GOOGLE VS XAI
Gemini 3.1 Pro Preview vs Grok Build 0.1
Grok Build 0.1 is about 3.6x cheaper than Gemini 3.1 Pro Preview on a blended 3:1 input:output rate — the same 10K-in/2K-out request costs $0.014 vs $0.044. Gemini 3.1 Pro Preview has the larger context window (1,048,576 vs 256,000 tokens).
Pricing verified
API pricing per 1M tokens
| Model | Input / 1M tokens | Output / 1M tokens | Blended (3:1 mix) |
|---|---|---|---|
| Gemini 3.1 Pro Preview | $2.00 | $12.00 | $4.50 |
| Grok Build 0.1 | $1.00 | $2.00 | $1.25 |
Rates from official Google pricing and official xAI pricing, checked 2026-08-11.
What a real workload costs
Example: one request with 10,000 input tokens and 2,000 output tokens, then that request at 100,000 runs per month.
| Model | Per request (10K in / 2K out) | Per month (100K requests) | Monthly delta |
|---|---|---|---|
| Gemini 3.1 Pro Preview | $0.044 | $4,400 | +$3,000 |
| Grok Build 0.1 | $0.014 | $1,400 | — |
Model your own prompt sizes and volumes in the token cost analyzer, or check caching savings with the prompt caching calculator.
Specs side by side
| Spec | Gemini 3.1 Pro Preview | Grok Build 0.1 |
|---|---|---|
| Provider | xAI | |
| Context window | 1,048,576 tokens | 256,000 tokens |
| Model class | Reasoning | General text |
| Tokenizer | Proprietary (counts estimated) | Proprietary (counts estimated) |
Count tokens for each model on its own page: Gemini 3.1 Pro Preview token counter and Grok Build 0.1 token counter. All Google models are on the Gemini Token Counter. All xAI models are on the Grok Token Counter.
FAQ
Gemini 3.1 Pro Preview vs Grok Build 0.1 FAQ
Which is cheaper, Gemini 3.1 Pro Preview or Grok Build 0.1?
Grok Build 0.1 is cheaper. At rates checked 2026-08-11, Gemini 3.1 Pro Preview costs $2.00 input / $12.00 output per 1M tokens, while Grok Build 0.1 costs $1.00 input / $2.00 output — about a 3.6x difference on a typical 3:1 input-heavy workload.
How much does a real request cost on Gemini 3.1 Pro Preview vs Grok Build 0.1?
A request with 10,000 input tokens and 2,000 output tokens costs about $0.044 on Gemini 3.1 Pro Preview and $0.014 on Grok Build 0.1. At 100,000 such requests per month that is $4,400 vs $1,400 — a difference of $3,000 per month.
Which has the bigger context window, Gemini 3.1 Pro Preview or Grok Build 0.1?
Gemini 3.1 Pro Preview. It supports 1,048,576 tokens of context versus 256,000 tokens — roughly 786,000 English words in one request.
Do Gemini 3.1 Pro Preview and Grok Build 0.1 count tokens the same way?
Not exactly. Gemini 3.1 Pro Preview uses a proprietary tokenizer (counts are estimates) and Grok Build 0.1 uses a proprietary tokenizer (counts are estimates). The same prompt will tokenize differently, which shifts effective cost per word.