Model release

Palmyra-mini-thinking-b

Palmyra-mini-thinking-b is an open-weight model release in the Palmyra family from Writer1 2, version palmyra-mini-thinking-b, released Sep 11, 2025. Its weights can be downloaded by the public1 3 under the Apache License 2.01.

A small reasoning model in Writer's Palmyra-mini family, released in September 2025. Writer built it on NVIDIA's OpenReasoning-Nemotron-1.5B and applied reinforcement-learning fine-tuning; the model card lists a 131,072-token context window.1 2

Model hub: Model card (Hugging Face) (external site: huggingface.co)
Model hub: GGUF build (external site: huggingface.co)
Model hub: MLX build (external site: huggingface.co)
Release notes: Palmyra-mini announcement (Hugging Face blog) (external site: huggingface.co)

On AI on Hugging Face: Writer/palmyra-mini-thinking-b, Writer/palmyra-mini-thinking-b-GGUF, Writer/palmyra-mini-thinking-b-MLX-BF16

Last reviewedSep 29, 2026Entry updated Sep 29, 2026Documented release Sep 11, 2025

Availability and license

Overall availability

Public

Downloadable from Hugging Face without gating.1

Availability fact review: not separately recorded

Availability is separate from permission: read the license before using or redistributing.

Apache License 2.0 (external site: huggingface.co)1
Applies to: Weights · SPDX Apache-2.0 · on the rubric’s OSI-approved software-license list · fact-level rights review not recorded
Plain-language guide to the Apache License 2.0

Writer's card lists Apache 2.0 and does not mention the base model's license. NVIDIA's card for the base model, OpenReasoning-Nemotron-1.5B, says its use is governed by the Creative Commons Attribution 4.0 license (CC-BY-4.0) and links the Apache 2.0 license from a Qwen repository as additional information. The two licenses differ, and Writer's card does not explain how the base model's CC-BY-4.0 terms apply.1 4

Component reuse rights

A readable or downloadable component is not automatically reusable. These indicators concern recorded license evidence, not system certification.

weights: Unknown — no complete fact-level rights review
code: Unknown — no complete fact-level rights review
data: Unknown — no complete fact-level rights review
documentation: Unknown — no complete fact-level rights review

No complete system-rights review is recorded for this release.

Model-disclosure tier

Computed from the checklist below using USASI rubric v0.2. An editorial category, not a certification.

Open-weight

The model parameters for this release can be downloaded by the public. License terms may still restrict use, redistribution, or commercial use.

How tiers are computed

Public materials checklist

Items for a model under USASI rubric v0.2. Unknown means unassessed or insufficient evidence.

Public materials checklist for Palmyra-mini-thinking-b
Item	Status	Notes and evidence
WeightsCan the general public download the model parameters for this release?	Public	Writer also publishes GGUF and MLX conversions.1 3
Inference codeIs code for running the model published?	Public	The card documents inference with Hugging Face Transformers and serving with vLLM.1
Training codeIs the code used to train the model published?	Unknown	Not assessed.
Training-data informationDoes the information cover provenance, scope, acquisition, selection, labeling, processing, and where data or alternatives can be obtained? Access alone does not establish completeness.	Unknown	Not assessed.
Training-data accessCan the training data be obtained? This is independent of information completeness and reuse rights; original unshareable data need not be downloadable.	Unknown	Not assessed.
Complete training pipelineIs the complete base-training and preprocessing pipeline published, including configuration? Fine-tuning code or an inference SDK alone is insufficient.	Unknown	Not assessed.
Legacy data assessment (v0.1)Historical assessment combining download access and disclosure. Preserved for traceability; excluded from the v0.2 tier calculation. See the new separate assessments above.	Unknown	Neither the model card nor Writer's announcement names the fine-tuning data.1 2
Training recipeAre the training configuration and procedure documented in enough detail to follow?	Partial	Writer's announcement says the thinking models were trained with a chain-of-thought approach and that this model received reinforcement-learning fine-tuning; no further detail is given.2
Evaluation materialsPublic = evaluation code or prompts that let others re-run the evaluations are published. Partial = results only.	Partial	The card publishes benchmark scores and names the tools used (lm_eval, lighteval, and nemoskills) without publishing evaluation configurations.1

What it is useful for

Writer describes it as the Palmyra-mini variant aimed at mathematical reasoning; the card also highlights competitive programming problems.2 1

Organization context

Writer

Provenance and derivatives

Fine-tuned by Writer from NVIDIA's OpenReasoning-Nemotron-1.5B. NVIDIA's card says that model was developed from Qwen2.5-1.5B (Alibaba Cloud's Qwen family) and post-trained on responses generated by DeepSeek-R1-0528.1 4 7

Derived from: OpenReasoning-Nemotron-1.5B (external site: huggingface.co) — Direct base model (NVIDIA).
Derived from: Qwen2.5-1.5B (external site: huggingface.co) — Base of OpenReasoning-Nemotron-1.5B.

Other releases in the Palmyra family

Palmyra-miniModel-disclosure tier (USASI rubric v0.2): Open-weight

Palmyra family overview

What this catalog does not know

Unknown means the sources reviewed for this record do not document it. It is not evidence that something does not exist.

Training code: unknown.
Training-data information: unknown.
Training-data access: unknown.
Complete training pipeline: unknown.
Legacy data assessment (v0.1): unknown.

Have a primary source? How to report a correction.

U.S. eligibility

Project eligibility rests on documented governing or maintaining entities, not on contributors.

Eligible · basis: U.S. headquarters

Published by Writer, Inc., which is headquartered in San Francisco per its company page and platform services agreement. Its base model is NVIDIA's OpenReasoning-Nemotron-1.5B, which NVIDIA's card describes as a derivative of Qwen2.5-1.5B from Alibaba Cloud's Qwen family; eligibility here rests on Writer as the developer of this fine-tune.1 5 6 4 7

Assessed Sep 29, 2026

Sources

1.
Writer/palmyra-mini-thinking-b model card (external site: huggingface.co)
Writer · Model card · accessed Sep 29, 2026
2.
Introducing the Palmyra-mini family: Powerful, lightweight, and ready to reason! (external site: huggingface.co)
Writer · Announcement · published Sep 11, 2025 · accessed Sep 29, 2026
3.
Writer on Hugging Face (external site: huggingface.co)
Writer · Repository · accessed Sep 29, 2026
4.
nvidia/OpenReasoning-Nemotron-1.5B model card (external site: huggingface.co)
NVIDIA · Model card · accessed Sep 29, 2026
5.
Company | WRITER (external site: writer.com)
Writer · Official page · accessed Sep 29, 2026
6.
Writer platform services agreement (external site: writer.com)
Writer, Inc. · Official page · published Aug 5, 2026 · accessed Sep 29, 2026
7.
Qwen on Hugging Face (external site: huggingface.co)
Qwen (Alibaba Cloud) · Repository · accessed Sep 29, 2026

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Cite this page

APA style

USASI. (2026, September 29). Palmyra-mini-thinking-b. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/open/palmyra-mini-thinking-b/

BibTeX

@misc{usasi_palmyra_mini_thinking_b,
  author = {{USASI}},
  title = {Palmyra-mini-thinking-b},
  year = {2026},
  month = sep,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/open/palmyra-mini-thinking-b/}},
  note = {United States of America Superintelligence. Last updated 2026-09-29}
}

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