GPT-5.1-CodexvsGrok 3 Thinking
GPT-5.1-Codex has a larger context window than Grok 3 Thinking (400K tokens vs 128K tokens).
| Spec | GPT-5.1-Codex | 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-Codex
Grok 3 ThinkingRunner-up
Not enough votes to call it. On the specs, GPT-5.1-Codex has the edge: newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1-Codex
Input
$1.25
Output
$10.00
Grok 3 Thinking
Input
—
Output
—
Where to run it
1 host
GPT-5.1-Codex1 host
Grok 3 Thinking
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
47%
Grok 3 Thinking uses 2.8x more hedging
GPT-5.1-Codex
Grok 3 Thinking
70%Vocabulary46%
17wSentence Length19w
0.39Hedging1.11
3.4Bold3.3
3.5Lists2.6
0.00Emoji0.00
0.50Headings0.64
0.38Transitions0.25
Based on 14 + 6 text responses
Research
What we learned reading every model
FAQ
Common questions
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