physics-r1-seed42-v4-step60

Physics-R1 — Seed 42, v4 step-60 (HF safetensors)

Project Page | Paper | Code | Training corpus

The Physics-R1 paper checkpoint for the Physics-R1 (binary, seed 42) row of Table 2 — single-seed paper headline. Fine-tune of Qwen3-VL-8B-Thinking on the audited PhysR1Corp (2,268 closed-form physics problems) via full-parameter FSDP1 GRPO with binary correctness reward.

This is the easy-to-use HF safetensors release. For the original verl FSDP-sharded archive (for training-state inspection or further RL), see physics-r1-seed42-v4-step60-fsdp.

Quickstart

from transformers import AutoModelForImageTextToText, AutoProcessor
import torch

model = AutoModelForImageTextToText.from_pretrained(
    "shanyangmie/physics-r1-seed42-v4-step60",
    dtype=torch.bfloat16,
    device_map="auto",
    trust_remote_code=True,
)
processor = AutoProcessor.from_pretrained(
    "shanyangmie/physics-r1-seed42-v4-step60",
    trust_remote_code=True,
)

For evaluation against the paper's benchmark, see PhysOlym-A and the code release.

Performance (paper Table 2, seed-42 row)

Scoring: problem-level liberal Sonnet-as-judge (every subpart of a multi-part problem must be correct). The 3-seed mean across {42, 17, 23} is the paper's headline (+18.9 pp on PhysOlym-A).

Other seeds (HF safetensors mirrors)

Training recipe

• Base model: Qwen/Qwen3-VL-8B-Thinking
• Algorithm: GRPO (verl 0.6.1, full-parameter FSDP1 — actor.strategy=fsdp, not fsdp2)
• Reward: binary correctness, per-subpart Sonnet judge with problem-level AND aggregation (see paper §3.2)
• Data: shanyangmie/physr1corp — 2,268 audited closed-form problems
• Seed / step: 42 / 60
• Hardware: 4×H200 (FSDP1 4-way sharded)

Full hyperparameters in paper Appendix.

License

Apache 2.0, inheriting from the base model Qwen3-VL-8B-Thinking. Training data (physr1corp) is CC BY-NC 4.0, so this derivative checkpoint is intended for non-commercial research use.

Citation

@misc{yang2026physicsr1,
  title  = {Physics-R1: An Audited Olympiad Corpus and Recipe for Visual Physics Reasoning},
  author = {Yang, Shan},
  year   = {2026},
  url    = {https://huggingface.co/papers/2605.14040}
}