Introduction

Kimi-Linear-48B-A3B-Instruct is a high-efficiency large language model developed by MoonshotAI. Built with an innovative hybrid linear attention architecture and equipped with 48B total parameters, it is specially optimized for long-context comprehension, multi-turn dialogue and complex reasoning scenarios, supporting an ultra-long context window up to 1 million tokens.

Adopting a 3:1 structural ratio of Kimi Delta Attention and global MLA, this model greatly cuts down KV cache occupancy and improves inference throughput while maintaining strong comprehensive capability. It achieves outstanding results on multiple authoritative benchmarks, natively compatible with Transformers and vLLM frameworks, and can be quickly deployed for long document parsing, knowledge question answering and industrial intelligent conversation services.

Integrated Deployment

• Out-of-the-box inference scripts with pre-configured hardware and software parameters
• Released FlagOS-Metax container image supporting deployment within minutes

Consistency Validation

• Rigorously evaluated through benchmark testing: Performance and results from the FlagOS software stack are compared against native stacks on multiple public.

Evaluation Results

Benchmark Result

User Guide

Environment Setup

Operation Steps

Download FlagOS Image

docker pull harbor.baai.ac.cn/external-cooperation/kimi-linear-48b-a3b-instruct-metax-tree_0.5.1_metax3.0-gems_5.0.2-vllm_0.13.0-plugin_0.1.1-cx_none-python_3.12.11-torch_2.8.0_metax3.3.0.2_cu128-pcp_cuda12.8-gpu_metax_c550-arc_amd64-driver_3.3.12:2608200835

Download Open-source Model Weights

pip install modelscope
modelscope download --model FlagRelease/Kimi-Linear-48B-A3B-Instruct-metax-FlagOS --local_dir /data/Kimi-Linear-48B-A3B-Instruct-metax-FlagOS

Start the Container

docker run -itd \
  --name=flagos \
  --privileged \
  --network=host \
  -v /data:/data \
  harbor.baai.ac.cn/external-cooperation/kimi-linear-48b-a3b-instruct-metax-tree_0.5.1_metax3.0-gems_5.0.2-vllm_0.13.0-plugin_0.1.1-cx_none-python_3.12.11-torch_2.8.0_metax3.3.0.2_cu128-pcp_cuda12.8-gpu_metax_c550-arc_amd64-driver_3.3.12:2608200835
  sleep infinity
docker exec -it flagos  bash

Start the Server

export VLLM_PLUGINS=fl
export TRITON_ALL_BLOCKS_PARALLEL=1
export USE_FLAGGEMS=1
export CUDA_VISIBLE_DEVICES=0,1

export VLLM_FL_FLAGOS_BLACKLIST="sort,mm,mul,masked_fill_"

ulimit -n 2048 && nohup vllm serve \
--model /data/Kimi-Linear-48B-A3B-Instruct-metax-FlagOS \
--served-model-name kimi-linear-48b-a3b-instruct \
--host 0.0.0.0 \
--port 8000 \
--trust-remote-code \
--tensor-parallel-size 2 \
--enforce-eager \
> kimi_flagos.log 2>&1 &

Service Invocation

Invocation Script

curl http://localhost:8000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kimi-linear-48b-a3b-instruct",
    "messages": [{"role": "user", "content": "你好"}]
  }'

AnythingLLM Integration Guide

1. Download & Install

• Visit the official site: https://anythingllm.com/
• Choose the appropriate version for your OS (Windows/macOS/Linux)
• Follow the installation wizard to complete the setup

2. Configuration

• Launch AnythingLLM
• Open settings (bottom left, fourth tab)
• Configure core LLM parameters
• Click "Save Settings" to apply changes

3. Model Interaction

• After model loading is complete:
• Click "New Conversation"
• Enter your question (e.g., “Explain the basics of quantum computing”)
• Click the send button to get a response

Technical Overview

FlagOS is a fully open-source system software stack designed to unify the "model–system–chip" layers and foster an open, collaborative ecosystem. It enables a “develop once, run anywhere” workflow across diverse AI accelerators, unlocking hardware performance, eliminating fragmentation among vendor-specific software stacks, and substantially lowering the cost of porting and maintaining AI workloads. With core technologies such as the FlagScale, together with vllm-plugin-fl, distributed training/inference framework, FlagGems universal operator library, FlagCX communication library, and FlagTree unified compiler, the FlagRelease platform leverages the FlagOS stack to automatically produce and release various combinations of <chip + open-source model>. This enables efficient and automated model migration across diverse chips, opening a new chapter for large model deployment and application.

FlagGems

FlagGems is a high-performance, generic operator libraryimplemented in Triton language. It is built on a collection of backend-neutralkernels that aims to accelerate LLM (Large-Language Models) training and inference across diverse hardware platforms.

FlagTree

FlagTree is an open source, unified compiler for multipleAI chips project dedicated to developing a diverse ecosystem of AI chip compilers and related tooling platforms, thereby fostering and strengthening the upstream and downstream Triton ecosystem. Currently in its initial phase, the project aims to maintain compatibility with existing adaptation solutions while unifying the codebase to rapidly implement single-repository multi-backend support. Forupstream model users, it provides unified compilation capabilities across multiple backends; for downstream chip manufacturers, it offers examples of Triton ecosystem integration.

FlagScale and vllm-plugin-fl

Flagscale is a comprehensive toolkit designed to supportthe entire lifecycle of large models. It builds on the strengths of several prominent open-source projects, including Megatron-LM and vLLM, to provide a robust, end-to-end solution for managing and scaling large models. vllm-plugin-fl is a vLLM plugin built on the FlagOS unified multi-chip backend, to help flagscale support multi-chip on vllm framework.

FlagCX

FlagCX is a scalable and adaptive cross-chip communication library. It serves as a platform where developers, researchers, and AI engineers can collaborate on various projects, contribute to the development of cutting-edge AI solutions, and share their work with the global community.

FlagEval Evaluation Framework

FlagEval is a comprehensive evaluation system and open platform for large models launched in 2023. It aims to establish scientific, fair, and open benchmarks, methodologies, and tools to help researchers assess model and training algorithm performance. It features:

• Multi-dimensional Evaluation: Supports 800+ modelevaluations across NLP, CV, Audio, and Multimodal fields,covering 20+ downstream tasks including language understanding and image-text generation.
• Industry-Grade Use Cases: Has completed horizonta1 evaluations of mainstream large models, providing authoritative benchmarks for chip-model performance validation.

Contributing

We warmly welcome global developers to join us:

1. Submit Issues to report problems
2. Create Pull Requests to contribute code
3. Improve technical documentation
4. Expand hardware adaptation support

License

The model weights are derived from moonshotai/Kimi-Linear-48B-A3B-Instruct and are open‑sourced under the Apache License 2.0: https://www.apache.org/licenses/LICENSE-2.0.txt