LongCat-Flash-Thinking (Reasoning)

by Meituan

LongCat-Flash-Thinking (Reasoning) is a reasoning model from Meituan, released on September 22, 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 #87 of 220 models by Intelligence Score with a score of 28.7.

LongCat-Flash-Thinking is Meituan's reasoning model built on the LongCat-Flash foundation with 560B total parameters (MoE, ~27B activated). It introduces a training pipeline specifically tuned for advanced reasoning, featuring Re-thinking Mode that delivers parallel reasoning paths for sophisticated decision-making. Achieves strong performance on mathematical reasoning, agentic tool use, and formal theorem proving benchmarks.

Key specs

ProviderMeituan
Release date2025-09-22
Licenseopen source
Context window128K tokens
Max output128K tokens
Input price$0.3 / 1M tokens
Output price$1.2 / 1M tokens
Intelligence Score28.7
Coding index13.9

Quick answers

What is the context window of LongCat-Flash-Thinking (Reasoning)?

LongCat-Flash-Thinking (Reasoning) has a context window of 128K tokens, with a maximum output of 128K tokens per response.

How much does LongCat-Flash-Thinking (Reasoning) cost?

LongCat-Flash-Thinking (Reasoning) costs $0.3 per 1M input tokens and $1.2 per 1M output tokens through the API.

Is LongCat-Flash-Thinking (Reasoning) open source?

Yes. LongCat-Flash-Thinking (Reasoning) is an open model released under the open source license.

When was LongCat-Flash-Thinking (Reasoning) released?

Meituan released LongCat-Flash-Thinking (Reasoning) on September 22, 2025.

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

LongCat-Flash-Thinking (Reasoning) scores 28.7 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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