Kimi K3 Fast API
Moonshot AI
Kimi K3 Fast is Venice’s low-latency serving profile for Moonshot AI’s 1M-context multimodal Kimi K3 model, with reasoning, tools, and structured outputs.
About Kimi K3 Fast
Kimi K3 Fast is a large language model developed by Moonshot AI. It's particularly well-suited for analyzing images, screenshots, and visual content, tackling complex, multi-step reasoning problems, orchestrating tool-using agents that call APIs and external services, grounding responses in real-time web search results, producing structured outputs for reliable data extraction, and handling large contexts of up to 1M tokens. Its 1M-token context window means you can pass in entire documents, codebases, or conversation histories without losing context. Developers choose Kimi K3 Fast when they need reliable, production-quality AI inference through a simple API — and on Qubax, it's available at a fraction of the cost of traditional providers.
In the broader AI landscape, Kimi K3 Fast sits among the frontier-tier offerings from Moonshot AI With advanced reasoning and multimodal vision and agentic tool use, it competes with the most frontier-tier models on the market. What sets it apart on Qubax isn't just the model itself — it's the accessibility. Rather than dealing with enterprise contracts or traditional payment rails, you get instant access via an OpenAI-compatible endpoint. That means you can drop Kimi K3 Fast into Cursor, Cline, LangChain, or any framework that speaks the OpenAI protocol and start building immediately.
Qubax offers Kimi K3 Fast at 63% below OpenRouter's price — just $1.69 per million input tokens and $8.44 per million output tokens. That pricing advantage compounds quickly at scale: a high-volume application sending millions of tokens per day can save significantly compared to using OpenRouter or the provider directly. And because Qubax runs on crypto-native infrastructure, you can pay with USDC, USDT, ETH, BTC, or 200+ other cryptocurrencies — no credit card or bank account required.
Pricing
| Token Type | Qubax | OpenRouter | You Save |
|---|---|---|---|
| Input (per 1M tokens) | $1.69 | $4.50 | 63% |
| Output (per 1M tokens) | $8.44 | $22.50 | 63% |
Prices per 1 million tokens. Pay with 200+ cryptocurrencies.
Price History (60 Days)
This model's price over the last 60 days. Compare against all top AI models →
Estimated Monthly Cost
Specifications
Use Cases
Capabilities
Quick Start
from openai import OpenAI
client = OpenAI(
base_url="https://api.qubax.ai/v1",
api_key="qbx_live_YOUR_API_KEY",
)
response = client.chat.completions.create(
model="kimi-k3-fast-api",
messages=[
{"role": "user", "content": "Hello!"}
],
)
print(response.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.qubax.ai/v1",
apiKey: "qbx_live_YOUR_API_KEY",
});
const response = await client.chat.completions.create({
model: "kimi-k3-fast-api",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);curl https://api.qubax.ai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer qbx_live_YOUR_API_KEY" \
-d '{
"model": "kimi-k3-fast-api",
"messages": [{"role": "user", "content": "Hello!"}]
}'Get your API key from the dashboard.
Why use Kimi K3 Fast on Qubax?
63% Cheaper
Up to 63% off OpenRouter prices
Pay with Crypto
200+ coins (BTC, ETH, SOL, USDT, USDC & more). No credit card needed.
OpenAI Compatible
Drop-in replacement. Works with Cline, Cursor, any tool.
More from Moonshot AI
Compare Kimi K3 Fast with alternatives
| Model | Provider | Input / 1M | Output / 1M | vs Kimi K3 Fast |
|---|---|---|---|---|
| Kimi K3 Fast | Moonshot AI | $1.69 | $8.44 | — |
| Claude Opus 5 | Anthropic | $1.01 | $4.05 | Cheaper |
| Hermes 3 Llama 3.1 405b (Morpheus Web) | Meta | $1.11 | $3.02 | Cheaper |
| GLM 5.1 Non-thinking (Morpheus Web) | Zhipu AI | $1.51 | $5.03 | Cheaper |
| Qwen 3.8 Max | Alibaba | $0.938 | $2.81 | Cheaper |
Frequently Asked Questions
How much does the Kimi K3 Fast API cost?
On Qubax, Kimi K3 Fast costs $1.69 per 1M input tokens and $8.44 per 1M output tokens. This is 63% cheaper than OpenRouter's price of $4.50 per 1M input tokens.
Is the Kimi K3 Fast API compatible with OpenAI?
Yes. Qubax provides an OpenAI-compatible API. You can use Kimi K3 Fast as a drop-in replacement by changing your base URL to https://api.qubax.ai/v1 and using your Qubax API key. It works with Cline, Cursor, OpenCode, Hermes Agent, and any tool that supports OpenAI APIs.
Why is Kimi K3 Fast cheaper on Qubax than OpenRouter?
Qubax sources AI inference from an open compute marketplace on the Base blockchain where GPU providers compete on price. We pass the savings to you — 63% cheaper than OpenRouter's price for Kimi K3 Fast.
How do I pay for Kimi K3 Fast API usage?
Qubax uses prepaid crypto credits. Deposit USDC on the Base chain and your balance is automatically deducted as you use the API. No credit card required. Top up from $3.
What is the context window of Kimi K3 Fast?
Kimi K3 Fast supports a context window of 1M tokens, allowing you to process large documents, codebases, or long conversations in a single request.
What can I build with Kimi K3 Fast?
Kimi K3 Fast is versatile enough for a wide range of applications. You can use it to analyze images and visual content, tackle complex multi-step reasoning tasks, build autonomous agents that call external tools and APIs, answer questions with real-time web search, generate structured JSON output for data pipelines, process long documents and entire codebases, and more. Because it's served through Qubax's OpenAI-compatible API, integration into existing apps, agents, or workflows takes just a few lines of code.
How fast is Kimi K3 Fast on Qubax?
Kimi K3 Fast on Qubax supports streaming responses, so tokens begin arriving in real time as they're generated. Latency depends on the provider and prompt complexity, but most requests start streaming within 200–800 milliseconds. Qubax routes requests through an intelligent routing layer, which selects the fastest available compute provider for each request — so you get competitive latency at a lower price.
Kimi K3 Fast vs Claude Opus 5: which should I choose?
Kimi K3 Fast by Moonshot AI and Claude Opus 5 by Anthropic are both strong models in a similar price tier. Kimi K3 Fast excels at complex reasoning and supports vision/image inputs. Claude Opus 5 comes from a different lab and may have different strengths depending on your workload. On Qubax, Kimi K3 Fast starts at $1.69/1M input tokens while Claude Opus 5 comes in at $1.01/1M, so Claude Opus 5 may be worth considering if you need to minimize per-token cost. Both are available on Qubax with crypto payments and OpenAI-compatible APIs, so you can try each and switch freely.
Can I use Kimi K3 Fast for commercial projects?
Yes. Kimi K3 Fast on Qubax can be used for commercial purposes. You own the outputs you generate. Qubax provides the API infrastructure — you bring your use case.
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