Grok 4 vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Grok 4 by xAI and o3 by OpenAI are evenly matched across 15 benchmarks. 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 scores 1430 on Chatbot Arena ELO compared to o3's 1380, while Grok 4 scores 87.0% on MMLU-Pro compared to o3's 84.0%.
Coding: In coding, both score 90.0% on HumanEval+, while Grok 4 scores 72.0% on SWE-bench Verified compared to o3's 69.1%, while o3 scores 70.0% on LiveCodeBench compared to Grok 4's 65.0%.
Math: In math, o3 scores 96.0% on MATH compared to Grok 4's 91.0%, while o3 scores 98.5% on GSM8K compared to Grok 4's 97.0%, while o3 scores 98.4% on AIME 2025 compared to Grok 4's 93.0%.
Reasoning: In reasoning, Grok 4 scores 87.0% on GPQA Diamond compared to o3's 83.3%, while o3 scores 75.7% on ARC-AGI compared to Grok 4's 50.0%.
Context: In context, Grok 4 scores 256K on Context Length compared to o3's 200K.
Pricing Comparison
Grok 4 costs $3.0/1M input tokens and $15.0/1M output tokens, while o3 costs $2.0/1M input and $8.0/1M output. o3 is the more affordable option for API usage.
Speed Comparison
Grok 4 generates output at 55 tok/s compared to o3's 40 tok/s, and the time to first token is 500 ms for Grok 4 versus 800 ms for o3. Grok 4 delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence and speed, Grok 4 has the edge. For those who value math and affordability, o3 is the stronger choice.
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Grok 4 vs o3 — FAQ
Which is better, Grok 4 or o3?
Grok 4 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 compare to o3 for coding?
Grok 4 is better for coding, scoring 72.0% on SWE-bench Verified compared to 69.1%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Grok 4 cheaper than o3?
Yes, o3 is cheaper. Grok 4 costs $3.0/1M input and $15.0/1M output tokens. o3 costs $2.0/1M input and $8.0/1M output tokens.
Which is faster, Grok 4 or o3?
Grok 4 is faster, generating output at 55 tok/s compared to 40 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Grok 4 vs o3 comparison cover?
This comparison covers 15 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.