GOOGLE VS XAI
Gemini 3.1 Pro Preview vs Grok Code Fast 1
Grok Code Fast 1 is about 8.6x cheaper than Gemini 3.1 Pro Preview on a blended 3:1 input:output rate — the same 10K-in/2K-out request costs $0.005 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 Code Fast 1 | $0.20 | $1.50 | $0.525 |
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 | +$3,900 |
| Grok Code Fast 1 | $0.005 | $500 | — |
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 Code Fast 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 Code Fast 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 Code Fast 1 FAQ
Which is cheaper, Gemini 3.1 Pro Preview or Grok Code Fast 1?
Grok Code Fast 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 Code Fast 1 costs $0.20 input / $1.50 output — about a 8.6x difference on a typical 3:1 input-heavy workload.
How much does a real request cost on Gemini 3.1 Pro Preview vs Grok Code Fast 1?
A request with 10,000 input tokens and 2,000 output tokens costs about $0.044 on Gemini 3.1 Pro Preview and $0.005 on Grok Code Fast 1. At 100,000 such requests per month that is $4,400 vs $500 — a difference of $3,900 per month.
Which has the bigger context window, Gemini 3.1 Pro Preview or Grok Code Fast 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 Code Fast 1 count tokens the same way?
Not exactly. Gemini 3.1 Pro Preview uses a proprietary tokenizer (counts are estimates) and Grok Code Fast 1 uses a proprietary tokenizer (counts are estimates). The same prompt will tokenize differently, which shifts effective cost per word.