LongCat-Flash-Chat

by Meituan

LongCat-Flash-Chat is a model from Meituan, released on August 29, 2025. It has a 128K-token context window and can generate up to 128K output tokens. API pricing is $0.3 per 1M input tokens and $1.2 per 1M output tokens. It ranks #121 of 220 models by Intelligence Score with a score of 19.8.

LongCat-Flash-Chat is Meituan's first open-source foundation model, a 560B parameter Mixture-of-Experts (MoE) model that dynamically activates 18.6B-31.3B parameters (~27B average) based on contextual demands. It features Zero-Computation Experts for efficient routing and supports 128K context. Optimized for conversational and agentic tasks, it shows competitive performance across reasoning, coding, instruction following, and domain benchmarks with particular strengths in tool use and complex multi-step interactions. Achieves over 100 tokens per second on H800 GPUs.

Key specs

ProviderMeituan
Release date2025-08-29
Licenseopen source
Context window128K tokens
Max output128K tokens
Input price$0.3 / 1M tokens
Output price$1.2 / 1M tokens
Intelligence Score19.8
Coding index12.3

Quick answers

What is the context window of LongCat-Flash-Chat?

LongCat-Flash-Chat has a context window of 128K tokens, with a maximum output of 128K tokens per response.

How much does LongCat-Flash-Chat cost?

LongCat-Flash-Chat costs $0.3 per 1M input tokens and $1.2 per 1M output tokens through the API.

Is LongCat-Flash-Chat open source?

Yes. LongCat-Flash-Chat is an open model released under the open source license.

When was LongCat-Flash-Chat released?

Meituan released LongCat-Flash-Chat on August 29, 2025.

How does LongCat-Flash-Chat compare to Claude Opus 5.5 (Reasoning)?

LongCat-Flash-Chat scores 19.8 on the Intelligence Score versus 60.5 for Claude Opus 5.5 (Reasoning), the current #1. Input pricing is $0.3 vs $4 per 1M tokens.

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