Kimi K2 API
The Dark Side of the Moon Frontier Reasoning Model
Integrate the full series of Kimi K2 models of the Dark Side of the Moon in OpenAI compatible format. Trillion-parameter MoE architecture—deep reasoning, ultra-long context, programming, and multilingual capabilities are outstanding. ```
Why Use Kimi Through Ace Data Cloud?
Kimi K2 is a trillion-parameter MoE (Mixture of Experts) model launched by the Dark Side of the Moon, competing with models like GPT-4o and Claude Sonnet in programming, mathematics, and reasoning benchmarks. The K2 series supports deep reasoning (Thinking) mode, excelling in complex logical analysis.
Ace Data Cloud offers complete Kimi K2 API proxy services, using OpenAI compatible format—no need to adapt to Moonshot's native API, just use the OpenAI SDK for direct calls. No regional restrictions, available globally.
Core Capabilities of Kimi K2 API
Unlock the full potential of Kimi K2 through OpenAI compatible interfaces
OpenAI Compatible Format
Call Kimi K2 via /v1/chat/completions, fully compatible with OpenAI SDK. Seamless switching, zero code changes.
Deep Reasoning (Thinking)
Kimi K2 Thinking series has built-in deep reasoning, structuring thoughts before answering, significantly improving performance on mathematical and logical tasks.
Bilingual Optimization in Chinese and English
Excellent native Chinese understanding, while also performing well in English. Suitable for Chinese scenarios, cross-language translation, and multilingual application development.
Top Programming Capabilities
K2 excels in coding benchmarks like SWE-bench and LiveCodeBench, skilled in code generation, debugging, and code review.
Streaming
Supports SSE streaming, real-time token-by-token output. Set stream: true for a streaming response experience.
Structured Output
Specify JSON output format via response_format, along with JSON Schema to obtain structured API response data.
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://api.acedata.cloud/v1"
)
response = client.chat.completions.create(
model="kimi-k2-turbo-preview",
messages=[
{"role": "user", "content": "Implement a quicksort algorithm in Python"}
],
stream=True
)
for chunk in response:
if chunk.choices[0].delta.content:
print(chunk.choices[0].delta.content, end="")
{
"id": "chatcmpl-kimi-20250701120000",
"object": "chat.completion",
"created": 1751356800,
"model": "kimi-k2-turbo-preview",
"choices": [{
```json
{
"role": "assistant",
"content": "def quicksort(arr):\n if len(arr) <= 1:\n return arr\n pivot = arr[len(arr) // 2]\n left = [x for x in arr if x < pivot]\n middle = [x for x in arr if x == pivot]\n right = [x for x in arr if x > pivot]\n return quicksort(left) + middle + quicksort(right)"
},
"finish_reason": "stop"
}],
"usage": {
"prompt_tokens": 12,
"completion_tokens": 85,
"total_tokens": 97
}
}
OpenAI SDK One-Line Code Switch
Just change base_url and model to use Kimi K2 in your existing OpenAI project—no code refactoring needed.
Get API Key
Register on Ace Data Cloud and obtain Bearer Token from the console
Modify base_url
Set base_url to https://api.acedata.cloud/v1
Select Kimi Model
Set model to Kimi K2 model name, such as kimi-k2-turbo-preview
What can be built using Kimi API?
From Chinese NLP to complex reasoning—developers are building these applications with Kimi K2
Chinese Dialogue Assistant
Build high-quality Chinese customer service, knowledge Q&A, and personal AI assistants, with native Chinese understanding far exceeding general models
Code Generation and Review
K2 performs excellently in programming benchmarks, supporting code generation, bug fixing, code review, and architectural suggestions
Cross-Language Translation
Native bilingual capabilities in Chinese and English, suitable for high-quality translation, localization, and multilingual content generation
Deep Reasoning and Analysis
Mathematical problem solving, logical reasoning, data analysis—Thinking mode provides a step-by-step reasoning process
3 Steps to Get Started Quickly
From registration to sending the first Kimi K2 message, it takes less than 3 minutes
Register and Get API Key
Create a free account on Ace Data Cloud and generate your Bearer Token from the console.
Call Using OpenAI SDK
Configure base_url for Ace Data Cloud, select any Kimi K2 model to get started.
Integration and Expansion
Embed Kimi K2 into your application. OpenAI compatible format makes switching between multiple models easy.
Why choose Ace Data Cloud instead of using Moonshot API directly?
