Aurora AlphavsGrok 4 Fast (free)
Grok 4 Fast (free) has a larger context window than Aurora Alpha (2.0M tokens vs 128K tokens).
| Spec | Aurora Alpha | Grok 4 Fast (free) |
|---|---|---|
| Input price | Free | Free |
| Output price | Free | Free |
| Context window | 128K tokens | 2.0M tokens |
| Free API (OpenRouter) | No | No |
| Released | Feb 2026 | Sep 2025 |
Our Verdict
Aurora Alpha
Grok 4 Fast (free)
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
Aurora Alpha
Input
$0.000
Output
$0.000
Grok 4 Fast (free)
Input
$0.000
Output
$0.000
Writing DNA
Style Comparison
Similarity
41%
Aurora Alpha uses 10.0x more emoji
Aurora Alpha
Grok 4 Fast (free)
52%Vocabulary65%
21wSentence Length13w
0.43Hedging0.56
6.3Bold1.4
2.2Lists2.5
0.10Emoji0.00
0.69Headings1.58
0.16Transitions0.28
Based on 22 + 14 text responses
Research
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FAQ
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