Grok 4 vs Grok 4.1 Fast
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Grok 4 by xAI and Grok 4.1 Fast by xAI are evenly matched across 16 benchmarks. 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 Grok 4's 1430, while both score 87.0% on MMLU-Pro.
Coding: In coding, Grok 4 scores 90.0% on HumanEval+ compared to Grok 4.1 Fast's 88.0%, while Grok 4 scores 72.0% on SWE-bench Verified compared to Grok 4.1 Fast's 60.0%, while Grok 4 scores 65.0% on LiveCodeBench compared to Grok 4.1 Fast's 62.0%, while Grok 4.1 Fast scores 1114 on Design Arena ELO compared to Grok 4's 1073, while Grok 4.1 Fast scores 1147 on Website Arena ELO compared to Grok 4's 1056.
Math: In math, Grok 4 scores 91.0% on MATH compared to Grok 4.1 Fast's 89.0%, while Grok 4 scores 97.0% on GSM8K compared to Grok 4.1 Fast's 96.0%.
Reasoning: In reasoning, Grok 4 scores 87.0% on GPQA Diamond compared to Grok 4.1 Fast's 72.0%, while Grok 4 scores 50.0% on ARC-AGI compared to Grok 4.1 Fast's 48.0%.
Context: In context, both score 256K on Context Length.
Pricing Comparison
Grok 4 costs $3.0/1M input tokens and $15.0/1M 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
Grok 4 generates output at 55 tok/s compared to Grok 4.1 Fast's 120 tok/s, and the time to first token is 500 ms for Grok 4 versus 200 ms for Grok 4.1 Fast. Grok 4.1 Fast delivers faster throughput.
Verdict
For developers prioritizing coding and math, Grok 4 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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Grok 4 vs Grok 4.1 Fast — FAQ
Which is better, Grok 4 or Grok 4.1 Fast?
Grok 4 and Grok 4.1 Fast are evenly matched across benchmarks. The best choice depends on your specific priorities such as coding ability, speed, or pricing.
How does Grok 4 compare to Grok 4.1 Fast for coding?
Grok 4 is better for coding, scoring 72.0% on SWE-bench Verified compared to 60.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Grok 4 cheaper than Grok 4.1 Fast?
Yes, Grok 4.1 Fast is cheaper. Grok 4 costs $3.0/1M input and $15.0/1M output tokens. Grok 4.1 Fast costs $0.20/1M input and $0.50/1M output tokens.
Which is faster, Grok 4 or Grok 4.1 Fast?
Grok 4.1 Fast is faster, generating output at 120 tok/s compared to 55 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Grok 4 vs Grok 4.1 Fast comparison cover?
This comparison covers 16 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, SWE-bench Verified, GPQA Diamond, Output Speed, Time to First Token, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.