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Open-weight model · Reinforcement learning

Qwen3-4B-tau2-grpo-retail-2ep-lr1e6

by MinseokKang MANGSEOK123/Qwen3-4B-tau2-grpo-retail-2ep-lr1e6

Qwen3-4B-tau2-grpo-retail-2ep-lr1e6 is an open-weight model for reinforcement learning from MinseokKang, released under Apache License 2.0. It has 4.4B parameters and a 262,144-token context. At 16-bit it needs about 10.6 GB of GPU memory, which fits on 1x MI300X from $1.85 an hour, at the lowest prices in the SAVRN Index.

Trained on the retail domain of tau2-bench alone rather than on airline+retail jointly, completing a four-way sweep (plain/memory x airline/retail).

Parameters4.4B
Context262,144
Weights8.8 GB
Licenseapache-2.0
AccessOpen weights
Monthly Downloads—

Runs On

What it takes to serve Qwen3-4B-tau2-grpo-retail-2ep-lr1e6 (4.4B parameters): the memory its weights need at each precision, and the cheapest way to rent enough data-center GPUs to hold them.

PrecisionWeightsMemory neededCheapest setupPer hourAlso fits
16-bit 8.8 GB 10.6 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 4.4 GB 5.3 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 2.2 GB 2.6 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00

Memory is the weights at that precision plus 20% for the runtime and a short context; a long context needs more. Prices are the lowest on-demand hourly rates in the SAVRN Index, read Oct 19, 2026.

Qwen3-4B-tau2-grpo-retail-2ep-lr1e6 on every accelerator the SAVRN Index prices, at every precision

Model Card

By MinseokKang, published under apache-2.0, revision 3eb7982d033d.

Trained on the retail domain of tau2-bench alone rather than on airline+retail jointly, completing a four-way sweep (plain/memory x airline/retail). On retail the memory-augmented variant is the stronger of the two at this budget (avg@3 0.558 vs 0.492, pass^3 0.475 vs 0.350), and that ordering also held under joint training. Joint training carried to 5 epochs reached avg@3 0.592 (memory) and 0.558 (plain), so epoch count mattered more than domain separation here. Numbers use a 60-hop episode cap rather than tau2's 200-hop default, so they are not comparable to the public leaderboard.

Read MinseokKang's full model card

Qwen3-4B-Instruct-2507 · tau2-bench plain GRPO, retail only (2 epochs)

Trained on the retail domain of tau2-bench alone rather than on airline+retail jointly, completing a four-way sweep (plain/memory x airline/retail).

Base model Qwen/Qwen3-4B-Instruct-2507
Algorithm GRPO, KL loss 0.01, lr 1e-6 constant
Steps 8 (= 2 epochs)
Batch 8 tasks x 8 rollouts = 64 episodes/step
Episode budget 60 tau2 hops (~30 agent turns)
User simulator gpt-4.1-2025-04-14
Hardware 8x RTX A5000 24GB, FSDP + CPU offload, Ulysses SP=2

Results — tau2 retail test split, 3 trials, 60-hop cap

pass@3 avg@3 pass^3
base 0.775 0.575 0.400
this model 0.625 0.492 0.350
memory GRPO, retail only 0.650 0.558 0.475

On retail the memory-augmented variant is the stronger of the two at this budget (avg@3 0.558 vs 0.492, pass^3 0.475 vs 0.350), and that ordering also held under joint training. Joint training carried to 5 epochs reached avg@3 0.592 (memory) and 0.558 (plain), so epoch count mattered more than domain separation here.

Numbers use a 60-hop episode cap rather than tau2's 200-hop default, so they are not comparable to the public leaderboard.

Configuration

Architecture
Qwen3ForCausalLM
Context length (tokens)
262,144
Layers
36
Hidden size
2,560
Feed-forward size
9,728
Attention heads
32
Key/value heads
8
Head dimension
128
Vocabulary size
151,936
RoPE base
5,000,000
Stored precision
bfloat16
Model type
qwen3

Identity and Version

Repository
MANGSEOK123/Qwen3-4B-tau2-grpo-retail-2ep-lr1e6
Publisher
MinseokKang
Task
Reinforcement learning
Modality
Control
Library
transformers
Parameters
4.4B parameters
Languages
Not stated by the source
Revision
3eb7982d033d801efc1962563021863213d54db1
First published
2026-09-20
Last updated
2026-09-20

Files and Weights

13 files, 8.8 GB in total. The weights are 2 files totalling 8.8 GB in safetensors.

Weights2 files · 8.8 GB
Configuration5 files · 35.1 KB
Tokenizer4 files · 15.9 MB
Documentation1 file · 1.5 KB
Repository1 file · 1.6 KB
Every file
FileTypeSizeSHA-256
model-00001-of-00002.safetensorsWeights5.0 GB 8e8b32eb1403
model-00002-of-00002.safetensorsWeights3.8 GB 7a1674ec0d4f
added_tokens.jsonConfiguration707 B —
config.jsonConfiguration728 B —
generation_config.jsonConfiguration213 B —
model.safetensors.index.jsonConfiguration32.9 KB —
special_tokens_map.jsonConfiguration613 B —
README.mdDocumentation1.5 KB —
.gitattributesRepository1.6 KB —
merges.txtTokenizer1.7 MB —
tokenizer.jsonTokenizer11.4 MB aeb13307a71a
tokenizer_config.jsonTokenizer8.2 KB —
vocab.jsonTokenizer2.8 MB —

License and Download

License
apache-2.0
Access
Open weights, no gate
Download size
8.8 GB
Download from MinseokKang

Released by MinseokKang through its official repository on Hugging Face. Read the license.

Built From

Memory Requirements

PrecisionWeights in memory
As published8.8 GB
16-bit8.8 GB
8-bit4.4 GB
4-bit2.2 GB

Weights only, from the published parameter count; the key-value cache and runtime add to this.

Questions About Qwen3-4B-tau2-grpo-retail-2ep-lr1e6

How much GPU memory does Qwen3-4B-tau2-grpo-retail-2ep-lr1e6 need?

About 10.6 GB at 16-bit and 2.6 GB at 4-bit: the weights (4.4B parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run Qwen3-4B-tau2-grpo-retail-2ep-lr1e6 on?

At 16-bit, 1x MI300X from $1.85 an hour; at 4-bit, 1x MI300X from $1.85 an hour, at the lowest on-demand prices the SAVRN Index lists.

Can I use Qwen3-4B-tau2-grpo-retail-2ep-lr1e6 commercially?

Yes. Qwen3-4B-tau2-grpo-retail-2ep-lr1e6 is released under Apache License 2.0. The Apache License 2.0 is a permissive open-source license. It permits commercial use, modification and redistribution. It requires keeping the license and copyright notices and any NOTICE file, stating significant changes, and it includes an express patent grant from contributors.

What is Qwen3-4B-tau2-grpo-retail-2ep-lr1e6's context length?

262,144 tokens, from the maximum position embeddings in its published configuration.

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