Grok 4.1 Fast API Cost Calculator
Estimate your monthly API costs for Grok 4.1 Fast from X Ai.
Pricing per 1M tokens
Pricing last verified: Mar 21, 2026
30-Day Price History
Solid line: input price · Dashed line: output price
Estimate Your Costs
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Cost Breakdown
Compare with Similar Models
| Model | Input/1M | Output/1M |
|---|---|---|
| Grok 4 Fast X Ai | $0.2000 | $0.5000 |
| Grok 3 Mini X Ai | $0.3000 | $0.5000 |
| Grok 3 Mini Beta X Ai | $0.3000 | $0.5000 |
| Grok Code Fast 1 X Ai | $0.2000 | $1.50 |
| Grok 4.20 Beta X Ai | $2.00 | $6.00 |
Frequently Asked Questions
How much does Grok 4.1 Fast cost per token?
Grok 4.1 Fast is priced at $0.2000 per 1M input tokens and $0.5000 per 1M output tokens. Use the calculator above to estimate your monthly costs based on your usage volume.
What is the context window for Grok 4.1 Fast?
Grok 4.1 Fast has a context window of 2M tokens (2,000,000 tokens). The maximum output length is 30K tokens.
Does Grok 4.1 Fast support image inputs (vision)?
Yes, Grok 4.1 Fast supports vision/image inputs. You can send images as part of your prompts.
Does Grok 4.1 Fast support function calling (tool use)?
Yes, Grok 4.1 Fast supports function calling (also called tool use). You can define custom functions that the model can invoke as part of its responses.
How does Grok 4.1 Fast compare to similar models?
Grok 4.1 Fast costs $0.2000 input and $0.5000 output per 1M tokens. Grok 4.1 Fast is competitively priced compared to Grok 4 Fast ($0.2000 input / $0.5000 output per 1M tokens). See the "Compare with Similar Models" table above, or visit the Grok 4 Fast page at /tools/cost-calculator/x-ai/grok-4-fast.