Kimi K3.1 Pro Highspeed overview
Kimi K3.1 Pro Highspeed by Moonshot AI
Kimi K3.1 Pro Highspeed is the high-speed variant of Moonshot AI's Kimi K3.1 Pro: the same 3T-class open-weight model and 1,048,576-token context window, with output reported to be two to three times faster.
Kimi K3.1 Pro Highspeed specs
- Model ID
moonshot/kimi-k3-1-pro-highspeed- Developer
- Moonshot AI
- Context window
- 1,048,576 tokens
- Max output
- 1,048,576 tokens
- Input
- Text, Image
- Output
- Text
- API
- OpenAI-compatible, base URL
https://api.aimlapi.com/v1
What is Kimi K3.1 Pro Highspeed API?
Kimi K3.1 Pro Highspeed is the faster serving tier of Moonshot AI's Kimi K3.1 Pro. It runs the same post-trained 3T-class model with identical capabilities, and Moonshot AI reports two to three times faster output. It is built for latency-sensitive coding, agent and chat workloads. On AI/ML API it is available through the OpenAI-compatible chat completions endpoint.
Technical specifications
- Architecture: Mixture-of-Experts, 2.8T total / 104B active parameters
- Context window: 1,048,576 tokens
- Capabilities: reasoning, tool calling (parallel), vision, structured output, streaming
- Release date: October 23, 2026
Highspeed vs standard Kimi K3.1 Pro
Both variants share the same model and benchmarks. Highspeed trades a higher per-token price for faster generation; the standard Kimi K3.1 Pro costs half as much and suits batch or background work.
Where to use Kimi K3.1 Pro Highspeed
Interactive coding assistants
IDE and terminal agents where developers wait on every response.
Real-time agent loops
Multi-step tool use where each step's latency adds up across the run.
User-facing chat
Products where faster replies directly improve the experience.
Use cases
Kimi K3.1 Pro Highspeed fits interactive coding assistants and IDE agents, where each response is on the critical path for the developer.
It suits real-time agent loops with many tool calls, since faster generation shortens every step of a long run.
It works for user-facing chat and support products where response time affects the experience.
It keeps the full Kimi K3.1 Pro capability set, including reasoning, vision and a 1M-token context window.
Capabilities
- Reasoning
- Function calling
- Vision
- Structured outputs
- Streaming
Kimi K3.1 Pro Highspeed API pricing
| Usage | Price | Unit |
|---|---|---|
| Input | $4 | 1M tokens |
| Output | $20 | 1M tokens |
| Cached input | $0.2 | 1M tokens |
Prices from the AI/ML API price list, checked on Nov 4, 2026.
Kimi K3.1 Pro Highspeed vs other models: token prices
AI/ML API input and output rates for 5 models, per million tokens.
| Model | Input | Output |
|---|---|---|
 Kimi K3.1 Pro Highspeed | $4 | $20 |
| Kimi K2.7 Code | $0.95 | $4 |
| Kimi K2.7 Code HighSpeed | $1.9 | $8 |
| Kimi K3.1 Pro | $2 | $10 |
| Kimi K3 | $3 | $15 |
How to use the Kimi K3.1 Pro Highspeed API
View docs
Build with your agent
Give your agent the model details, code and documentation.
1Get your API key
Create API keyexport 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": "moonshot/kimi-k3-1-pro-highspeed",
"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": "moonshot/kimi-k3-1-pro-highspeed",
"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": "moonshot/kimi-k3-1-pro-highspeed",
"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 Kimi K3.1 Pro Highspeed
Related articles
Kimi K3.1 Pro Highspeed FAQ
What is Kimi K3.1 Pro Highspeed?
Kimi K3.1 Pro Highspeed is the high-speed variant of Moonshot AI's Kimi K3.1 Pro. It has the same model capabilities and 1M-token context window, and Moonshot AI reports it generates output two to three times faster.
What inputs and outputs does Kimi K3.1 Pro Highspeed support?
Kimi K3.1 Pro Highspeed takes text and image input and returns text. It supports reasoning, tool calling (including parallel tool calls), vision, structured output and streaming.
What is the context window of Kimi K3.1 Pro Highspeed?
Kimi K3.1 Pro Highspeed has a 1,048,576-token context window and can return up to 1,048,576 tokens.
How much does Kimi K3.1 Pro Highspeed cost on AI/ML API?
Kimi K3.1 Pro Highspeed costs $4 per 1M input tokens, $0.20 per 1M cached input tokens and $20 per 1M output tokens. Reasoning tokens are billed at the output rate.
When should I choose Highspeed over Kimi K3.1 Pro?
Choose Highspeed for interactive apps, coding assistants and agent loops where response time matters. Choose the standard Kimi K3.1 Pro for batch or background work where cost matters more than speed: it costs half as much per token.
How do I call Kimi K3.1 Pro Highspeed via API?
Send a request to the OpenAI-compatible chat completions endpoint https://api.aimlapi.com/v1/chat/completions with the model ID moonshot/kimi-k3-1-pro-highspeed and your AI/ML API key.
What is the Kimi K3.1 Pro Highspeed model ID?
Use moonshot/kimi-k3-1-pro-highspeed as the model parameter. Requests go to the OpenAI-compatible endpoint with your AI/ML API key.