Hy-Memory

Model Introduction

Hy-Memory-30B-A3B is a compact long-term-memory writer model (~3B active parameters) developed by Tencent Hunyuan to execute the write path inside external memory frameworks. It directly replaces the general-purpose LLM inside Mem0, MemOS, and Hy-Memory (covering Chat, Working, and Coding scenarios), deciding what information to retain, how precisely to represent it, and how new evidence should update the persistent memory bank. The model is trained in two stages—Memory On-Policy Distillation (OPD) followed by Attributed Memory Reinforcement Learning—and transfers directly to unseen memory frameworks such as EverMemOS.

Two-Stage Training

Experiments

Evaluation Principles

The evaluation changes only the memory writer. For each comparison, the harness version and prompts are fixed, retrieval configuration is fixed, and the answer model, judge, and other framework-side components are held fixed. Throughout this report, every reference to a DeepSeek Flash endpoint denotes DeepSeek V4.1 Flash. Decoding settings are matched where APIs permit, each writer builds its own bank from an empty state, and test examples and scoring rules are identical.

For computational efficiency, every benchmark in the main four-harness matrix is evaluated on a fixed 20% subsample. Each harness score is the equal-weight average of six metrics: LoCoMo Judge, LongMemEval (LME), PersonaMem-v2 (PM-v2), Travel SPS, Shopping PS, and Code Memory Bench (CMB). CMB is itself the equal-weight average of two repository QA evaluations. The overall score is the equal-weight average of the four harness scores.

Final Cross-Harness Results

Table 1: Six-metric means on fixed 20% benchmark subsamples. The macro average weights the four harnesses equally.

Detailed Benchmark Results

Tables 2–5 report the six benchmark scores used to compute each harness mean in Table 1 on the same fixed 20% benchmark subsamples.

Table 2: Detailed results on the Mem0 harness

Table 3: Detailed results on the Hy-Memory harness

Table 4: Detailed results on the MemOS harness

Table 5: Detailed results on the held-out EverMemOS harness

Quickstart

Deploy the model with vLLM (tested with v0.31.0) using --served-model-name hy-memory, then call the OpenAI-compatible API. The example below extracts user facts and preferences with no-think mode enabled.

from openai import OpenAI

client = OpenAI(
    base_url="http://127.0.0.1:8000/v1",
    api_key="EMPTY",
)

response = client.chat.completions.create(
    model="hy-memory",
    messages=[
        {
            "role": "system",
            "content": (
                "Extract explicit