# Grok 4.1 Fast (Reasoning) Usage, Cost & Rank | OpenCode Data

> Grok 4.1 Fast (Reasoning) costs $0.20 per 1M input tokens and $0.50 per 1M output tokens.

xAI's fast agentic tool-calling model with a 2M context window and built-in reasoning

- Page: https://opencode.ai/data/xai/grok-4-1-fast-reasoning
- JSON: https://opencode.ai/data/xai/grok-4-1-fast-reasoning.json
- Model ID: xai/grok-4.1-fast-reasoning
- Lab: xAI

## Model facts

| Fact | Value |
| --- | --- |
| Context window | 2M |
| Max output | 30K |
| Knowledge cutoff | - |
| Release date | 2025-11-19 |
| Input modalities | text, image |
| Output modalities | text |
| Reasoning | Yes |
| Tool calling | Yes |
| Open weights | No |

## Pricing: USD per 1M tokens

| Input | Output | Cached input | Cache write |
| --- | --- | --- | --- |
| $0.20 | $0.50 | $0.05 | - |

## Methodology

- Updates: Aggregated every hour. Days and weeks use UTC.
- Tokens: Input, output, reasoning, and cached tokens for each request.
- Users and sessions: Approximate counts of distinct users and OpenCode sessions.
- Cost: Session cost is the average cost per OpenCode session. Token prices are list prices from the OpenCode model catalog.
- Retention: The share of a model's users in one week who use it again the next week.
- Citation: Cite OpenCode Data (opencode.ai/data) with the update time shown at the top of the page.