GPT-5 vs Grok 4.1 Fast
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5 by OpenAI wins on 8 of 14 benchmarks against Grok 4.1 Fast by xAI, which leads on 6. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, Grok 4.1 Fast scores 1482 on Chatbot Arena ELO compared to GPT-5's 1390, while Grok 4.1 Fast scores 87.0% on MMLU-Pro compared to GPT-5's 86.0%.
Coding: In coding, GPT-5 scores 92.0% on HumanEval+ compared to Grok 4.1 Fast's 88.0%, while GPT-5 scores 74.9% on SWE-bench Verified compared to Grok 4.1 Fast's 60.0%, while GPT-5 scores 78.0% on LiveCodeBench compared to Grok 4.1 Fast's 62.0%.
Math: In math, GPT-5 scores 94.6% on MATH compared to Grok 4.1 Fast's 89.0%, while GPT-5 scores 98.0% on GSM8K compared to Grok 4.1 Fast's 96.0%.
Reasoning: In reasoning, GPT-5 scores 87.3% on GPQA Diamond compared to Grok 4.1 Fast's 72.0%, while GPT-5 scores 50.0% on ARC-AGI compared to Grok 4.1 Fast's 48.0%.
Context: In context, GPT-5 scores 400K on Context Length compared to Grok 4.1 Fast's 256K.
Pricing Comparison
GPT-5 costs $1.3/1M input tokens and $10.0/1M output tokens, while Grok 4.1 Fast costs $0.20/1M input and $0.50/1M output. Grok 4.1 Fast is the more affordable option for API usage.
Speed Comparison
GPT-5 generates output at 100 tok/s compared to Grok 4.1 Fast's 120 tok/s, and the time to first token is 320 ms for GPT-5 versus 200 ms for Grok 4.1 Fast. Grok 4.1 Fast delivers faster throughput.
Verdict
For developers prioritizing coding and math, GPT-5 has the edge. For those who value general intelligence and affordability and speed, Grok 4.1 Fast is the stronger choice.
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GPT-5 vs Grok 4.1 Fast — FAQ
Which is better, GPT-5 or Grok 4.1 Fast?
GPT-5 wins on more benchmarks overall (8 vs 6). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5 compare to Grok 4.1 Fast for coding?
GPT-5 is better for coding, scoring 74.9% on SWE-bench Verified compared to 60.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is GPT-5 cheaper than Grok 4.1 Fast?
Yes, Grok 4.1 Fast is cheaper. GPT-5 costs $1.3/1M input and $10.0/1M output tokens. Grok 4.1 Fast costs $0.20/1M input and $0.50/1M output tokens.
Which is faster, GPT-5 or Grok 4.1 Fast?
Grok 4.1 Fast is faster, generating output at 120 tok/s compared to 100 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GPT-5 vs Grok 4.1 Fast comparison cover?
This comparison covers 14 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, LiveCodeBench, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.