SAVRN
Search Contact SAVRN

Open-weight model · Text classification

Firebird-ModernBERT-512-RW

by Noumenon, Inc. noumenon-labs/Firebird-ModernBERT-512-RW

Firebird-ModernBERT-512-RW is an experimental post-trained variant of It is a ~149M parameter ModernBERT binary classifier for distinguishing: - 0 — HUMAN The maximum sequence length is 512 tokens.

Parameters150M
Context8,192
Weights299.2 MB
License
AccessOpen weights
Monthly Downloads

Runs On

What it takes to serve Firebird-ModernBERT-512-RW (150M 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 0.3 GB 0.4 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 0.1 GB 0.2 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 0.1 GB 0.1 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 Sep 18, 2026.

Model Card

Firebird-ModernBERT-512-RW is an experimental post-trained variant of It is a ~149M parameter ModernBERT binary classifier for distinguishing: - 0 — HUMAN The maximum sequence length is 512 tokens. This checkpoint was produced through reward-weighted classifier post-training. The original Firebird checkpoint was kept frozen as a reference model. Training examples were scored by the original classifier, difficult examples received larger loss weights, and the post-trained model was constrained against the frozen reference using a KL penalty. L = weightedcrossentropy + beta KL(reference || policy) Hard human examples received greater weighting than ordinary examples because one goal of the…

Excerpt from the card by Noumenon, Inc..

Configuration

Architecture
ModernBertForSequenceClassification
Context length (tokens)
8,192
Layers
22
Hidden size
768
Feed-forward size
1,152
Attention heads
12
Vocabulary size
50,368
Model type
modernbert

Identity and Version

Repository
noumenon-labs/Firebird-ModernBERT-512-RW
Publisher
Noumenon, Inc.
Task
Text classification
Modality
Text
Library
transformers
Parameters
150M parameters
Languages
en
Revision
34cd35868b31c3be5fdaeb192e0b8804f517ccc9
First published
2026-09-18
Last updated
2026-09-18

Files and Weights

11 files, 302.8 MB in total. The weights are 2 files totalling 299.2 MB in bin, safetensors.

Weights2 files · 299.2 MB
Configuration5 files · 16.8 KB
Tokenizer2 files · 3.6 MB
Documentation1 file · 8.6 KB
Repository1 file · 1.5 KB
Every file
FileTypeSizeSHA-256
model.safetensorsWeights299.2 MB c1942d4c2e8e
training_args.binWeights5.2 KB 9b2ebf7fcb6a
config.jsonConfiguration2.1 KB
experiment_exp001.jsonConfiguration2.4 KB
experiment_results.jsonConfiguration2.0 KB
inference_config.jsonConfiguration218 B
trainer_log_history.jsonConfiguration10.2 KB
README.mdDocumentation8.6 KB
.gitattributesRepository1.5 KB
tokenizer.jsonTokenizer3.6 MB
tokenizer_config.jsonTokenizer379 B

License and Download

License
Not stated by the source
Access
Open weights, no gate
Download size
299.2 MB
Download from Noumenon, Inc.

Released by Noumenon, Inc. through its official repository on Hugging Face.

Built From

Memory Requirements

PrecisionWeights in memory
As published299.2 MB
16-bit0.3 GB
8-bit0.1 GB
4-bit0.1 GB

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

Questions About Firebird-ModernBERT-512-RW

How much GPU memory does Firebird-ModernBERT-512-RW need?

About 0.4 GB at 16-bit and 0.1 GB at 4-bit: the weights (150M parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run Firebird-ModernBERT-512-RW 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.

What is Firebird-ModernBERT-512-RW's context length?

8,192 tokens, from the maximum position embeddings in its published configuration.

Similar Models

This model is distilled from the zero-shot classification pipeline on the Multilingual Sentiment dataset using this script. In reality the multilingual-sentiment dataset is annotated of course, but we'll pretend and ignore the annotations for the sake of example. Result can be reproduce using the following commands: If you are training this model on Colab, make the following code changes to avoid Out-of-memory error message: - Transformers 4.28.1 - Pytorch 2.0.0+cu118 - Datasets 2.11.0 - Tokenizers 0.13.3

Open weights apache-2.0 135M parameters 512 tokens transformers

Model · Text classification

turn-detector

LiveKit

An open-weights language model for contextually-aware end-of-utterance (EOU) detection in voice AI applications. The model predicts whether a user has finished speaking based on the semantic content of their transcribed speech, providing a critical complement to voice activity detection (VAD) systems. Traditional voice agents rely on voice activity detection (VAD) to determine when a user has finished speaking. VAD works by detecting the presence or absence of speech in an audio signal and applying a silence timer. While effective for detecting pauses, VAD lacks language understanding and frequently causes false positives. For example, a user who says "I need to think about that for a…

Open weights other 135M parameters 8,192 tokens transformers

Model · Text classification

bert-base-multilingual-uncased-sentiment

NLP Town

Visit the NLP Town website for an updated version of this model, with a 40% error reduction on product reviews. This is a bert-base-multilingual-uncased model finetuned for sentiment analysis on product reviews in six languages: English, Dutch, German, French, Spanish, and Italian. It predicts the sentiment of the review as a number of stars (between 1 and 5). This model is intended for direct use as a sentiment analysis model for product reviews in any of the six languages above or for further finetuning on related sentiment analysis tasks. Here is the number of product reviews we used for finetuning the model: The fine-tuned model obtained the following accuracy on 5,000 held-out product…

Open weights mit 167M parameters 512 tokens transformers

Model · Text classification

roberta-base-go_emotions

Sam Lowe

Model trained from roberta-base on the goemotions dataset for multi-label classification. A version of this model in ONNX format (including an INT8 quantized ONNX version) is now available at https://huggingface.co/SamLowe/roberta-base-goemotions-onnx. These are faster for inference, esp for smaller batch sizes, massively reduce the size of the dependencies required for inference, make inference of the model more multi-platform, and in the case of the quantized version reduce the model file/download size by 75% whilst retaining almost all the accuracy if you only need inference. goemotions is based on Reddit data and has 28 labels. It is a multi-label dataset where one or multiple labels…

Open weights mit 125M parameters 514 tokens transformers

Model · Text classification

cryptobert

Mikolaj Kulakowski

For academic reference, cite the following paper: https://ieeexplore.ieee.org/document/10223689 CryptoBERT is a pre-trained NLP model to analyse the language and sentiments of cryptocurrency-related social media posts and messages. It was built by further training the vinai's bertweet-base language model on the cryptocurrency domain, using a corpus of over 3.2M unique cryptocurrency-related social media posts. (A research paper with more details will follow soon.) The model was trained on the following labels: "Bearish": 0, "Neutral": 1, "Bullish": 2 CryptoBERT's sentiment classification head was fine-tuned on a balanced dataset of 2M labelled StockTwits posts, sampled from…

Open weights mit 125M parameters 514 tokens transformers

Model · Text classification

deberta-v3-base-prompt-injection-v2

Protect AI

This model is a fine-tuned version of microsoft/deberta-v3-base specifically developed to detect and classify prompt injection attacks which can manipulate language models into producing unintended outputs. Prompt injection attacks manipulate language models by inserting or altering prompts to trigger harmful or unintended responses. The deberta-v3-base-prompt-injection-v2 model is designed to enhance security in language model applications by detecting these malicious interventions. This model classifies inputs into benign (0) and injection-detected (1). deberta-v3-base-prompt-injection-v2 is highly accurate in identifying prompt injections in English. It does not detect jailbreak attacks…

Open weights apache-2.0 184M parameters 512 tokens transformers