Comprehensive advantages in format compatibility, global availability, and unified interface
| Comparison Dimension | Ace Data Cloud | Moonshot Direct Connection |
|---|---|---|
| OpenAI Compatible Format | ✓ | Partially compatible |
| Global Availability | ✓ Out of the box | ✗ Limited in some regions |
| Streaming | ✓ | ✓ |
| Unified Interface for Multiple Models | ✓ GPT / Claude / Gemini / Kimi | ✗ Only Kimi |
| Pay-as-you-go | ✓ Flexible top-up | ✓ |
| No Overseas Phone Number Required for Registration | ✓ | ✗ Requires Chinese phone number |
| Thinking Reasoning Model | ✓ | ✓ |
Select the Right Kimi K2 Model
From high-speed reasoning to deep thinking—Kimi K2 offers various model variants
K2 Turbo
High Speed Low CostThe fastest K2 variant, optimized for low latency and high throughput. Suitable for high concurrency scenarios.
- ✓ Ultimate response speed
- ✓ Optimal cost performance
- ✓ Suitable for classification, extraction, simple dialogue
- ✓ Large-scale concurrency support
K2 Thinking
Deep ReasoningK2 model with built-in Thinking reasoning mode. Engages in deep thinking before answering, enhancing performance on complex tasks.
- ✓ Visible deep reasoning process
- ✓ Excellent performance in mathematics and logic
- ✓ Top-level in programming benchmark tests
- ✓ Preferred for complex tasks
K2.5
LatestThe latest version of the K2 series, with comprehensive capability enhancements. Represents the latest model technology of Moonshot.
- ✓ Latest model architecture
- ✓ Comprehensive capability enhancement
- ✓ Enhanced instruction adherence
- ✓ More precise output control
Kimi K2 API Pricing
Charged based on Token usage. No subscription fees, no hidden costs.
Bulk packages offer more discounts
Charged based on actual Token usage, with separate pricing for input and output
- ✓ All K2 models at a unified low price
- ✓ Thinking models available at the same price
- ✓ K2.5 latest model ready to use
- ✓ Separate pricing for input and output
- ✓ Streaming—Free
Exclusive plans for high-usage teams
- ✓ Tiered discounts based on usage
- ✓ Priority support with account manager
- ✓ Custom rate limits
- ✓ SLA guarantees
- ✓ Private deployment options
Frequently Asked Questions
Everything you need to know about using Kimi K2 API
What is Kimi K2? How is it different from other models? ▾
Kimi K2 is a large MoE (Mixture of Experts) model launched by Moonshot AI, with over 1 trillion total parameters. In programming, mathematics, and reasoning benchmarks, K2 performs comparably or better than models like GPT-4o and Claude 3.5 Sonnet. K2's unique advantage lies in its native Chinese understanding capability and Thinking reasoning mode.
Does it support OpenAI SDK? ▾
Yes! Fully compatible with OpenAI SDK (Python, Node.js, Go, etc.). Just modify base_url to https://api.acedata.cloud/v1 and set the model to any Kimi K2 model name. Your existing OpenAI code can switch to Kimi with almost no modifications.
What is the difference between Kimi K2 Thinking and regular K2? ▾
K2 Thinking series engages in a deep reasoning process before answering, similar to OpenAI's o1 series. The model first thinks through the steps to solve the problem before providing the final answer. This significantly outperforms regular K2 in tasks like mathematical proofs, complex logical reasoning, and programming. K2 Thinking Turbo offers a faster reasoning version.
How does its Chinese capability compare to GPT/Claude? ▾
Kimi K2 has a native advantage in Chinese understanding and generation. Due to the large amount of high-quality Chinese data in its training set, K2 typically outperforms GPT and Claude in understanding Chinese context, idiomatic expressions, and cultural background recognition. If your application primarily targets Chinese users, Kimi K2 is an excellent choice.
What is the pricing model? ▾
Charged based on Token usage, with separate pricing for input Tokens and output Tokens. All K2 series models have a unified price, including Thinking reasoning models. No subscription fees, no monthly fees, pay for what you use. Available immediately after top-up, and the balance never expires.
Can I use GPT, Claude, Gemini, and Kimi simultaneously? ▾
Yes! Ace Data Cloud provides multiple LLMs including GPT, Claude, Gemini, and Kimi through a unified OpenAI compatible interface. Just change the model parameter to switch between different models, with the API format being completely consistent, requiring no maintenance of multiple codebases. The same API Key can access all models.
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Start Using Kimi K2 API Now
Use the strongest reasoning model of Moonshot through OpenAI compatible format. Pay-as-you-go—no subscription fees, no commitments.