LongCat-Flash-Thinking
A 560B-parameter open-source MoE reasoning model with domain-parallel training, DORA asynchronous RL, and 64.5% token reduction on AIME-25.
Independent third-party resource. Not affiliated with or endorsed by LongCat or Meituan.
Overview
LongCat-Flash-Thinking is documented in the meituan-longcat GitHub repository and is listed in the publisher API documentation. The model is the same entity referenced in both sources.
Documented capabilities
The statements below are described in the cited primary documentation. They describe what the cited documentation says the model is, not an independent performance evaluation.
- 560B MoE reasoning model with long Chain-of-Thought.
- Domain-parallel training across STEM, Code, Agentic domains.
- DORA asynchronous RL: >3x speedup over synchronous methods.
- AIME-25 score 100.0 (Heavy Thinking mode); IMO-AnswerBench 86.8.
- 64.5% fewer tokens on AIME-25 without accuracy loss.
- Flash-Thinking-2601 upgrade adds Heavy Thinking and multi-environment robustness training.
Access and license
MIT License.
Documented context window: 128,000 tokens (per the cited publisher API documentation).
Independent-site notes
This profile is a source-based summary. It does not contain any benchmark, evaluation, or quality claim produced by this site.
No independent testing has been published by this site.
Any performance figures attributed to the model in third-party materials are vendor-reported and have not been independently verified on this site.
Sources
- LongCat-Flash-Thinking (arXiv:2509.18883)
Primary sourcePublished 2025-09-23Accessed 2026-07-27
Domain-parallel training, DORA RL (>3x speedup), 64.5% token reduction on AIME-25. Upgraded variant: Flash-Thinking-2601 (arXiv:2601.16725).
- LongCat-Flash-Thinking on HuggingFace
Primary sourceAccessed 2026-07-27
Model weights. MIT License.
- LongCat-Flash-Thinking GitHub Repository
Primary sourceAccessed 2026-07-27
MIT License. Model configuration and inference code.
FAQ
- Where can the primary source for LongCat-Flash-Thinking be found?
- The official GitHub repository (meituan-longcat) and HuggingFace page contain the primary documentation, model weights, and license for LongCat-Flash-Thinking.
- Is LongCat-Flash-Thinking available through the LongCat API?
- LongCat-Flash-Thinking is documented in the meituan-longcat GitHub organization. Refer to the publisher API documentation at longcat.chat for current API availability.
- Is this page an official LongCat or Meituan page?
- No. This page is published by an independent third-party site. It is not affiliated with, endorsed by, or sponsored by LongCat or Meituan.
- How often is this page updated?
- This page was last verified on 2026-07-27. Content is reviewed when new publisher documentation or model releases become available.
Independent third-party disclosure
This page is published by an independent third-party site. It is not affiliated with, endorsed by, sponsored by, or operated by Meituan, LongCat, or any of their affiliates. The content summarizes publicly-available primary documentation and does not represent the views of any referenced organization.
Last reviewed: 2026-07-27