Grok 4.1 Fast vs Grok Build 0.1
Side-by-side API pricing comparison · xAI vs xAI
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Grok 4.1 Fast is 328.6% cheaper on blended cost ($0.350 vs $1.50/Mtok)
Grok 4.1 Fast
by xAI
Current budgetInput
$0.200/Mtok
Output
$0.500/Mtok
✓ Cheaper
| Blended avg | $0.350/Mtok |
|---|---|
| Context | 2M tokens |
| Modality | text, image |
| Parameters | Proprietary |
| Released | Sep 22, 2025 |
Grok Build 0.1
by xAI
Current codingInput
$1.00/Mtok
Output
$2.00/Mtok
| Blended avg | $1.50/Mtok |
|---|---|
| Context | 256K tokens |
| Modality | text |
| Parameters | Proprietary |
| Released | Feb 1, 2026 |
Cost at scale — 1M tokens (50/50 input/output)
| Volume | Grok 4.1 Fast | Grok Build 0.1 | Savings |
|---|---|---|---|
| 1M tokens | $0.35 | $1.5 | $1.15 (76.7%) |
| 10M tokens | $3.5 | $15 | $11.5 (76.7%) |
| 100M tokens | $35 | $150 | $115 (76.7%) |
| 1000M tokens | $350 | $1500 | $1150 (76.7%) |
Summary
Grok 4.1 Fast by xAI costs $0.200/Mtok input and $0.500/Mtok output, with a 2M-token context window. It supports text, image input.
Grok Build 0.1 by xAI costs $1.00/Mtok input and $2.00/Mtok output, with a 256K-token context window. It supports text input.
On a blended cost basis, Grok 4.1 Fast is 328.6% cheaper than Grok Build 0.1. It also has a larger context window.
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.