SAVRN
Search Contact SAVRN

Open-weight model · Time series forecasting

chronos-bolt-base

by Amazon amazon/chronos-bolt-base

Update Feb 14, 2025: Chronos-Bolt models are now available on Amazon SageMaker JumpStart! Check out the tutorial notebook to learn how to deploy Chronos endpoints for production use in a few lines of code.

Parameters205M
Context
Weights821.2 MB
Licenseapache-2.0
AccessOpen weights
Monthly Downloads1.2M

Runs On

What it takes to serve chronos-bolt-base (205M 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 0.4 GB 0.5 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 0.2 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.

SAVRN's Notes on chronos-bolt-base

Not everything worth hosting is a language model. This one chunks a history of numbers into patches and returns a forecast with no fine tuning, trained on nearly 100 billion observations on a T5 encoder-decoder. At 205 million parameters it needs 0.4 gigabytes of weights and 0.5 gigabytes of memory at 16-bit. The Index names a 192 gigabyte MI300X at $1.85 an hour as the cheapest host, but this belongs on a card already doing other work.

Apache 2.0 covers it: commercial use, modification and redistribution, if you keep the license and NOTICE files and state significant changes. Access is open. Before committing, read the two papers it is described by, arXiv 1910.10683 for T5 and arXiv 2403.07815 for Chronos, and note the float32 storage, so the 0.8 gigabyte download exceeds the 16-bit footprint. No context length is on the record, so test the history window against your own series.

Model Card

By Amazon, published under apache-2.0, revision 5d9f166d69f4.

Update Feb 14, 2025: Chronos-Bolt models are now available on Amazon SageMaker JumpStart! Check out the tutorial notebook to learn how to deploy Chronos endpoints for production use in a few lines of code.

Chronos-Bolt is a family of pretrained time series forecasting models which can be used for zero-shot forecasting. It is based on the T5 encoder-decoder architecture and has been trained on nearly 100 billion time series observations. It chunks the historical time series context into patches of multiple observations, which are then input into the encoder. The decoder then uses these representations to directly generate quantile forecasts across multiple future steps—a method known as direct multi-step forecasting. Chronos-Bolt models are up to 250 times faster and 20 times more memory-efficient than the original Chronos models of the same size.

Performance

Read the full model card (835 words)

Configuration

Architecture
ChronosBoltModelForForecasting
Vocabulary size
2
Stored precision
float32
Model type
t5

Identity and Version

Repository
amazon/chronos-bolt-base
Publisher
Amazon
Task
Time series forecasting
Modality
Time series
Library
chronos-forecasting
Parameters
205M parameters
Languages
Not stated by the source
Revision
5d9f166d69f47aef3401367a7b842e78fe97b121
First published
2024-11-25
Last updated
2025-11-21

Files and Weights

4 files, 821.2 MB in total. The weights are 1 file totalling 821.2 MB in safetensors.

Weights1 file · 821.2 MB
Configuration1 file · 1.1 KB
Documentation1 file · 8.7 KB
Repository1 file · 1.5 KB
Every file
FileTypeSizeSHA-256
model.safetensorsWeights821.2 MB 31f875483a32
config.jsonConfiguration1.1 KB
README.mdDocumentation8.7 KB
.gitattributesRepository1.5 KB

License and Download

License
apache-2.0
Access
Open weights, no gate
Download size
821.2 MB
Download from Amazon

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

Built From

Memory Requirements

PrecisionWeights in memory
As published821.2 MB
16-bit0.4 GB
8-bit0.2 GB
4-bit0.1 GB

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

Questions About chronos-bolt-base

How much GPU memory does chronos-bolt-base need?

About 0.5 GB at 16-bit and 0.1 GB at 4-bit: the weights (205M parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run chronos-bolt-base 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 chronos-bolt-base commercially?

Yes. chronos-bolt-base 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.

