GPT-5.1vsGrok 3 Thinking
GPT-5.1 has a larger context window than Grok 3 Thinking (400K tokens vs 128K tokens).
| Spec | GPT-5.1 | Grok 3 Thinking |
|---|---|---|
| Input price | $1.25/M tokens | — |
| Output price | $10/M tokens | — |
| Context window | 400K tokens | 128K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | — |
| Released | Nov 2025 | Feb 2025 |
Our Verdict
GPT-5.1
Grok 3 ThinkingRunner-up
Not enough votes to call it. On the specs, GPT-5.1 has the edge: newer, bigger context window.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
GPT-5.1
Input
$1.25
Output
$10.00
Grok 3 Thinking
Input
—
Output
—
Where to run it
2 hosts
Grok 3 Thinking
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
42%
Grok 3 Thinking uses 9.2x more transitions
GPT-5.1
Grok 3 Thinking
62%Vocabulary46%
19wSentence Length19w
0.29Hedging1.11
3.5Bold3.3
7.2Lists2.6
0.00Emoji0.00
0.61Headings0.64
0.03Transitions0.25
Based on 14 + 6 text responses
Research
What we learned reading every model
FAQ
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