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Spec
Grok 3
GPT-4o
Intelligence index↑ better
Winner74
72
Speed↑ better
75 tok/s
Winner110 tok/s
Time to first token↓ better
0.6 s
Winner0.4 s
Context window↑ better
Winner1M
128k
Max output↑ better
16k
Winner16k
Input price↓ better
$3.00 / 1M tokens
Winner$2.50 / 1M tokens
Output price↓ better
$15.00 / 1M tokens
Winner$10.00 / 1M tokens
Blended price↓ better
$6.00 / 1M tokens
Winner$4.38 / 1M tokens
License
Proprietary
Proprietary
Input modalities
text, image
text, image, audio
Output modalities
text
text, audio
Benchmark showdown
MMLU
Grok 3
88.0
GPT-4o
88.7
MMLU Pro
Grok 3
76.0
GPT-4o
73.3
GPQA
Grok 3
62.0
GPT-4o
53.1
MATH
Grok 3
88.5
GPT-4o
76.6
HumanEval
Grok 3
90.0
GPT-4o
90.2
Strengths, weaknesses and best-for
Grok 3
Strengths
- Live X data
- 1M context
- Strong reasoning mode
Weaknesses
- Smaller ecosystem
- Less tool-use tooling
Best for
- Real-time research
- Social-aware apps
GPT-4o
Strengths
- Strong multimodal
- Voice-native
- Mature ecosystem
Weaknesses
- Weaker than GPT-5.5 on reasoning
- Smaller context vs newer models
Best for
- General-purpose chat
- Voice apps
- Vision tasks
Quick verdict
- Pick Grok 3 if you want it smarter and longer context.
- Pick GPT-4o if you want it faster and cheaper.
Auto-generated from the spec sheet. Always validate on your own evals.
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