KeyError: 'rope_parameters_factor' when using convert_gpt_oss_weights_to_hf.py for openai/gpt-oss-20b

[shubhagr-qc]

System Info

Transformer is on commit 64397a8 of main branch.
Latest as of Nov 4 2025

Who can help?

@zucchini-nlp
PR Introducing the key in the convert file is #39847
Can you please help with this issue.

Information

• The official example scripts
• My own modified scripts

Tasks

• An officially supported task in the examples folder (such as GLUE/SQuAD, ...)
• My own task or dataset (give details below)

Reproduction

Steps to reproduce the error:

1. huggingface-cli download openai/gpt-oss-20b
2. git clone https://github.com/huggingface/transformers.git
3. cd transformers
4. pip install -e .
5. cd src/transformers/models/gpt_oss
6. python convert_gpt_oss_weights_to_hf.py --input_dir modelsopenai-gpt-oss-20b/snapshots/2e8f8052ee2aeee907f76e08c08b9fdde8677ca8/original/ --output_dir ./gpt_oss_20b_fp16

Error:
Traceback (most recent call last):
File "transformers/src/transformers/models/gpt_oss/convert_gpt_oss_weights_to_hf.py", line 831, in
main()
File "transformers/src/transformers/models/gpt_oss/convert_gpt_oss_weights_to_hf.py", line 815, in main
write_model(
File "transformers/src/transformers/models/gpt_oss/convert_gpt_oss_weights_to_hf.py", line 163, in write_model
"factor": float(original_config.pop("rope_parameters_factor")),
KeyError: 'rope_parameters_factor'

Expected behavior

Expected it to complete successfully which is still happening if I revert the mentioned commit.