returned empty. We stared at it for a while.
Grok Code Fast 1 vs GPT-5
Compare Grok Code Fast 1 by xAI against GPT-5 by OpenAI, in 175 community votes, gpt-5 wins 78% of head-to-head duels, context windows of 256K vs 400K, tested across 47 shared challenges. Updated April 2026.
Which is better, Grok Code Fast 1 or GPT-5?
GPT-5 is the better choice overall, winning 78% of 175 blind community votes on Rival. Grok Code Fast 1 costs $0.2/M input tokens vs $1.25/M for GPT-5. Context windows: 256K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Grok Code Fast 1 and GPT-5
Grok Code Fast 1 is made by xai while GPT-5 is from openai. Grok Code Fast 1 has a 256K token context window compared to GPT-5's 400K. On pricing, Grok Code Fast 1 costs $0.2/M input tokens vs $1.25/M for GPT-5. In community voting, In 175 community votes, GPT-5 wins 78% of head-to-head duels.
In 175 community votes, GPT-5 wins 78% of head-to-head duels. Grok Code Fast 1 leads in Conversation, Analysis, while GPT-5 leads in Reasoning, Image Generation, Web Design. Based on blind community voting from the Rival open dataset of 175+ human preference judgments for this pair.
Reasoning: GPT-5 wins 67% of votes
Image Generation: GPT-5 wins 95% of votes
Web Design: GPT-5 wins 89% of votes
Conversation: Grok Code Fast 1 wins 69% of votes
Analysis: Grok Code Fast 1 wins 60% of votes
Our Verdict
GPT-5Winner
Grok Code Fast 1Runner-up
Pick GPT-5. In 175 blind votes, GPT-5 wins 78% of the time. That's not luck.
Pick Grok Code Fast 1 for Conversation, Analysis. Pick GPT-5 for Image Generation, Web Design, Reasoning. Grok Code Fast 1 is 6.7x cheaper per token — worth considering if cost matters.
Clear winner
Writing DNA
Style Comparison
Similarity
99%
Grok Code Fast 1 uses 6.0x more emoji
Grok Code Fast 1
GPT-5
60%Vocabulary65%
17wSentence Length13w
0.97Hedging0.20
2.8Bold0.2
2.5Lists4.6
0.06Emoji0.00
0.89Headings0.16
0.11Transitions0.03
Based on 23 + 16 text responses
vsAsk them anything yourself
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%
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
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