Meituan: LongCat Flash Chat

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Model Card

LongCat Flash Chat is a 560-billion-parameter Mixture-of-Experts (MoE) language model developed by Meituan, dynamically activating roughly 27B parameters per token for an efficient balance of capability and cost.

As a non-thinking foundation model, it's optimized for conversational and agentic tasks, with particular strengths in tool use and multi-step interactions. It supports a 128K-token context window and delivers over 100 tokens per second at inference. On benchmarks, it scores 86.5 on ArenaHard-V2, 89.7 on MMLU, and 67.7 on τ²-Bench, performing competitively with models like DeepSeek-V3.1 and Kimi-K2 while activating fewer parameters.

A strong pick for developers building agentic workflows, coding assistants, or complex tool-calling pipelines where speed and efficiency matter.

Context Window 131K

tokens

Max Output 131K

tokens

Input Cost $0.2

per million tokens

Output Cost $0.8

per million tokens

Release Date Sep 1, 2025

 

Code Example

Add AI to your app with the Puter.js AI API — no API keys or setup required.

// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';

puter.ai.chat("Explain quantum computing in simple terms").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").then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

Frequently Asked Questions

How do I use LongCat Flash Chat?

You can access LongCat Flash Chat by Meituan 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.

Is LongCat Flash Chat free?

Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add LongCat Flash Chat to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.

What is the pricing for LongCat Flash Chat?
Pricing for LongCat Flash Chat is based on the number of input and output tokens used per request.
Price per 1M tokens
Input$0.2
Output$0.8
Who created LongCat Flash Chat?

LongCat Flash Chat was created by Meituan and released on Sep 1, 2025.

What is the context window of LongCat Flash Chat?

LongCat Flash Chat supports a context window of 131K tokens. For reference, that is roughly equivalent to 262 pages of text.

What is the max output length of LongCat Flash Chat?

LongCat Flash Chat can generate up to 131K tokens in a single response.

Does it work with React / Vue / Vanilla JS / Node / etc.?

Yes — the LongCat Flash Chat 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.

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