OPENAI VS XAI
GPT-5.5 Pro vs Grok Build 0.1
Grok Build 0.1 is about 54x cheaper than GPT-5.5 Pro on a blended 3:1 input:output rate — the same 10K-in/2K-out request costs $0.014 vs $0.66. GPT-5.5 Pro has the larger context window (1,047,576 vs 256,000 tokens).
Pricing verified
API pricing per 1M tokens
| Model | Input / 1M tokens | Output / 1M tokens | Blended (3:1 mix) |
|---|---|---|---|
| GPT-5.5 Pro | $30.00 | $180.00 | $67.50 |
| Grok Build 0.1 | $1.00 | $2.00 | $1.25 |
Rates from official OpenAI 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 |
|---|---|---|---|
| GPT-5.5 Pro | $0.66 | $66,000 | +$64,600 |
| 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 | GPT-5.5 Pro | Grok Build 0.1 |
|---|---|---|
| Provider | OpenAI | xAI |
| Context window | 1,047,576 tokens | 256,000 tokens |
| Model class | Reasoning | General text |
| Tokenizer | o200k_base (exact, public) | Proprietary (counts estimated) |
Count tokens for each model on its own page: GPT-5.5 Pro token counter and Grok Build 0.1 token counter. All OpenAI models are on the OpenAI Token Counter. All xAI models are on the Grok Token Counter.
FAQ
GPT-5.5 Pro vs Grok Build 0.1 FAQ
Which is cheaper, GPT-5.5 Pro or Grok Build 0.1?
Grok Build 0.1 is cheaper. At rates checked 2026-08-11, GPT-5.5 Pro costs $30.00 input / $180.00 output per 1M tokens, while Grok Build 0.1 costs $1.00 input / $2.00 output — about a 54x difference on a typical 3:1 input-heavy workload.
How much does a real request cost on GPT-5.5 Pro vs Grok Build 0.1?
A request with 10,000 input tokens and 2,000 output tokens costs about $0.66 on GPT-5.5 Pro and $0.014 on Grok Build 0.1. At 100,000 such requests per month that is $66,000 vs $1,400 — a difference of $64,600 per month.
Which has the bigger context window, GPT-5.5 Pro or Grok Build 0.1?
GPT-5.5 Pro. It supports 1,047,576 tokens of context versus 256,000 tokens — roughly 786,000 English words in one request.
Do GPT-5.5 Pro and Grok Build 0.1 count tokens the same way?
Not exactly. GPT-5.5 Pro uses the published o200k_base tokenizer and Grok Build 0.1 uses a proprietary tokenizer (counts are estimates). The same prompt will tokenize differently, which shifts effective cost per word.