Historical model (legacy). The rates below are the last recorded rates, not a recommendation for a new deployment.
Current price verification is unresolved or overdue. These are the last recorded rates; check the official source before budgeting. We do not relabel an old check with today's build date.
Grok 4.1 Fast Reasoning API Pricing
Grok 4.1 Fast Reasoning costs $0.20 per 1M input tokens and $0.50 per 1M output tokens. These rates were last verified on .
Published rates and billing units
| Billing dimension | USD list price |
|---|---|
| Input / 1M tokens | $0.20 |
| Output / 1M tokens | $0.50 |
Verified 2026-05-01 · Official source · Pricing methodology. Taxes, optional services and account-specific discounts are not included.
Cost examples
These examples use published list prices only. They exclude taxes, enterprise discounts, minimum charges, retries, batch discounts, and provider-specific billing rules.
1M input + 1M output
$0.70
A direct per-million comparison against every other text model.
100K input + 25K output
$0.0325
A compact chat, summarization, or analysis workload.
10M input + 2M output
$3.00
A monthly production estimate for heavier RAG or agent traffic.
75% cached input + 250K output
Not listed
xAI does not publish a cached-input rate for this model in our dataset.
Calculator for Grok 4.1 Fast Reasoning
Enter your own input, output, and cached-token assumptions. This calculator is preloaded with only Grok 4.1 Fast Reasoning, so the result stays focused on this model.
Input cost
$0.20
Output cost
$0.50
Total
$0.70
Price history
No list-price movement across 203 daily snapshots from 2026-04-22 to 2026-11-11.
When to use Grok 4.1 Fast Reasoning
Good fit
- reasoning-heavy prompts, planning, analysis, and multi-step tool use
- high-volume routing, classification, extraction, summaries, and fallback traffic
Be careful with
- decisions that depend on unpublished context-window limits without checking the provider docs first