GPT-5.1 ChatvsGrok 4
GPT-5.1 Chat is cheaper than Grok 4 at $1.25/M vs $3/M input tokens.
| Spec | GPT-5.1 Chat | Grok 4 |
|---|---|---|
| Input price | $1.25/M tokens | $3/M tokens |
| Output price | $10/M tokens | $15/M tokens |
| Context window | 128K tokens | 256K tokens |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Jul 2025 |
Our Verdict
GPT-5.1 Chat
Grok 4
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
GPT-5.1 Chat
Input
$1.25
2.4× cheaper
Output
$10.00
1.5× cheaper
Grok 4
Input
$3.00
Output
$15.00
GPT-5.1 Chat is cheaper on both: 2.4× input, 1.5× output.
Writing DNA
Style Comparison
Similarity
45%
Grok 4 uses 59.8x more emoji
GPT-5.1 Chat
Grok 4
73%Vocabulary56%
18wSentence Length18w
0.45Hedging0.65
1.1Bold2.4
2.4Lists2.4
0.00Emoji0.60
0.00Headings0.73
0.06Transitions0.06
Based on 15 + 26 text responses
Research
What we learned reading every model
FAQ
Common questions
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