xAI: Grok 4 Fast API Pricing
Live token cost for xAI: Grok 4 Fast from xAI. Use the figures below for budgeting, then tune your exact request mix in the interactive calculator. Prices refresh every 24 hours from OpenRouter.
Capabilities
xAI: Grok 4 Fast cost at scale
Estimated monthly cost across common production volumes. Assumes 30-day months and the request shapes shown.
| Tier | Requests / day | In / out tokens | $ / month |
|---|---|---|---|
| Hobby | 1,000 | 500 / 200 | $6.00 |
| Startup | 10,000 | 1,500 / 500 | $165.00 |
| Growth | 100,000 | 3,000 / 800 | $3,000.00 |
| Enterprise | 1,000,000 | 8,000 / 2,000 | $78,000.00 |
Compare xAI: Grok 4 Fast vs.
Frequently asked questions
How much does xAI: Grok 4 Fast cost?
xAI: Grok 4 Fast costs $0.20 per 1M input tokens and $0.50 per 1M output tokens, with cached input at $0.05 per 1M tokens. A typical 1,500-token in / 500-token out request costs $0.00055.
Does xAI: Grok 4 Fast support cached input?
Yes. xAI: Grok 4 Fast supports prompt caching at $0.05 per 1M cached input tokens. Reuse the same system prompt or context across requests to cut input cost dramatically.
What is the xAI: Grok 4 Fast context window?
xAI: Grok 4 Fast supports a context window of 2,000,000 tokens (2000K). Max output per response is 30,000 tokens.
What is xAI: Grok 4 Fast good for?
xAI: Grok 4 Fast is a good fit for real-time information, X integration, uncensored exploratory queries. For other use cases, run your specific input/output mix through the interactive calculator to compare against alternative models.