Grok 4.1 Fast vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Grok 4.1 Fast by xAI and o3 by OpenAI are evenly matched across 14 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 o3's 1380, while Grok 4.1 Fast scores 87.0% on MMLU-Pro compared to o3's 84.0%.
Coding: In coding, o3 scores 90.0% on HumanEval+ compared to Grok 4.1 Fast's 88.0%, while o3 scores 69.1% on SWE-bench Verified compared to Grok 4.1 Fast's 60.0%, while o3 scores 70.0% on LiveCodeBench compared to Grok 4.1 Fast's 62.0%.
Math: In math, o3 scores 96.0% on MATH compared to Grok 4.1 Fast's 89.0%, while o3 scores 98.5% on GSM8K compared to Grok 4.1 Fast's 96.0%.
Reasoning: In reasoning, o3 scores 83.3% on GPQA Diamond compared to Grok 4.1 Fast's 72.0%, while o3 scores 75.7% on ARC-AGI compared to Grok 4.1 Fast's 48.0%.
Context: In context, Grok 4.1 Fast scores 256K on Context Length compared to o3's 200K.
Pricing Comparison
Grok 4.1 Fast costs $0.20/1M input tokens and $0.50/1M output tokens, while o3 costs $2.0/1M input and $8.0/1M output. Grok 4.1 Fast is the more affordable option for API usage.
Speed Comparison
Grok 4.1 Fast generates output at 120 tok/s compared to o3's 40 tok/s, and the time to first token is 200 ms for Grok 4.1 Fast versus 800 ms for o3. Grok 4.1 Fast delivers faster throughput.
Verdict
For developers prioritizing general intelligence and affordability and speed, Grok 4.1 Fast has the edge. For those who value coding and math, o3 is the stronger choice.
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Grok 4.1 Fast vs o3 — FAQ
Which is better, Grok 4.1 Fast or o3?
Grok 4.1 Fast and o3 are evenly matched across benchmarks. The best choice depends on your specific priorities such as coding ability, speed, or pricing.
How does Grok 4.1 Fast compare to o3 for coding?
o3 is better for coding, scoring 69.1% on SWE-bench Verified compared to 60.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Grok 4.1 Fast cheaper than o3?
Yes, Grok 4.1 Fast is cheaper. Grok 4.1 Fast costs $0.20/1M input and $0.50/1M output tokens. o3 costs $2.0/1M input and $8.0/1M output tokens.
Which is faster, Grok 4.1 Fast or o3?
Grok 4.1 Fast is faster, generating output at 120 tok/s compared to 40 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Grok 4.1 Fast vs o3 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.