Meituan releases open weights for LongCat-2.5, a 1.6 trillion parameter model

Meituan's LongCat team released the full open weights of LongCat-2.5 on Hugging Face under a permissive MIT license on November 9, 2026, one week after the model's hosted API debut, giving developers a self-hostable, frontier-scale multimodal model aimed at agentic coding. The weights are published at meituan-longcat/LongCat-2.5.

What changed with the LongCat-2.5 release

• LongCat-2.5 has 1.6 trillion total parameters, with about 48 billion active per token, using a mixture-of-experts architecture.
• The model is natively multimodal, supporting image-text-to-text input.
• Weights are released under the MIT license, permitting commercial use and redistribution.
• Weights are hosted on Hugging Face under the meituan-longcat organization in BF16 format, totaling about 3.56 TB.
• The model offers both a 'thinking' (reasoning) mode and a token-efficient 'non-thinking' mode.
• Reported benchmark scores include Terminal-Bench v2.1: 88.4, DeepSWE v1.1: 64.6, BrowseComp: 91.9 and MCP Atlas: 83.1.

What it means for people who build with AI

A frontier-scale, 1.6 trillion parameter open-weight model released under a fully permissive license gives developers and vibe coders a self-hostable alternative to closed coding agents, intensifying competition in the open-weight agentic-coding space. LongCat-2.5 is explicitly positioned for long-horizon agentic coding tasks, including screenshot analysis, repository navigation, patch generation and browser-based verification of changes.

Availability and next steps

The weights release follows Meituan's November 2, 2026 launch of LongCat-2.5 as a hosted chat and API model. For a limited time, the hosted API is priced at $0.30 per million input tokens and $1.20 per million output tokens, with cached input priced at $0.006 per million tokens. Meituan also lists its projects through the meituan-longcat GitHub organization.

Sources

• meituan-longcat/LongCat-2.5 (Meituan / Hugging Face, November 9, 2026, official)
• meituan-longcat GitHub organization (Meituan (LongCat GitHub org), November 9, 2026, official)

Written with AI assistance, strictly from the sources listed above. Before it went live, automated checks verified its dates, sources and every language edition.