Grok 3 vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
o3 by OpenAI wins on 9 of 15 benchmarks against Grok 3 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 3 scores 1402 on Chatbot Arena ELO compared to o3's 1380, while o3 scores 84.0% on MMLU-Pro compared to Grok 3's 74.0%.
Coding: In coding, o3 scores 90.0% on HumanEval+ compared to Grok 3's 82.0%, while o3 scores 69.1% on SWE-bench Verified compared to Grok 3's 42.0%, while Grok 3 scores 79.4% on LiveCodeBench compared to o3's 70.0%.
Math: In math, o3 scores 96.0% on MATH compared to Grok 3's 82.0%, while o3 scores 98.5% on GSM8K compared to Grok 3's 93.0%, while o3 scores 98.4% on AIME 2025 compared to Grok 3's 93.3%.
Reasoning: In reasoning, Grok 3 scores 84.6% on GPQA Diamond compared to o3's 83.3%, while o3 scores 75.7% on ARC-AGI compared to Grok 3's 28.0%.
Context: In context, Grok 3 scores 1.0M on Context Length compared to o3's 200K.
Pricing Comparison
Grok 3 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 3 generates output at 65 tok/s compared to o3's 40 tok/s, and the time to first token is 400 ms for Grok 3 versus 800 ms for o3. Grok 3 delivers faster throughput.
Verdict
For developers prioritizing general intelligence and speed, Grok 3 has the edge. For those who value coding and math and affordability, o3 is the stronger choice.
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Grok 3 vs o3 — FAQ
Which is better, Grok 3 or o3?
o3 wins on more benchmarks overall (9 vs 6). However, the best choice depends on your specific needs — each model excels in different areas.
How does Grok 3 compare to o3 for coding?
o3 is better for coding, scoring 69.1% on SWE-bench Verified compared to 42.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Grok 3 cheaper than o3?
Yes, o3 is cheaper. Grok 3 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 3 or o3?
Grok 3 is faster, generating output at 65 tok/s compared to 40 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Grok 3 vs o3 comparison cover?
This comparison covers 15 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.