Grok 4 vs Grok 4.1 Fast
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Grok 4 by xAI wins on 7 of 14 benchmarks against Grok 4.1 Fast by xAI, which leads on 5. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from the AI Value Index.
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%.
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 wins on more benchmarks overall (7 vs 5). However, the best choice depends on your specific needs — each model excels in different areas.
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 14 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.