Grok 3 Beta Mini overview
Grok 3 Beta Mini by xAI
Grok 3 Beta Mini is a lighter version of the Grok 3 Beta model, designed for quicker response times while maintaining robust reasoning capabilities.
Grok 3 Beta Mini specs
- Model ID
x-ai/grok-3-mini-beta- Developer
- xAI
- Context window
- 131,000 tokens
- Max output
- 130,000 tokens
- Input
- Text
- Output
- Text
- API
- OpenAI-compatible, base URL
https://api.aimlapi.com/v1
Overview
Grok 3 Beta Mini balances performance and efficiency, providing faster outputs suitable for real-time applications. It is a cost-efficient alternative to Grok 3 Beta, optimized for reasoning-heavy tasks that don’t require extensive domain knowledge. It offers transparent reasoning traces and excels in mathematical and quantitative problems.
Key Features
- Rapid Response: Optimized for speed, delivering quicker outputs for time-sensitive tasks.
- Cost-Effective: Lower operational costs due to reduced computational requirements.
- Efficient Reasoning: Maintains strong reasoning abilities with streamlined accuracy checks. Adjustable reasoning effort with parameters like
reasoning: { effort: "high" }
Intended Use
- Customer Support: Provides swift and relevant responses to user inquiries.
- Interactive Applications: Enhances user experience in chatbots and virtual assistants with prompt replies.
- Educational Platforms: Delivers quick explanations and answers for e-learning environments.
Architecture
Grok 3 Beta Mini utilizes Transformer-based architectures optimized for reasoning tasks. This model uses a lightweight framework prioritizing speed and cost efficiency.
Training Data
Trained on diverse datasets including legal filings, scientific papers, mathematical benchmarks like AIME2025, and synthetic reasoning corpora.
Data Source and Size
Grok 3 models leverage xAI’s Colossus supercluster with over 200,000 GPUs to process terabytes of data efficiently.
Use cases
- Real-time customer support and chatbot applications
- Rapid prototyping for coding and debugging
- Data extraction and analysis automation
- STEM education and logical problem solving
- Enterprise-scale applications requiring high throughput and low latency
Capabilities
- Function calling
- Streaming
- Structured outputs
- Reasoning
Grok 3 Beta Mini API pricing
| Usage | Price | Unit |
|---|---|---|
| Input | $1.25 | 1M tokens |
| Output | $2.5 | 1M tokens |
| Cached input | $0.2 | 1M tokens |
Prices from the AI/ML API price list, checked on Nov 4, 2026.
Grok 3 Beta Mini vs other models: token prices
AI/ML API input and output rates for 5 models, per million tokens.
| Model | Input | Output |
|---|---|---|
 Grok 3 Beta Mini | $1.25 | $2.5 |
| Grok Build 0.1 | $1 | $2 |
| Grok 4.7 | $2 | $6 |
| Grok 4.6 | $2 | $6 |
| Grok 4.5 | $2 | $6 |
How to use the Grok 3 Beta Mini API
View docs (opens in a new tab)
Build with your agent
Give your agent the model details, code and documentation.
1Get your API key
Create API key (opens in a new tab)export AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"2Make your first request
curl 'https://api.aimlapi.com/v1/chat/completions' \
-H "Authorization: Bearer $AIMLAPI_KEY" \
-H 'Content-Type: application/json' \
-d '{
"model": "x-ai/grok-3-mini-beta",
"messages": [
{
"role": "user",
"content": "Write a haiku about the ocean."
}
]
}'import os
import requests
headers = {
"Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
"Content-Type": "application/json",
}
payload = {
"model": "x-ai/grok-3-mini-beta",
"messages": [
{
"role": "user",
"content": "Write a haiku about the ocean."
}
]
}
response = requests.post("https://api.aimlapi.com/v1/chat/completions", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())const response = await fetch("https://api.aimlapi.com/v1/chat/completions", {
method: "POST",
headers: {
Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
"model": "x-ai/grok-3-mini-beta",
"messages": [
{
"role": "user",
"content": "Write a haiku about the ocean."
}
]
}),
});
if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());Models similar to Grok 3 Beta Mini
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Grok 3 Beta Mini FAQ
What is the context window of Grok 3 Beta Mini?
Grok 3 Beta Mini has a 131,000 tokens context window and can return up to 130,000 tokens.
What inputs and outputs does Grok 3 Beta Mini support?
Grok 3 Beta Mini takes text as input and returns text.
What is the model ID for Grok 3 Beta Mini?
Use x-ai/grok-3-mini-beta as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.
How much does Grok 3 Beta Mini cost?
Grok 3 Beta Mini costs $1.25 input and $2.5 output per 1M tokens on AI/ML API, billed as you go with no subscription.
Does Grok 3 Beta Mini support streaming?
Yes, Grok 3 Beta Mini can stream responses as they are generated.
Who created Grok 3 Beta Mini?
Grok 3 Beta Mini was built by xAI .
Does Grok 3 Beta Mini support function calling and tool use?
Yes, it supports function calling, parallel tool calls, and structured outputs.