Similar Models

Model · Time series forecasting

chronos-bolt-base

Autogluon

Update Feb 14, 2025: Chronos-Bolt models are now available on Amazon SageMaker JumpStart! Check out the tutorial notebook to learn how to deploy Chronos endpoints for production use in a few lines of code. Chronos-Bolt is a family of pretrained time series forecasting models which can be used for zero-shot forecasting. It is based on the T5 encoder-decoder architecture and has been trained on nearly 100 billion time series observations. It chunks the historical time series context into patches of multiple observations, which are then input into the encoder. The decoder then uses these representations to directly generate quantile forecasts across multiple future steps—a method known as…

Open weights apache-2.0 205M parameters

Model · Time series forecasting

chronos-t5-base

Amazon

Update Feb 14, 2025: Chronos-Bolt & original Chronos models are now available on Amazon SageMaker JumpStart! Check out the tutorial notebook to learn how to deploy Chronos endpoints for production use in a few lines of code. Update Nov 27, 2024: We have released Chronos-Bolt models that are more accurate (5% lower error), up to 250 times faster and 20 times more memory-efficient than the original Chronos models of the same size. Check out the new models here. Chronos is a family of pretrained time series forecasting models based on language model architectures. A time series is transformed into a sequence of tokens via scaling and quantization, and a language model is trained on these…

Open weights apache-2.0 201M parameters chronos-forecasting

Model · Time series forecasting

chronos-t5-base

Autogluon

Update Feb 14, 2025: Chronos-Bolt & original Chronos models are now available on Amazon SageMaker JumpStart! Check out the tutorial notebook to learn how to deploy Chronos endpoints for production use in a few lines of code. Update Nov 27, 2024: We have released Chronos-Bolt models that are more accurate (5% lower error), up to 250 times faster and 20 times more memory-efficient than the original Chronos models of the same size. Check out the new models here. Chronos is a family of pretrained time series forecasting models based on language model architectures. A time series is transformed into a sequence of tokens via scaling and quantization, and a language model is trained on these…

Open weights apache-2.0 201M parameters transformers

Model · Time series forecasting

Aurora

DI DaSE ECNU

alt="Aurora Logo" src="https://cdn-uploads.huggingface.co/production/uploads/66276727368ec2a0b933772c/ytpsIAr98keUvNouoOVmb.png" width="30%" The official code repo of our ICLR 2026 paper: Aurora: Towards Universal Generative Multimodal Time Series Forecasting alt="ICLR 2026" src="https://img.shields.io/badge/ICLR%202026-Aurora-orange" alt="Python" src="https://img.shields.io/badge/Python-3.10%2B-blue" alt="PyTorch" src="https://img.shields.io/badge/PyTorch-2.4.1-blue" alt="GitHub Stars" src="https://img.shields.io/github/stars/decisionintelligence/Aurora?logo=github" alt="GitHub" src="https://img.shields.io/badge/GitHub-Aurora-black?logo=github" Aurora is a highly capable multimodal time…

Open weights mit 211M parameters 10,000 tokens

Model · Time series forecasting

timesfm-2.5-200m-pytorch

Google

TimesFM (Time Series Foundation Model) is a pretrained time-series foundation model developed by Google Research for time-series forecasting. Please reinstall the latest version of the timesfm package to reflect these changes. Results should be unchanged. This checkpoint is not an officially supported Google product. See TimesFM in BigQuery for Google official support. timesfm-2.5-200m is the third open model checkpoint. timesfm-2.5-200m is pretrained using - Wikimedia Pageviews, cutoff Nov 2023 (see paper for details). - Google Trends top queries, cutoff EoY 2022 (see paper for details). - Synthetic and augmented data. At this point, please run

Open weights apache-2.0 231M parameters timesfm

Model · Time series forecasting

timesfm-2.5-200m-transformers

Google

TimesFM (Time Series Foundation Model) is a pretrained decoder-only model for time-series forecasting. This repository contains the Transformers port of the official TimesFM 2.5 PyTorch release. This model is converted from the official TimesFM 2.5 PyTorch checkpoint and integrated into transformers as TimesFm25ModelForPrediction. The converted checkpoint preserves the original architecture and forecasting behavior, including: patch-based inputs for time-series contexts decoder-only self-attention stack point and quantile forecasts Weight conversion parity is verified by comparing converted-model forecasts against the official implementation outputs on deterministic inputs.

Open weights apache-2.0 231M parameters 16,384 tokens transformers