Chronos-Bolt (Small)

Chronos-Bolt Small is Amazon's fast zero-shot forecasting checkpoint built for production use, at 48M parameters. It is positioned as a strong default in the Chronos-Bolt family: probabilistic forecasts with low latency and a simpler deployment footprint than the original Chronos line.

It uses a patch-based T5 encoder-decoder and replaces autoregressive token-by-token rollout with direct multi-step quantile prediction over patchified history. Forecasting the entire horizon in one pass is what makes Bolt materially faster and lighter than the first Chronos generation. It is pretrained on nearly 100B time-series observations drawn from large public corpora and synthetic pretraining data, as documented by the official Chronos-Bolt model cards.

On TSFM.ai, Small is the natural starting point when you want quick, high-throughput quantile forecasts without hand-tuning a model choice. Drop to Chronos-Bolt Mini or Tiny when cost and latency dominate, climb to Chronos-Bolt Base when you want a higher quality ceiling, and switch to Chronos-2 when you need covariates or multivariate cross-learning beyond fast univariate forecasting.