x-ai/grok-4-fast
2,000,000 context · $0.20/M input tokens · $0.50/M output tokens
Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...
Pricing
Pay-per-use
No upfront costs, pay only for what you use
Try the model
API Usage
Use the following code examples to integrate with our API:
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://llm.wavespeed.ai/v1"
)
response = client.chat.completions.create(
model="x-ai/grok-4-fast",
messages=[
{"role": "user", "content": "Hello!"}
]
)
print(response.choices[0].message.content)Model Introduction
X-Ai grok-4-fast
x-ai grok-4-fast
Why It Looks Great
- Large Language Model architecture for efficient processing
- 2000000 context window for long document handling
- Competitive pricing at $0.2/$0.5 per million tokens
Key Features
- Context Window: 2000000 tokens
- Max Output: 30000 tokens
- Vision: Supported
- Function Calling: Supported
Specifications
| Specification | Value |
|---|---|
| Provider | X-Ai |
| Model Type | Large Language Model (LLM) |
| Architecture | N/A |
| Context Window | 2000000 tokens |
| Max Output | 30000 tokens |
| Input | Text |
| Output | Text |
| Vision | Supported |
| Function Calling | Supported |
Pricing
| Token Type | Cost per Million Tokens |
|---|---|
| Input | $0.2 |
| Output | $0.5 |
How to Use
- Write your prompt — describe the task, provide context, and specify desired output format.
- Submit — the model processes your request and returns the response.
API Integration
Base URL: https://llm.wavespeed.ai/v1 API Endpoint: chat/completions Model ID: x-ai/grok-4-fast
API Usage
Python SDK
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://llm.wavespeed.ai/v1"
)
response = client.chat.completions.create(
model="x-ai/grok-4-fast",
messages=[
{"role": "user", "content": "Hello!"}
]
)
print(response.choices[0].message.content)cURL
curl https://llm.wavespeed.ai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "x-ai/grok-4-fast",
"messages": [{"role": "user", "content": "Hello!"}]
}'Notes
- Model: x-ai/grok-4-fast
- Provider: X-Ai
Info
Supported Functionality
API Access Guide
Grok 4 Fast API
x-ai/grok-4-fast
Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...
Input
$0.2 /M
Output
$0.5 /M
Context
2000K
Max Output
30K
Vision
Supported
Tool Use
Supported
Try Grok 4 Fast on WaveSpeedAI
Access Grok 4 Fast through our unified API — OpenAI-compatible, no cold starts, transparent pricing.
Frequently Asked Questions about Grok 4 Fast
How much does Grok 4 Fast cost via the API?+
Pricing on WaveSpeedAI: $0.20 per million input tokens and $0.50 per million output tokens. Prompt caching and batch processing are billed separately and reduce effective cost on long, repetitive workloads.
What is the context window of Grok 4 Fast?+
Grok 4 Fast supports up to 2000K tokens of context with up to 30K tokens of output per request.
Is Grok 4 Fast OpenAI-compatible?+
Yes. WaveSpeedAI exposes Grok 4 Fast through an OpenAI-compatible endpoint at https://llm.wavespeed.ai/v1. Point the official OpenAI SDK at this base URL with your WaveSpeedAI API key — no other code changes required.
How do I get started with Grok 4 Fast?+
Sign in to WaveSpeedAI, create an API key in Access Keys, then send a request to https://llm.wavespeed.ai/v1/chat/completions with model id set to the value shown above. New accounts receive free credits to evaluate Grok 4 Fast before paying per token.