Moonshot AI: Kimi V1 128K
moonshotai/kimi-v1-128k
Try Kimi V1 128K for free in your browser, and add it to your app for free with Puter.js AI API.
Try it free Add to your app// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain quantum computing in simple terms", {
model: "moonshotai/kimi-v1-128k"
}).then(response => {
document.body.innerHTML = response.message.content;
});
<html>
<body>
<script src="https://js.puter.com/v2/"></script>
<script>
puter.ai.chat("Explain quantum computing in simple terms", {
model: "moonshotai/kimi-v1-128k"
}).then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
Model Card
Kimi V1 128K is the 128,000-token context tier of Moonshot AI's original v1 chat model line, the same route previously listed as moonshot-v1-128k before Moonshot rebranded its developer platform around the Kimi name.
The 8K, 32K, and 128K tiers share the same underlying model, and context length is the only difference between them. Moonshot's docs describe the 128K tier as suited to generating very long texts, which makes it a fit for long documents, large transcripts, and extended conversation histories.
The API is OpenAI-compatible and supports tool calling. This is a legacy line. Moonshot's newer K-series models (Kimi K2 and K3) now cover agentic and reasoning workloads, and the v1 series is no longer offered to newly registered platform accounts, so this route mainly serves existing integrations.
Context Window 131K
tokens
Max Output 131K
tokens
Input Cost $2
per million tokens
Output Cost $5
per million tokens
Input text
modalities
Tool Use Yes
Release Date Jan 31, 2024
Try Kimi V1 128K for free
Try Kimi V1 128K instantly in your browser.
This playground uses the Puter.js AI API — no API keys or setup required.
More AI Models From Moonshot AI
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Kimi K3.1 Pro
Kimi K3.1 Pro is a multimodal language model from Moonshot AI, announced October 23, 2026 as a post-trained upgrade of Kimi K3. It accepts text, image, and video input, has a 1-million-token context window, and Moonshot plans to release the weights by November 4. Moonshot reports 65.7% on Terminal-Bench 4.0, ahead of GPT-6 Astra and slightly behind Claude Opus 5.5, and 92.7% on BenchCAD, a 3D model coding benchmark. It also reports higher scores than both models on OfficeQA Pro v2, a financial analysis benchmark. Cybersecurity benchmark scores trail both, since Moonshot removed cybersecurity content from post-training data. It suits developers building coding agents, tool-calling pipelines, and financial or document analysis workflows that need long context and multimodal input.
ChatKimi K3.1 Pro HighSpeed
Kimi K3.1 Pro HighSpeed is the faster-serving variant of Kimi K3.1 Pro, the multimodal language model from Moonshot AI announced in October 2026. It accepts text, image, and video input and has a 1-million-token context window. Moonshot says it delivers the same model capabilities as Kimi K3.1 Pro at 2 to 3 times the output speed, for more responsive interactions. It is priced at twice the standard model's rate. Choose it when latency matters more than cost, such as interactive coding agents, tool-calling loops with many sequential steps, and chat or document analysis features where users wait on the response. For batch or background jobs, the standard Kimi K3.1 Pro costs less.
ChatKimi K3
Kimi K3 is Moonshot AI's flagship open-weight model, released July 16, 2026, with full weights following on July 27. At roughly 2.8 trillion parameters in a Mixture-of-Experts architecture, Moonshot positions it as the largest open-source model released to date, built on two new components: Kimi Delta Attention, a hybrid linear attention mechanism, and Attention Residuals, a replacement for standard residual connections. It runs in an always-on thinking mode with a 1-million-token context window and accepts text, image, and video input. Reported results include 93.5% on GPQA Diamond, 91.2% on BrowseComp, 88.3% on Terminal-Bench 2.1, and a first-place finish on Arena.ai's Frontend Code Arena, putting it close to Claude Opus 4.8 and GPT-5.5 on several agentic and coding tasks. These figures come from Moonshot and early testers, not independently confirmed leaderboards. It suits developers building long-horizon coding agents and tool-calling pipelines who want frontier-level performance at open-weight pricing.
Frequently Asked Questions
You can access Kimi V1 128K by Moonshot AI through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.
Kimi V1 128K is free to try with a Puter account. Every account includes a free AI allowance, and you can chat with it in the playground on this page. You can upgrade your account anytime for a larger allowance.
Kimi V1 128K is free to integrate using the Puter.js AI API. With the User-Pays Model, you can add AI to your app for $0, since users cover their own AI usage through their Puter account.
| Price per 1M tokens | |
|---|---|
| Input | $2 |
| Output | $5 |
Kimi V1 128K was created by Moonshot AI and released on Jan 31, 2024.
Kimi V1 128K supports a context window of 131K tokens. For reference, that is roughly equivalent to 262 pages of text.
Kimi V1 128K can generate up to 131K tokens in a single response.
Kimi V1 128K accepts the following input types: text. It produces: text.
Yes, Kimi V1 128K supports tool use (function calling), allowing it to interact with external tools, APIs, and data sources as part of its response flow.
Yes — the Kimi V1 128K API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.
Add Kimi V1 128K to your app for free
Developers can integrate Kimi V1 128K for free using the Puter.js AI API.
With the User-Pays Model, each user covers their own AI usage instead of the developer.