Private Models
xAI: Grok 4.1 Fast
x-ai/grok-4.1-fastGrok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window.
- Modalities
- TextImagetoText
- In / out price
- $0.20 / $0.50per 1M
- Context
- 2M
- Released
- Dec 13, 2025
Providers
RedPill routes this model across providers with automatic fallbacks. Pricing is unified, so you pay the same price no matter which provider serves your request, while live metrics show first-token latency, speed, and uptime.
| x-ai | Checking | Checking | Checking |
Start building
Call this model from your application, or through your agents.
For applications
Point your OpenAI SDK at the Gateway. Chat, completions, and embeddings work unchanged.
1
Create a key
2
Set base URL
3
Verify receipt
For agents
Connect Claude Code, Codex, Pi, and more through Private AI Proxy. Traffic is protected while a verified session is active.
1
Install Proxy
2
Turn on Protected
3
Connect agents
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.redpill.ai/v1",
apiKey: process.env.REDPILL_API_KEY,
});
const response = await client.chat.completions.create({
model: "x-ai/grok-4.1-fast",
messages: [{ role: "user", content: "Say hello." }],
});