Grok 3 ThinkingvsOpenAI o4-mini
OpenAI o4-mini is the newer model, released after Grok 3 Thinking.
| Spec | Grok 3 Thinking | OpenAI o4-mini |
|---|---|---|
| Input price | — | $1.1/M tokens |
| Output price | — | $4.4/M tokens |
| Context window | 128K tokens | — |
| Weights | — | Closed |
| Free API (OpenRouter) | — | No |
| Released | Feb 2025 | Apr 2025 |
Our Verdict
Grok 3 Thinking
OpenAI o4-mini
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
Grok 3 Thinking
Input
—
Output
—
OpenAI o4-mini
Input
$1.10
Output
$4.40
Where to run it
1 host
Grok 3 Thinking
No hosts listed on OpenRouter.
OpenAI o4-mini1 host
Per million tokens. Prices and uptime via OpenRouter, checked 13 Sep 2026.
Writing DNA
Style Comparison
Similarity
36%
Grok 3 Thinking uses 334.3x more bold
Grok 3 Thinking
OpenAI o4-mini
46%Vocabulary73%
19wSentence Length21w
1.11Hedging0.39
3.3Bold0.0
2.6Lists2.0
0.00Emoji0.00
0.64Headings0.00
0.25Transitions0.05
Based on 6 + 17 text responses
Research
What we learned reading every model
FAQ
Common questions
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