GPT-5.1-Codex-MinivsGrok 4.20 Beta
GPT-5.1-Codex-Mini is cheaper than Grok 4.20 Beta at $1.5/M vs $2/M input tokens.
| Spec | GPT-5.1-Codex-Mini | Grok 4.20 Beta |
|---|---|---|
| Input price | $1.5/M tokens | $2/M tokens |
| Output price | $6/M tokens | $6/M tokens |
| Context window | 400K tokens | 2.0M tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Mar 2026 |
Our Verdict
Grok 4.20 Beta
GPT-5.1-Codex-MiniRunner-up
Not enough votes to call it. On the specs, Grok 4.20 Beta has the edge: newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1-Codex-Mini
Input
$1.50
1.3× cheaper
Output
$6.00
Grok 4.20 Beta
Input
$2.00
Output
$6.00
Where to run it
2 hosts
GPT-5.1-Codex-Mini1 host
Grok 4.20 Beta1 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
52%
Grok 4.20 Beta uses 5.9x more headings
GPT-5.1-Codex-Mini
Grok 4.20 Beta
68%Vocabulary57%
19wSentence Length20w
0.64Hedging0.35
2.7Bold4.2
2.6Lists3.7
0.00Emoji0.00
0.10Headings0.62
0.06Transitions0.14
Based on 17 + 23 text responses
Research
What we learned reading every model
FAQ
Common questions
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