Bert-Nebulon AlphavsGrok 4.20 Beta
Grok 4.20 Beta is the newer model, released after Bert-Nebulon Alpha.
| Spec | Bert-Nebulon Alpha | Grok 4.20 Beta |
|---|---|---|
| Input price | — | $2/M tokens |
| Output price | — | $6/M tokens |
| Context window | — | 2.0M tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Mar 2026 |
Our Verdict
Grok 4.20 Beta
Bert-Nebulon AlphaRunner-up
Not enough votes to call it. On the specs, Grok 4.20 Beta has the edge: bigger model tier, newer, bigger context window, major provider backing.
Slight edge
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
Bert-Nebulon Alpha
Input
—
Output
—
Grok 4.20 Beta
Input
$2.00
Output
$6.00
Where to run it
1 host
Bert-Nebulon Alpha
No hosts listed on OpenRouter.
Grok 4.20 Beta1 host
Per million tokens. Prices and uptime via OpenRouter, checked 13 Sep 2026.
Writing DNA
Style Comparison
Similarity
32%
Bert-Nebulon Alpha uses 42.4x more emoji
Bert-Nebulon Alpha
Grok 4.20 Beta
55%Vocabulary57%
21wSentence Length20w
0.28Hedging0.35
10.9Bold4.2
5.7Lists3.7
0.42Emoji0.00
1.40Headings0.62
0.04Transitions0.14
Based on 14 + 23 text responses
Research
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